Journal articles: 'Wind-pressure Measurement'

1

Liang, Shu Guo, Xiao Hui Peng, and Lei Wang. "Comparative Study between Field Measurement and Wind Tunnel Test of Wind Pressure on Wuhan International Stock Building." Applied Mechanics and Materials 590 (June 2014): 341–48. http://dx.doi.org/10.4028/www.scientific.net/amm.590.341.

Full text

Abstract:

Field measurement and wind tunnel test of wind pressure on the surfaces of Wuhan International Stock Building were carried out in this paper, and the mean wind pressure coefficients, RMS wind pressure coefficients, wind pressure spectra as well as coherence functions were discussed. Meanwhile wind pressure distributions were analyzed. The results demonstrated that the distribution of the surface mean wind pressure coefficients obtained by wind tunnel test approximately agreed with that by field measurement, especially the mean wind pressure coefficients on the windward obtained by the wind tunnel test fitted those obtained by the field measurement well, while the RMS wind pressure coefficients of the wind tunnel results are smaller than those of field measurement, and the RMS wind pressure coefficients of some measure points of field measurement fluctuated greatly.

APA, Harvard, Vancouver, ISO, and other styles

2

Kolbe, Sven, Manuel Mohr, Martin Maier, Laurin Osterholt, Barry Gardiner, and Dirk Schindler. "On the Potential of Using Air Pressure Fluctuations to Estimate Wind-Induced Tree Motion in a Planted Scots Pine Forest." Forests 13, no. 2 (February 2, 2022): 225. http://dx.doi.org/10.3390/f13020225.

Full text

Abstract:

This paper reports statistical relationships between measured airflow, air pressure fluctuations, and the wind-induced motion of planted Scots pine trees (Pinus sylvestris L.). The results presented illustrate the potential of low-cost, ground-based air pressure measurements for monitoring wind-induced tree response. It is suggested that air pressure fluctuations can be used as surrogate information for above-canopy airflow, often used to estimate wind loads on forest trees. We demonstrate that air pressure fluctuations can be measured representatively at the forest floor and correlate very well with wind speed and direction at mean canopy-top (18 m a.g.l.) and above the 18 m high, 56-year-old forest. Their strong correlation (coefficient of determination R2 > 0.77) allows a good approximation of airflow conditions above the canopy, and, with some limitations, in the below-canopy space. Air pressure fluctuations also correlate very well with wind-induced tree motion with a similar correlation to that between wind speed and tree motion. Furthermore, the main directions of wind-induced tree motion agree very well with the propagation direction of air pressure waves. Above-canopy airflow measurements in forests with a large vertical extent are rare, and often require tall wind measurement towers. Therefore, we consider the estimation of airflow conditions over forests using ground-based air pressure measurements a promising option for monitoring the airflow conditions of relevance for predicting wind-induced tree response over large areas using a minimum of measurement infrastructure.

APA, Harvard, Vancouver, ISO, and other styles

3

DRAKE, STEPHEN A., HENDRIK HUWALD, MARC B. PARLANGE, JOHN S. SELKER, ANNE W. NOLIN, and CHAD W. HIGGINS. "Attenuation of wind-induced pressure perturbations in alpine snow." Journal of Glaciology 62, no. 234 (May 2, 2016): 674–83. http://dx.doi.org/10.1017/jog.2016.53.

Full text

Abstract:

ABSTRACTWindpumping has been identified as a process that could potentially enhance sublimation of surface snow at high forcing frequency and spawn air movement deeper in firn at lower frequencies. We performed an experiment to examine the relationship between high-frequency wind and pressure measurements within the top meter of an alpine snowpack and compared experimental results with two theoretical predictions. We find that both theoretical predictions underestimate high-frequency perturbation pressure attenuation with depth in the near-surface snowpack and the discrepancy between theory and measurement increases with perturbation pressure frequency. The impact of this result for near-surface snow is that potential enhanced sublimation will occur over a shallower snow depth than these two theories predict. Correspondingly, interstitial air mixing at depth in firn will be driven by lower frequencies than these two theories predict. While direct measurement of these energy-rich lower frequencies is beyond the scope of this paper, stationary pressure measurements validate the presence of a pressure field that could drive near-surface circulation.

APA, Harvard, Vancouver, ISO, and other styles

4

Hnidka, Jakub, and Dalibor Rozehnal. "Pressure field in measurement section of wind tunnel." MATEC Web of Conferences 107 (2017): 00075. http://dx.doi.org/10.1051/matecconf/201710700075.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Philpott, D. R. "Pressure measurement in a blow-down wind tunnel." Measurement 3, no. 3 (July 1985): 107–14. http://dx.doi.org/10.1016/0263-2241(85)90015-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Franek, Michal, Lenka Konecna, Oľga Hubová, and Juraj Žilinský. "Experimental Pressure Measurement on Elliptic Cylinder." Applied Mechanics and Materials 820 (January 2016): 332–37. http://dx.doi.org/10.4028/www.scientific.net/amm.820.332.

Full text

Abstract:

This paper deals with pressure measurement on the surface of the elliptic cylinder. Aerodynamic properties are not same for different shape of the building. Therefore it is important complex experimental measurement for complicated shape. Aim of the article is to understanding the wind loads on building for various arrangements. Results are external pressure coefficients of elliptic model for various rotations. Conclusion of the experiment is to find optimal and critical wind direction for isolated building. This research will be background for future work of interference effect.

APA, Harvard, Vancouver, ISO, and other styles

7

Liu, Jun, Yuan Quan Yang, Yan Lei Sun, and Bin He. "Simulation Study on the Wind Pressure of Village Flat Roof with Parapet Based on Different Wind Angles." Applied Mechanics and Materials 638-640 (September 2014): 228–32. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.228.

Full text

Abstract:

The main research methods to predict and research wind loads on buildings at home and abroad include wind tunnel tests, field measurement and numerical simulation. However, the wind tunnel tests and field measurement require big funds, long cycle and complicated measurement. Moreover, numerical simulation technology is quite mature. In this paper, based on fluid dynamics software CFD and criteria Reynolds k-ε turbulence model, wind field of the village flat roof with parapet is studied using the numerical simulation technology. Furthermore, the wind pressure data in different wind angles are processed and analyzed. The results show that wind angle has a significant impact on the wind pressure and its distribution. When the wind angle is 0 °, the air pressure-fluctuation in each node of the roof is small, and the pressure coefficient is steady between -1.50 and -2.00. When the wind angle is 45 °, the air pressure fluctuation in each node of the roof is large, and the pressure coefficient fluctuates between -0.8 and -3.0. When the wind angle is 90 °, the wind pressure-fluctuation in each node of the roof is equal to the fluctuation between 0 ° and 45 °wind direction angle, and the wind pressure coefficient fluctuates between -0.7 and -1.7. When incoming flow is along the asymmetric axis, the wind pressure-fluctuation is large, and the wind pressure is greater than that in the large negative pressure zone which is along the symmetry axis, which can bring serious damage on the roof.

