Relevant bibliographies by topics / Boundary Layer Wind Tunnel (BLWT)

Academic literature on the topic 'Boundary Layer Wind Tunnel (BLWT)'

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Published: 10 March 2023

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Journal articles on the topic "Boundary Layer Wind Tunnel (BLWT)"

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Hubová, Oľga, Lenka Konecna, and Peter Lobotka. "Influence of Walls and Ceiling on a Wind Flow in BLWT Tunnel." Applied Mechanics and Materials 617 (August 2014): 257–62. http://dx.doi.org/10.4028/www.scientific.net/amm.617.257.

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This paper deals with determination of the parameters of simulated boundary layer in newly built Boundary Layer Wind Tunnel (BLWT). Short description of tunnel, measuring devices and possibilities of using of tunnel are mentioned here. All measurements, which were necessary for basic analysis of simulated natural wind, are shortly mentioned. The main part of this paper is devoted to additional measurements, which were necessary for detection of influences of boundary effects in part of the cross-section of tunnel where the calibration of Hot-wire anemometer is usually done. These boundary effects evoke deceleration of the wind velocity in given area. Description of additional measurements and obtained results are presented at the end of this paper.
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Magát, Marek, Ivana Olekšáková, and Juraj Žilinský. "Development of the Boundary Layer in the Rear Section in BLWT STU - Trnavka." Advanced Materials Research 855 (December 2013): 141–44. http://dx.doi.org/10.4028/www.scientific.net/amr.855.141.

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This paper deals with the basic simulation of boundary layer in the wind tunnel in STU Bratislava and boundary layer given in the Slovak Technical Standard STN EN 1991-1-4 in Bratislava for category of terrain no. IV. The wind tunnel mainly allows experiments to determine the realistic reproduction of the static and dynamic response of a scale models of the buildings and structures immersed in a turbulent flow which simulates the natural wind in various categories of terrain. We have to deal with similarity criteria of modeling the objects, measuring the pressure and the velocity of flow in the tunnel by using the whole range of devices such as Pitot static probe, Constant Temperature Anemometry, Particle Image Velocimetry etc. all under the control in the program Labview developed by National Instruments .Than we are able to measure the pressure coefficients or any other parameters needed for design of buildings and structures of any shape and size, allowed by tunnel dimensions, placed on a different types of terrain roughness. The most recent research in new BLWT was calibration and simulation of boundary layer in the rear space of the tunnel.
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Hubová, Oľga, and Peter Lobotka. "The Multipurpose New Wind Tunnel STU." Civil and Environmental Engineering 10, no. 1 (May 1, 2014): 1–9. http://dx.doi.org/10.2478/cee-2014-0001.

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Abstract BLWT STU tunnel, which is currently in test mode, will in its two measuring sections allow to prepare measurements with laminar and turbulent wind flow. The front section will fulfill technical parameters of steady flow for testing sectional models and dynamically similar models. In the rear operating section it is necessary to reproduce correctly the roughness of the earth surface covering different terrain categories and to prepare boundary layer suitable for experimental testing. Article deals with the brief description of the preparation and testing laminar flow and boundary layer for the urban terrain, which was simulated with rough elements and barriers of different heights. The attention is focused in getting get at least 1 meter height of boundary layer, which allows to optimize scale similarity of model.
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Magát, Marek, Ivana Olekšáková, and Juraj Žilinský. "Development of Boundary Layer in CRIACIV in Florence (Prato) and Comparison with CFD." Applied Mechanics and Materials 820 (January 2016): 359–64. http://dx.doi.org/10.4028/www.scientific.net/amm.820.359.

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In this article are described the results from testing profile of atmospheric boundary layer in BLWT (Boundary layer wind tunnel) in Florence (Prato), Italy with emphasis on comparison of the results with simulations in CFD (Computational fluid dynamics) software OpenFoam. The values are compared with calculated values from EuroCode.
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Medvecká, Soňa, Ol’ga Ivánková, Marek Macák, and Vladimíra Michalcová. "Determination of Pressure Coefficient for a High-Rise Building with Atypical Ground Plan." Civil and Environmental Engineering 14, no. 2 (December 1, 2018): 138–45. http://dx.doi.org/10.2478/cee-2018-0018.

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Abstract In this article, the results of pressure coefficient on the atypical object obtained by experimental measurements in a boundary layer wind tunnel (BLWT) of Slovak University of Technology in Bratislava (STU) and computational fluid dynamics simulation (CFD) are presented. The pressure coefficient is one of the most important parameters expressing the wind pressure distribution on the structure. The loading by wind can only be acquired by execution of detailed tests and numerical analyses [1].
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Veghova, Ivana, and Olga Hubova. "Influence of the near standing hall for wind flowing around group of circular cylinders." MATEC Web of Conferences 310 (2020): 00013. http://dx.doi.org/10.1051/matecconf/202031000013.

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This article deals with experimental investigation of air flow around in – line standing circular cylinders and influence of nearby standing hall on external wind pressure distribution. The wind pressure distribution on the structures is an important parameter in terms of wind load calculation. For vertical circular cylinders in a row arrangement only wind force coefficient is possible find in Eurocode. 1991-1-4. External wind pressure coefficient depends on wind direction and the ratio of distance and diameter b. Influence of nearby standing structure is not possible find in Eurocode. The series of parametric wind tunnel studies was carried out in Boundary Layer Wind Tunnel (BLWT) STU to investigate the external wind pressure coefficient in turbulent wind flow. Experimental measurements were performed in BLWT for 2 reference wind speeds, which fulfilled flow similarity of prototype and model. We have compared the results of free in - line standing 3 circular cylinder and influence of hall on distribution of wind pressure at 3 height levels in turbulent wind flow and these results were compared with values in EN 1991-1-4.
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De Queiroz, Matheus, Guilherme Loyola França De Vasconcellos, Cristiana