APA, Harvard, Vancouver, ISO, and other styles

8

Zu, Gongbo, and Kit Ming Lam. "Simultaneous measurement of wind velocity field and wind forces on a square tall building." Advances in Structural Engineering 21, no. 15 (May 7, 2018): 2241–58. http://dx.doi.org/10.1177/1369433218770822.

Full text

Abstract:

Vortex shedding from a tall building is known to be responsible for the quasi-periodic across-wind force exerted on the building. This article unveils the exact relationship between the vortex shedding pattern and the fluctuating across-wind force. Simultaneous particle-image velocimetry and pressure measurements are carried out on a square-plan tall building model in the wind tunnel toward an understanding of the velocity–pressure–force relation for across-wind force generation on the building. A collection of instantaneous wind flow patterns and synchronized wind pressure distributions suggests the existence of full periods of vortex shedding from the building. The results are further analyzed using the conditional sampling method by which the roles of development and shedding of large-scale vortices in the building wake on the generation of peak across-wind forces are evidently found. Furthermore, quasi-periodicity of across-wind excitation is clearly confirmed with Hilbert transform of the across-wind force signal. The phase averaging technique is applied to the particle-image velocimetry flow fields and distinct vortex shedding patterns from the building are observed for most of the measurement time, together with an evident phase relationship with the across-wind forces.

APA, Harvard, Vancouver, ISO, and other styles

9

Zhu, Guangxia, Xin Liu, Lulu Liu, and Shengli Li. "Effect of Natural Wind on the Transiting Test for Measuring the Aerodynamic Coefficients of Structures." Symmetry 13, no. 8 (August 14, 2021): 1493. http://dx.doi.org/10.3390/sym13081493.

Full text

Abstract:

The aerodynamic coefficients transiting test is a new method for measuring the structural aerodynamic coefficients using the wind generated by a moving vehicle. However, the effect and correction of natural wind on the transiting test has not been studied. Hence, in this study, the investigation of the aerodynamic force and pressure measurements on a special triangular prism model is simulated through the transiting test under different natural wind conditions for 30° and 90° angles of wind incidence. Force and pressure measurement results in the transiting test are used to describe and explain the effect of natural wind in the range of 0–3.0 m/s on the aerodynamic coefficients of the symmetric triangular prism qualitatively and quantitatively. The results show that the driving wind field of the vehicle, aerodynamic force coefficient, and aerodynamic pressure coefficient are significantly influenced by strong natural wind greater than 1.71 m/s, which must be considered and so it is recommended that the structure aerodynamic coefficients transiting test should be conducted under the condition that the natural wind is less than 1.71 m/s. In addition, the method of two-direction round-trip measurement is proposed to modify the effect of natural wind on transiting tests.

APA, Harvard, Vancouver, ISO, and other styles

10

Bai, Wen Lei, Byun Gik Chang, Gerald Chen, Ken Starcher, David Carr, and Roy Issa. "Small Wind Turbine Power Performance Testing with Uncertainty Analysis." Advanced Materials Research 875-877 (February 2014): 1944–48. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.1944.

Full text

Abstract:

Wind turbine power performance testing consists of power, temperature, air pressure and wind speed measurements collected for this study during which measuring uncertainties are involved. Due to the measurement uncertainties, the results of power performance testing are affected; therefore, it is necessary to consider the measurement uncertainties for evaluating the accuracy of turbine testing. For this purpose of this study, uncertainty analysis for one 5kW wind turbine power performance testing was conducted. The results of uncertainty analysis indicated that the uncertainty negatively affected the validity of conclusions drawn from power performance testing, and the uncertainty sources are various in different wind speed bins.

APA, Harvard, Vancouver, ISO, and other styles

11

Barber, Sarah, Julien Deparday, Yuriy Marykovskiy, Eleni Chatzi, Imad Abdallah, Gregory Duthé, Michele Magno, Tommaso Polonelli, Raphael Fischer, and Hanna Müller. "Development of a wireless, non-intrusive, MEMS-based pressure and acoustic measurement system for large-scale operating wind turbine blades." Wind Energy Science 7, no. 4 (July 8, 2022): 1383–98. http://dx.doi.org/10.5194/wes-7-1383-2022.

Full text

Abstract:

Abstract. As the wind energy industry is maturing and wind turbines are becoming larger, there is an increasing need for cost-effective monitoring and data analysis solutions to understand the complex aerodynamic and acoustic behaviour of the flexible blades. Published measurements on operating rotor blades in real conditions are very scarce due to the complexity of the installation and use of measurement systems. However, recent developments in electronics, wireless communication and MEMS (micro-electromechanical systems) sensors are making it possible to acquire data in a cost-effective and energy-efficient way. In this work, therefore, a cost-effective MEMS-based aerodynamic and acoustic wireless measurement system that is thin, non-intrusive, easy to install, low power and self-sustaining is designed and tested in a wind tunnel. The measurement system does not require an electrical connection to the wind turbine and can be mounted and removed without damaging the blade.The results show that the system is capable of delivering relevant results continuously, although work needs to be done on calibrating and correcting the pressure signals as well as on refining the concept for the attachment sleeve for weather protection in the field. Finally, two methods for using the measurements to provide added value to the wind energy industry are developed and demonstrated: (1) inferring the local angle of attack via stagnation point detection using differential pressure sensors near the leading edge and (2) detecting and classifying leading edge erosion using instantaneous snapshots of the measured pressure fields. Ongoing work involves field tests on a 6 kW operating wind turbine in Switzerland.

APA, Harvard, Vancouver, ISO, and other styles

12

Cheng, Xiao-Xiang, Lin Zhao, Shi-Tang Ke, and Yao-Jun Ge. "A New Research Scheme for Full-Scale/Model Test Comparisons to Validate the Traditional Wind Tunnel Pressure Measurement Technique." Applied Sciences 12, no. 24 (December 14, 2022): 12847. http://dx.doi.org/10.3390/app122412847.

Full text

Abstract:

A new research scheme for a full-scale/model test comparison is proposed for effectively validating the wind tunnel pressure measurement technique in this article. With the new research scheme and using quantifiable data, future full-scale/model test comparisons are expected to reasonably disclose the main problem with the traditional atmospheric boundary layer wind tunnel pressure measurement technique with regard to the Reynolds number (Re) effects, the aero-elastic effects and the flow characteristic effects. Based on the engineering background of the Peng-cheng cooling tower, it was quantified by using the new research scheme that the average relative errors of the mean wind pressure coefficients are 52.39%, 1.87% and 35.91% for the Re effects, the aero-elastic effects and the flow characteristic effects, respectively. In view of the fluctuating wind pressure coefficients, the average relative errors are 97.58%, 21.14% and 20.20% for the Re effects, the aero-elastic effects and the flow characteristic effects, respectively. These suggest that Re effects are extremely significant for pressure measurement model tests of circular cylindrical structures, and flow characteristic effects are noticeable too. They should be mitigated using effective approaches, i.e., increasing the model surface roughness and placing the actively controlled devices at the beginning of the wind tunnel’s working section, respectively. Additionally, the key field measurement technique adopted (i.e., the calculation of the reference static pressure) and details of manufacturing the aero-elastic pressure measurement model for the present study are also expounded in the article for reference.

APA, Harvard, Vancouver, ISO, and other styles

13

He, YC, JCK Cheung, QS Li, and JY Fu. "Accurate determination of reference wind speed and reference static pressure in wind tunnel tests." Advances in Structural Engineering 23, no. 3 (September 15, 2019): 578–83. http://dx.doi.org/10.1177/1369433219875302.

Full text

Abstract:

The reference wind speed and reference static pressure are two key parameters for determining the testing results of wind tunnel experiments. Traditionally, the values of these parameters can be determined using direct measurement methods. However, such methods may suffer from less accuracy and inconvenience of operations. This article documents an indirect measurement method which, compared to the traditional methods, has the merits of higher accuracy and greater operational convenience. Examples are presented to demonstrate the main procedures of the method and typical findings by using the method in a boundary layer wind tunnel.

APA, Harvard, Vancouver, ISO, and other styles

14

Shi, Wen Hai, and Zheng Nong Li. "Field Measurement of Boundary Layer Wind Characteristics and Wind Loads on Super-Tall Building." Advanced Materials Research 243-249 (May 2011): 5128–35. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.5128.

Full text

Abstract:

Significance of full-scale experiments, analyzing wind and pressure fields in the proximity or on tall buildings, is evident from the attention that has been dedicated by researchers to these programs in the recent past. In the south and southeastern regions of China this problem is of particular relevance due to the presence of Typhoons. This paper presents some recent results measured from a super tall building located near the coast of Xiamen, Fujian province, China. In the first part of this study, attention is devoted to the characterization of the wind field atop a super-tall building; a comprehensive investigation on wind velocity and turbulence characteristics during the passage of Typhoon Fanapi is summarized. In the second part, results associated with the mean pressure and mean pressure coefficient were concentrated on the identification of direction-dependent pressure characteristics is analyzed.

APA, Harvard, Vancouver, ISO, and other styles

15

Lipecki, Tomasz, Paulina Jamińska-Gadomska, and Andrzej Sumorek. "Influence of Ultrasonic Wind Sensor Position on Measurement Accuracy under Full-Scale Conditions." Sensors 20, no. 19 (October 2, 2020): 5640. http://dx.doi.org/10.3390/s20195640.

Full text

Abstract:

A system designed for making field measurements of wind action on engineering structures is described. The system is composed of sonic anemometers, differential pressure sensors, a barometer, and a thermohygrometer. The focus of this study is to determine the indications of sonic anemometers; to accomplish this goal, wind tunnel tests were performed. The tests did not involve checking the accuracy of the devices themselves, but determining their indications under field measurement conditions where certain unavoidable errors resulting from their installation can appear. The anemometer measurement uncertainty with respect to wind speed and angle was determined. The devices were rotated in a horizontal plane and inclined against and with the mean wind speed direction in a wind tunnel. Different tunnel wind speeds were tested. The results indicate stable device readings at different horizontal plane positions at different wind speeds and a low sensitivity to changes in inclination against the inflow.

APA, Harvard, Vancouver, ISO, and other styles

16

Deparday, J., H. Müller, T. Polonelli, and S. Barber. "An experimental system to acquire aeroacoustic properties on wind turbine blades." Journal of Physics: Conference Series 2265, no. 2 (May 1, 2022): 022089. http://dx.doi.org/10.1088/1742-6596/2265/2/022089.

Full text

Abstract:

Abstract Wind turbine noise is a key issue preventing the successful exploitation of the full potential of wind energy throughout the world, especially in urban areas. To better assess and predict wind turbine noise, several aeroacoustic simulations and models have been developed over the past. Many semi-empirical models for noise emission and propagation rely on aeroacoustic properties at the blade level, including the pressure gradient, the spectrum of the pressure fluctuations, the convection velocity and the coherence lengths. Field measurements of these local quantities on operating wind turbines are valuable to improve the accuracy of the models. In the Aerosense project, a cost-effective smart measurement system is being developed that is thin, easy to install without damaging the blade, low power, self-sustaining and wirelessly transmitting. This measurement system uses MEMS sensors, which require some calibrations and corrections to obtain sufficiently accurate data. This paper describes the experimental system and its workflow, which has been developed within the Aerosense project to obtain sufficiently accurate measurements for semi-empirical noise emission and propagation models. The experimental system and its workflow are then validated in an anechoic wind tunnel on a NACA63-418 airfoil. The results show that this experimental system is able to acquire relevant aeroacoustic properties on operating wind turbines.

APA, Harvard, Vancouver, ISO, and other styles

17

Madsen, H. Aa, T. Barlas, A. Fischer, A. S. Olsen, and A. Gomez Gonzalez. "Inflow and pressure measurements on a full scale turbine with a pressure belt and a five hole pitot tube." Journal of Physics: Conference Series 2265, no. 2 (May 1, 2022): 022096. http://dx.doi.org/10.1088/1742-6596/2265/2/022096.

Full text

Abstract:

Abstract We present an autonomous add-on measurement system for detailed aerodynamic measurements on full scale turbines. From the measured data we can derive the local aerodynamic coefficients for the blade section and e.g. compare with wind tunnel data for a similar section. This forms the basis for evaluating how well the airfoil performs on a rotor in the turbulent inflow and rotating environment. We describe the measurement system which comprises a pressure belt with 15 taps, a flyboard with the data acquisition system and a five hole pitot tube measuring the local inflow to the blade section. The system was used on a SWT-4.3-120 DD turbine in a short campaign in June 2021. A trailing edge flap system is installed on that turbine and a particular objective with the measurements was to evaluate the static and dynamic performance of the flap system. The aerodynamic measurements were correlated with the SCADA and flap actuation data. Overall the measurement system performed well and provided good data like smooth pressure distributions. The derived flap performance in the form of the delta lift coefficient was close to what has been measured in wind tunnel tests. Finally, the aerodynamic and aeroelastic dynamic time response of the flap actuation could be characterized with good precision.

APA, Harvard, Vancouver, ISO, and other styles

18

Vyalkov, A. V., E. V. Zimenkov, A. M. Abashkin, and E. V. Pazhitnov. "Measurement of pressure distribution in a wind-tunnel experiment using electronic pressure commutators." Measurement Techniques 37, no. 8 (August 1994): 929–35. http://dx.doi.org/10.1007/bf00977150.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Xiaofang, Yin, Li Xiyuan, Gao Qinghua, and Wang Jing. "Research on Hot-Wire Low Pressure Wind Speed Measurement System." MATEC Web of Conferences 179 (2018): 01025. http://dx.doi.org/10.1051/matecconf/201817901025.

Full text

Abstract:

In order to verify the correctness of the thermal control design, the Mars rover needs to conduct a thermal test on the ground during the construction of the Mars exploration mission. In the course of the thermal test, real-time measurement of the wind speed at low pressure is required. Therefore, it is needed to establish a low-pressure wind speed measurement system. This article describes the composition of the test system, the choice of measurement sensors, in which the impact of wire resistance, electromagnetic interference and other factors are taken into account, and the design of the test process is completed.

APA, Harvard, Vancouver, ISO, and other styles

20

Sun, Xiao-yong, Zi-hou Yuan, and Yi-chen Yuan. "Field measurement research of wind pressure inside ribbed cooling tower." IOP Conference Series: Earth and Environmental Science 760, no. 1 (April 1, 2021): 012045. http://dx.doi.org/10.1088/1755-1315/760/1/012045.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Facchin, Luca, Gianni Bartoli, Lorenzo Procino, and Alessandra Borsani. "Optimisation of the acquisition points in wind tunnel pressure measurement." IABSE Symposium Report 97, no. 2 (January 1, 2010): 1–8. http://dx.doi.org/10.2749/222137810796064237.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Luo, Kun, San Xia Zhang, Zhi Ying Gao, Jian Wen Wang, Sheng Hua Zhu, Li Ru Zhang, and Jian Ren Fan. "Large-Eddy Simulation of Flow around a Horizontal-Axis Wind Turbine." Applied Mechanics and Materials 291-294 (February 2013): 450–55. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.450.

Full text

Abstract:

Three-dimensional ﬂow around a horizontal-axis wind turbine has been investigated with LES method coupled with sliding mesh and experimental measurement. The boundary conditions are set as the same as those of the experiment. The images of the pressure distribution, flow rate distribution, turbulent intensity, velocity vector and vortices of the wind turbine are presented to show the three-dimensional flow characteristics around the wind turbine. The relationship between flow and sound is further studied by analyzing the flow parameters pulsation spectrum to get the sound pressure level. LES results are compared with the wind-tunnel measurements collected with PIV, and good agreement is observed. The results serve as a reference for optimum design of the wind turbine with high functional performance and low level noise generation.

APA, Harvard, Vancouver, ISO, and other styles

23

Zhao, Xue Jun, Xiao Guo Guo, and Chang Zhao. "A New Support Structure in Waverider Force Measurement." Applied Mechanics and Materials 318 (May 2013): 96–99. http://dx.doi.org/10.4028/www.scientific.net/amm.318.96.

Full text

Abstract:

In this paper a new support structure was given to solve the problem met in the force measurement with engine jet. The force measurements of waverider were undertaken in the hypersonic wind tunnel. The test condition was at Ma=6, angle of attack α=-6°-6°, at which we researched the effects on the vehicle aerodynamics of inlet cowl opening and closing, support system, engine jet, and pressure ratios. To decrease the effects of strut on the jet flow-field, we took sharp belly strut to support the model in the wind tunnel. The belly strut could support the waverider model, force measurement balance, and it could make the inlet flow set up, and provide the high pressure jet. The test results showed that the belly sharp strut had little effects on the flowfield and could inject the inlet flow, and could provide very high quality jet.

APA, Harvard, Vancouver, ISO, and other styles

24

Redeker, K. R., A. J. Baird, and Y. A. Teh. "Quantifying wind and pressure effects on trace gas fluxes across the soil–atmosphere interface." Biogeosciences Discussions 12, no. 6 (March 24, 2015): 4801–32. http://dx.doi.org/10.5194/bgd-12-4801-2015.

Full text

Abstract:

Abstract. Large uncertainties persist in estimates of soil–atmosphere exchange of important trace gases. One significant source of uncertainty is the combined effect of wind and pressure on these fluxes. Wind and pressure effects are mediated by surface topography: few surfaces are uniform and over scales of tenths of a meter to tens of meters, air pressure and wind speed at the ground surface may be very variable. In this paper we consider how such spatial variability in air pressure and wind speed affects fluxes of trace gases. We used a novel nested wind tunnel design, comprising a toroidial wind tunnel in which wind speed and pressure may be controlled, set within a larger, linear wind tunnel. The effects of both wind speed and pressure differentials on fluxes of CO2 and CH4 within three different ecosystems (forest, grassland, peat bog) were quantified. We find that trace gas fluxes are positively correlated with both wind speed and pressure differential near the surface boundary. We argue that wind speed is the better proxy for trace gas fluxes because of its stronger correlation and because wind speed measurement is more easily accomplished and wind speed measurement methodology can be more easily standardized. Trace gas fluxes, whether into or out of the soil, increase with wind speed within the toroidal tunnel (+54% flux per m s−1), while faster, localized surface winds that are external to the toroidal wind tunnel reduce trace gas fluxes (−11% flux per m s−1). These results are consistent for both trace gases over all ecosystem soil types studied. Our findings support the need for a revised conceptualization of soil–atmosphere gas exchange. We propose a conceptual model of the soil profile that has a "mixed layer", with fluxes controlled by wind speed, wind duration, porosity, water table, and gas production and consumption.

APA, Harvard, Vancouver, ISO, and other styles

25

Procházka, Pavel, Vladislav Skála, Pavel Antoš, Lukáš Popelka, Jiří Fürst, and Michal Schmirler. "Lift measurement of airfoil AH93-157 from wall pressure distribution." EPJ Web of Conferences 264 (2022): 01031. http://dx.doi.org/10.1051/epjconf/202226401031.

Full text

Abstract:

Measurement of the lift coefficient of the AH93-157 airfoil was performed by measuring the static pressure distribution on the wind tunnel walls along the test-section. A correlation was established between the lift coefficient value, determined by integrating the static pressure distribution on the wind tunnel walls, and the lift coefficient value, determined by integrating the static pressure distribution on the airfoil surface. This method is useful for easy and quick determination of the lift coefficient on a simple airfoil model without complicated static pressure tubing from the surface. The measurement was made within a closed test-section. The correlation relationship also eliminates the problem of the finite span and the effect of the side walls. Comparison of pressure distribution on airfoil with CFD was performed as well.

APA, Harvard, Vancouver, ISO, and other styles

26

Barbieri, Lindsay, Stephan Kral, Sean Bailey, Amy Frazier, Jamey Jacob, Joachim Reuder, David Brus, et al. "Intercomparison of Small Unmanned Aircraft System (sUAS) Measurements for Atmospheric Science during the LAPSE-RATE Campaign." Sensors 19, no. 9 (May 10, 2019): 2179. http://dx.doi.org/10.3390/s19092179.

Full text

Abstract:

Small unmanned aircraft systems (sUAS) are rapidly transforming atmospheric research. With the advancement of the development and application of these systems, improving knowledge of best practices for accurate measurement is critical for achieving scientific goals. We present results from an intercomparison of atmospheric measurement data from the Lower Atmospheric Process Studies at Elevation—a Remotely piloted Aircraft Team Experiment (LAPSE-RATE) field campaign. We evaluate a total of 38 individual sUAS with 23 unique sensor and platform configurations using a meteorological tower for reference measurements. We assess precision, bias, and time response of sUAS measurements of temperature, humidity, pressure, wind speed, and wind direction. Most sUAS measurements show broad agreement with the reference, particularly temperature and wind speed, with mean value differences of 1.6 ± 2.6 ∘ C and 0.22 ± 0.59 m/s for all sUAS, respectively. sUAS platform and sensor configurations were found to contribute significantly to measurement accuracy. Sensor configurations, which included proper aspiration and radiation shielding of sensors, were found to provide the most accurate thermodynamic measurements (temperature and relative humidity), whereas sonic anemometers on multirotor platforms provided the most accurate wind measurements (horizontal speed and direction). We contribute both a characterization and assessment of sUAS for measuring atmospheric parameters, and identify important challenges and opportunities for improving scientific measurements with sUAS.

APA, Harvard, Vancouver, ISO, and other styles

27

Bajić, Stefan, Martin Pelikán, and Kateřina Rostás. "Experimental measurement of cooler pressure loss of Formula student car." MATEC Web of Conferences 367 (2022): 00002. http://dx.doi.org/10.1051/matecconf/202236700002.

Full text

Abstract:

To achieve the maximum performance of an engine while maintain safety of the race car, it is essential to cool it properly. Therefore, this article deals with the experimental measurement of the cooling modules pressure drop of the formula student car. Leading to the right choice of the fan behind the radiator. Series of measurements were taken at the UWB in the wind tunnel of the department of Power System Engineering.

APA, Harvard, Vancouver, ISO, and other styles

28

Soto-Valle, Rodrigo, Sirko Bartholomay, Jörg Alber, Marinos Manolesos, Christian Navid Nayeri, and Christian Oliver Paschereit. "Determination of the angle of attack on a research wind turbine rotor blade using surface pressure measurements." Wind Energy Science 5, no. 4 (December 22, 2020): 1771–92. http://dx.doi.org/10.5194/wes-5-1771-2020.

Full text

Abstract:

Abstract. In this paper, a method to determine the angle of attack on a wind turbine rotor blade using a chordwise pressure distribution measurement was applied. The approach used a reduced number of pressure tap data located close to the blade leading edge. The results were compared with the measurements from three external probes mounted on the blade at different radial positions and with analytical calculations. Both experimental approaches used in this study are based on the 2-D flow assumption; the pressure tap method is an application of the thin airfoil theory, while the probe method applies geometrical and induction corrections to the measurement data. The experiments were conducted in the wind tunnel at the Hermann Föttinger Institut of the Technische Universität Berlin. The research turbine is a three-bladed upwind horizontal axis wind turbine model with a rotor diameter of 3 m. The measurements were carried out at rated conditions with a tip speed ratio of 4.35, and different yaw and pitch angles were tested in order to compare the approaches over a wide range of conditions. Results show that the pressure tap method is suitable and provides a similar angle of attack to the external probe measurements as well as the analytical calculations. This is a significant step for the experimental determination of the local angle of attack, as it eliminates the need for external probes, which affect the flow over the blade and require additional calibration.

APA, Harvard, Vancouver, ISO, and other styles

29

Klõšeiko, P., E. Arumägi, J. Hallik, and T. Kalamees. "Dependence of measured specific air leakage rate (q_E50) on envelope pressure differences and measurement position: a case study in an apartment building in winter conditions." Journal of Physics: Conference Series 2069, no. 1 (November 1, 2021): 012229. http://dx.doi.org/10.1088/1742-6596/2069/1/012229.

Full text

Abstract:

Abstract Airtightness of the building envelope has become an important component in achieving ever stricter energy performance levels. However, airtightness measurements using blower door method are dependent on choices made by the specialist conducting the tests. One being the assessment of baseline pressure difference inside the building and position of the measurement equipment. Ideally, the test will be conducted without wind and stack effect which could disturb the envelope pressure measurements. Unfortunately, such conditions seldom exist, especially in colder climates. This increases the appeal of conducting apartment-wise measurements over whole-building measurements as it is far easier to comply with the ISO 9972. However, the apartment-wise method has a relatively random nature due to small share of actual building envelope. This paper investigates the effect of using different measurement positions and pressure levels on the airtightness measurement results. A 5-storey 15m tall residential building was used as a case study and measured as a whole and in select apartments. The results show that the variation caused by different choices of pressure levels, measurement positions etc caused relatively low variations and whole-building measurement should be preferred even if not all baseline and pressure level requirements are not met.

APA, Harvard, Vancouver, ISO, and other styles

30

TAKANO, Yasuhide, Shoma SUGAKI, Kazuyuki NAKAKITA, T. Goji ETOH, and Kohsei TAKEHARA. "PRELIMINARY STUDY ON WIND PRESSURE MEASUREMENT ON SOLID WAVY BED WITH PRESSURE SENSITIVE PAINT." Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 77, no. 2 (2021): I_919—I_924. http://dx.doi.org/10.2208/jscejhe.77.2_i_919.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Ristic, Slavica, Suzana Linic, and Marija Samardzic. "Turbulence investigation in the VTI’s experimental aerodynamics laboratory." Thermal Science 21, suppl. 3 (2017): 629–47. http://dx.doi.org/10.2298/tsci160130187r.

Full text

Abstract:

Wind tunnels are the aerodynamic laboratories which task is to enable high quality and stabile airflow in controlled volume, a test section, during run time, in order to study the effects of streaming around various aeronautical or nonaeronautical models (airfoils and bluff bodies with complex motorized or robotic constructions). The main requirement that leads to quality and reliable measurement results is a high flow quality in the test section: uniformity of the velocity and pressure fields along and across the test section, low turbulence level and low flow direction angularities or swirling. The knowledge of low parameters enables the exchange of the scientific and technical information, comparison of the experimental results from different wind tunnels and data scaling of the model to the real scale. The turbulence intensity TI significantly affects the wind tunnel results and reduction of turbulence is of the highest importance for the quality measurements. This paper presents the Experimental Aerodynamics Laboratory of the VTI in Belgrade, the equipment and methods of turbulence measurements in the test section stream and around different test models. Wind tunnel facilities maintain equipment and devices for sampling, acquisition and data reduction for various test types, from forces and moment measurements, over the pressure distribution measurements to the advanced measurements, followed with the appropriate flow visualization techniques. The modern instrumentation enables determine flow quality and its influence on tests and measurement results of static and dynamic model characteristics.

APA, Harvard, Vancouver, ISO, and other styles

32

Maraveas, Chrysanthos. "Wind Pressure Coefficients on Greenhouse Structures." Agriculture 10, no. 5 (May 1, 2020): 149. http://dx.doi.org/10.3390/agriculture10050149.

Full text

Abstract:

Commercial production greenhouses are widely used to produce plants and crops. From the structural engineering viewpoint, among the loads that act on greenhouses, wind and snow loads are the major ones. This paper focuses on the former, particularly on wind pressure coefficients. Design and construction of greenhouses should consider wind loads in order to ensure seamless operation, overall stability, durability, and safety, even though human occupancy is limited. Classification and design of greenhouses is typically based on European standards, which cover a variety of geometries and conditions. Some recent research studies suggest, however, that greenhouse design standards should be revised to ensure structural safety of greenhouses subject to strong wind loads. Triggered by this recent outcomes, this paper reviews existing literature on the topic: (a) briefly presenting the state of the art methods for determining wind pressures on greenhouses; (b) comparing the EN 13031-1 pressure coefficients with those stemming from recent experimental studies on single-span pitched and arched roof greenhouses in South Korea; and (c) summarizing most recent comparative results for multi-span greenhouses. It concludes that these recent research studies are not enough to justify revision of EN 13031-1, and more measurement data and experimental or numerical studies are necessary to justify such a conclusion.

APA, Harvard, Vancouver, ISO, and other styles

33

van den Kroonenberg, Aline, Tim Martin, Marco Buschmann, Jens Bange, and Peter Vörsmann. "Measuring the Wind Vector Using the Autonomous Mini Aerial Vehicle M2AV." Journal of Atmospheric and Oceanic Technology 25, no. 11 (November 1, 2008): 1969–82. http://dx.doi.org/10.1175/2008jtecha1114.1.

Full text

Abstract:

Abstract The meteorological mini unmanned aerial vehicle (M2AV) was used for measuring the meteorological wind. The wind is the vector difference between the aircraft speed relative to the earth (inertial velocity) and relative to the airflow (true airspeed). The latter was computed from five-hole-probe pressure measurements in combination with calibration–coefficient polynomials obtained during wind tunnel calibration. The aircraft inertial velocity, position, and attitude were calculated using a Kalman filter that combined data from a global positioning system (GPS) and an inertial navigation system (INS). The temporal (and spatial) resolution of the M2AV wind measurement is remarkably fine. An inertial subrange of locally isotropic turbulence can be measured up to 40 Hz (or 0.55 m at 22 m s−1 airspeed). The first M2AV wind estimation showed some systematic deviations compared to the expected values (like a constant mean wind in every flight direction). Therefore, an in-flight wind calibration technique was developed that corrects for the inaccuracy of the true heading, the constant offset of the pitch angle, and the underestimation of the true airspeed. The final adjusted wind measurements were verified during a field experiment at the measurement field of the German Meteorological Service, southeast of Berlin. The mean horizontal and vertical wind measured by the M2AV agreed well with simultaneous sodar and tower measurements.

APA, Harvard, Vancouver, ISO, and other styles

34

Wang, Qin Hua, Bi Qing Shi, and Le Le Zhang. "Wind Pressure Distribution on a Large-Span Roof Structure." Applied Mechanics and Materials 166-169 (May 2012): 234–38. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.234.

Full text

Abstract:

In this paper, wind tunnel test of a large-span roof structure is firstly introduced. Secondly, data processing on synchronous multi-spots pressure measurement test is given. Wind pressure distribution is calculated by using the method mentioned in this paper. Some results and conclusion are useful for design of large-span roof structure.

APA, Harvard, Vancouver, ISO, and other styles

35

Donelan, Mark A., Alexander V. Babanin, Ian R. Young, Michael L. Banner, and Cyril McCormick. "Wave-Follower Field Measurements of the Wind-Input Spectral Function. Part I: Measurements and Calibrations." Journal of Atmospheric and Oceanic Technology 22, no. 7 (July 1, 2005): 799–813. http://dx.doi.org/10.1175/jtech1725.1.

Full text

Abstract:

Abstract An experimental study of wind energy and momentum input into finite-depth wind waves was undertaken at Lake George, New South Wales, Australia. To measure microscale oscillations of induced pressure above surface waves, a high-precision wave-follower system was developed at the University of Miami, Florida. The principal sensing hardware included Elliott pressure probes, hot-film anemometers, and Pitot tubes. The wave-follower recordings were supplemented by a complete set of relevant measurements in the atmospheric boundary layer, on the surface, and in the water body. This paper is dedicated to technical aspects of the measurement procedure and data analysis. The precision of the feedback wave-following mechanism did not impose any restrictions on the measurement accuracy in the range of wave heights and frequencies relevant to the problem. Thorough calibrations of the pressure transducers and moving Elliott probes were conducted. It is shown that the response of the air column in the connecting tubes provides a frequency-dependent phase shift, which must be accounted for to recover the low-level induced pressure signal. In the finite-depth environment of Lake George, breaking waves play an important role in the momentum exchange between wind and waves, as will be shown in a subsequent paper.

APA, Harvard, Vancouver, ISO, and other styles

36

Zou, Qiong, Xuan Zeng, Chao Wang, and Yijun Shen. "Study of the wind-pressure distribution of flat-roof parabolic condensers based on wind-tunnel tests." Clean Energy 6, no. 6 (December 1, 2022): 893–906. http://dx.doi.org/10.1093/ce/zkac067.

Full text

Abstract:

Abstract The structure of parabolic condensers makes them susceptible to wind load because of their thin and large windward mirrors. In this paper, the wind pressure on a model of a condenser mirror (1:35) on multistorey flat roofs is analysed via pressure measurement in a wind tunnel. The mean wind-pressure distribution law of flat-roof condenser mirrors (including the change law with working conditions and the maximum distribution characteristics) and the distribution law of fluctuating and extreme wind pressure are obtained. Furthermore, by comparison with the ground-based condenser distribution law, similarities and differences between the two are obtained. Research results show that the wind-pressure distribution law of flat-roof parabolic condenser mirrors is the same as those on the ground, but the mean wind-pressure coefficient (absolute value) is generally ~30% smaller. Furthermore, the maximum effect is generally located at the windward mirror edge and the mirror is more susceptible to wind pressure in wind directions of 30° and 135°–150°. The results of this study can provide a theoretical reference for wind-resistant structure design and multistorey flat-roof condenser-related research.

APA, Harvard, Vancouver, ISO, and other styles

37

Chen, Qiuhua, and Xiaoxi Zhang. "Experimental Analysis of Wind Pressure Characteristics in a Reduced-Scale Model of a Slab-Shaped High-Rise Building at Different Inflow Conditions with Various Wind Flow Directions." Processes 10, no. 8 (August 18, 2022): 1645. http://dx.doi.org/10.3390/pr10081645.

Full text

Abstract:

Wind resistance is one of the most important safety targets for high-rise buildings, especially slab-shaped ones with relatively large length–width ratios. In this study, the characteristics of wind pressure on a reduced-scale model of a slab-shaped high-rise building were analyzed experimentally. The experiment was conducted using the DTC Initium electronic scanning pressure measurement system in the wind tunnel at the Xiamen University of Technology, China. The spatial distribution and time-frequency characteristics of the wind pressure signals were analyzed with various wind flow directions under uniform and boundary-layer inflow conditions. The results show that both of the inflow conditions and the wind directions have significant influences on the magnitude and distribution characteristics of the wind pressure on the building surfaces. The wavelet transform-based analysis shows that the wind pressure on the building surfaces presents obvious intermittent characteristics, with the instantaneous energies pulsating intensively in the time-frequency domain, illustrating the unsteady nature of the wind pressure loads on the building. The influence and risk of the unsteady pulsating pressure loads should be considered when evaluating the wind-resistant performances of this type of building.

APA, Harvard, Vancouver, ISO, and other styles

38

Inouye, Sakae, Nobuhiko Okabe, Hiromichi Obara, and Yoshibumi Sugihara. "Measurement of Cough-Wind Pressure: Masks for Mitigating an Influenza Pandemic." Japanese Journal of Infectious Diseases 63, no. 3 (May 31, 2010): 197–98. http://dx.doi.org/10.7883/yoken.63.197.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Buck, Gregory M. "Simultaneous luminescence pressure and temperature measurement system for hypersonic wind tunnels." Journal of Spacecraft and Rockets 32, no. 5 (September 1995): 791–94. http://dx.doi.org/10.2514/3.26685.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

MIZUTANI, Natsuki, Masahiro KAJI, and Masahiro MIYAJIMA. "Air Pressure Distribution above Wind Waves computed from PIV Measurement Data." Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 69, no. 2 (2013): I_1401—I_1405. http://dx.doi.org/10.2208/kaigan.69.i_1401.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

YOSHIDA, Akihito, Tsuyoshi KURITA, and Yukio TAMURA. "The effect of processed pipe with bending for wind pressure measurement." Journal of Wind Engineering 25, no. 1 (2000): 82_81–82_87. http://dx.doi.org/10.5359/jwe.25.82_81.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Amos, Richard T., David W. Blowes, Leslie Smith, and David C. Sego. "Measurement of Wind-Induced Pressure Gradients in a Waste Rock Pile." Vadose Zone Journal 8, no. 4 (November 2009): 953–62. http://dx.doi.org/10.2136/vzj2009.0002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Farahani, Mohammad, Abbas Daliri, and Javad Sepahi Younsi. "Supersonic inlet buzz detection using pressure measurement on wind tunnel wall." Aerospace Science and Technology 86 (March 2019): 782–93. http://dx.doi.org/10.1016/j.ast.2019.02.002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Krzysiak, A. "Bottom drag measurements in experimental wind tunnel tests." Journal of Physics: Conference Series 2367, no. 1 (November 1, 2022): 012001. http://dx.doi.org/10.1088/1742-6596/2367/1/012001.

Full text

Abstract:

Abstract The paper presents the results of wind tunnel tests aimed at determining the model bottom drag in the case of rocket model tests. The balance measurement technique of the rocket model fixed in the wind tunnel test section by the rear sting was discussed. The model was equipped with the two parallel boosters. Based on the wind tunnel test of the rocket twin model the values of the bottom pressure was determined for tested Mach numbers. An algorithm of wind tunnel corrections was shown, which allowed the total drag determination in a case of the rocket active or passive rocket flight. The test results showed the necessity of the bottom drag measurements in wind tunnel tests.

APA, Harvard, Vancouver, ISO, and other styles

45

Azarov, Valerii, Tat’yana Solov’eva, and Sergei Svitskov. "A mathematical model of odor dispersion from a wastewater treatment plant." E3S Web of Conferences 138 (2019): 01029. http://dx.doi.org/10.1051/e3sconf/201913801029.

Full text

Abstract:

Smell is an important criterion of the quality of atmospheric air. The paper looks at quantitative and qualitative methods of odor assessment and describes the method of field olfactometry. Studies were carried out on the spread of odor from the WWTP OAO OKOS in the Kaliningrad region of Russia which resulted in 817 measurements. For each measurement, the following parameters were recorded: odor strength (D/T), odor character, atmospheric pressure (mmHg), temperature (°C), relative humidity (%), wind speed (m/s), wind direction and the the point where a measurement was taken. A mathematical model is given of the dependence of odor strength on the distance to two sources s1 (m) and s2 (m) and the wind direction from a straight line passing through a given point and a source 1 — a1 or a source 2 — a2.

APA, Harvard, Vancouver, ISO, and other styles

46

Wang, Xu, Peng Huang, Zengshun Chen, Xinlai Peng, and Ming Gu. "Field investigation of wind–rain induced pressure on a low-rise building during Typhoon Haikui." Advances in Structural Engineering 23, no. 15 (June 24, 2020): 3208–22. http://dx.doi.org/10.1177/1369433220930322.

Full text

Abstract:

Due to the strike of wind-blown raindrops, the pressure caused by wind and rain on building facades is different from the action of wind-only. The wind–rain induced pressure during Typhoon Haikui (2012) was collected at three taps on the windward side of Tongji University experimental building which was located near the coast of East China Sea. The observed data during the storm was compared with both the data of normal wind events without rains and wind tunnel test. The results show that the presence of driving rains intensifies the wind effects acting on the windward side of the building. More specifically, the mean wind–rain induced pressure coefficients at the three locations of the experimental building are larger than those collected from the strong wind-only events and the wind tunnel test when the wind direction ranges from 110° to 130°. It was also found that the mean wind–rain induced pressure coefficients at each tap increase in magnitude with rainfall intensity and the distance between the pressure tap and the wall corner. Similarly, the fluctuating wind–rain induced pressure coefficients are larger in comparison to the wind-only pressure coefficients from the full-scale measurement and wind tunnel test. However, the coefficients decrease with the distance from the wall corner in the case of 80°–140° wind directions. In addition, it was found that Gamma distribution is a robust model to represent the probability distribution of the wind–rain induced pressure coefficients. High quality of pressure correlation was observed among three taps, regardless of the rainfall intensity. By contrast, the presence of driving rains slightly reduces the correlation of wind–rain induced pressure.

APA, Harvard, Vancouver, ISO, and other styles

47

Gilotte, Philippe, Iraj Mortazavi, Alfonso Colon de Carvajal, Stephie Edwige, and Christian Navid Nayeri. "Aerodynamical characteristics of a reduced scale ground vehicle according to yaw angle variations." International Journal of Numerical Methods for Heat & Fluid Flow 32, no. 4 (October 25, 2021): 1222–36. http://dx.doi.org/10.1108/hff-08-2021-0522.

Full text

Abstract:

Purpose The purpose of this paper is to study pressure measurement correlations, as the location of the pressure sensors should enable to capture variation of the drag force depending on the yaw angle and some geometrical modifications. Design/methodology/approach The present aerodynamical study, performed on a reduced scale mock-up representing a sport utility vehicle, involves both numerical and experimental investigations. Experiments performed in a wind tunnel facility deal with drag and pressure measurements related to the side wind variation. The pressure sensor locations are deduced from wall streamlines computed from large eddy simulation results on the external surfaces of the mock-up. Findings After validation of the drag coefficient (Cd) values computed with an aerodynamic balance, measurements should only imply pressure tap mounted on the vehicle to perform real driving emission (RDE) tests. Originality/value Relation presented in this paper between pressure coefficients measured on a side sensor and the drag coefficient data must enable to better quantify the drag force contribution of a ground vehicle in RDE tests.

APA, Harvard, Vancouver, ISO, and other styles

48

Franek, Michal, Marek Macák, and Oľga Hubová. "Distribution of the external pressure coefficients on the elliptic tower: experimental measurement compared with numerical modelling." MATEC Web of Conferences 313 (2020): 00047. http://dx.doi.org/10.1051/matecconf/202031300047.

Full text

Abstract:

The wind flow around the elliptical object was investigated experimentally in the BLWT wind tunnel in Bratislava and subsequently solved by computer wind flow simulation. On a high-rise building model, the external wind pressure coefficients were evaluated for different wind directions and then compared with the numerical CFD simulation in ANSYS, where different models of turbulence and mesh types were used. The aim of the article was to evaluate and compare the obtained values and after analysing the results to choose the most suitable model of turbulence and mesh types, which showed the smallest deviations from the experimental values.

APA, Harvard, Vancouver, ISO, and other styles

49

Chen, Gang, Yongqi Huang, Peng Wu, Ruoqiang Feng, and Fangyuan Zhou. "Characteristics of Extreme Wind Pressure on the Open Prefabricated Spatial Grid Structure of Evergrande Stadium." Buildings 13, no. 1 (December 22, 2022): 25. http://dx.doi.org/10.3390/buildings13010025.

Full text

Abstract:

Large-span open prefabricated spatial grid structures are characterized by light mass, high flexibility, low self-oscillation frequency, and low damping, resulting in wind-sensitive structures. Meanwhile, their height tends to be relatively low, located in the wind field with a large wind speed gradient and high turbulence area. Therefore, surface airflow is complex, and many flow separations, reattachment, eddy shedding, and other phenomena occur, causing damage to local areas. This paper took the Evergrande Stadium in Guiyang, China, as the research object and used the random number cyclic pre-simulation method to study its surface extreme wind pressure. Firstly, five conventional distributions (Gaussian, Weibull, three-parameter gamma, generalized extreme value, and lognormal distribution) were fitted to the wind pressure probability densities at different measurement points on the surface of the open stadium. It is found that the same distribution could not be chosen to describe the probability density distribution of wind pressure at all measurement points. Hence, based on the simulation results, the Gaussian and non-Gaussian regions of this structure were divided to determine where to apply which distribution. Additionally, the accuracy of the peak factor, improved peak factor, and modified Hermite moment model method were compared to check their applicability. Finally, the effect of roughness on the extreme wind pressure distribution on the open stadium surface was also investigated according to the highest accuracy method above. The findings of this study will provide a reference for engineers in designing large-span open stadiums for wind resistance to minimize the occurrence of wind damage.

APA, Harvard, Vancouver, ISO, and other styles

50

Wang, Tao, Ze Huan Huang, Hui Zhang, and Bin Zheng. "The Displacement Measurement of Ground Wind Loads for Launch Vehicle." Applied Mechanics and Materials 568-570 (June 2014): 100–105. http://dx.doi.org/10.4028/www.scientific.net/amm.568-570.100.

Full text

Abstract:

This paper presented a method of the displacement measurement of ground wind loads for launch vehicle based on laser and Digital Image Processing Technology. The launch vehicle structure model was built by calculating the wind pressure. Measurement model and algorithm for single laser were given. In view of nonrigid component, a method for computing the centroid displacement was presented. Error analysis and error reducing measures were preliminarily discussed.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Wind-pressure Measurement'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles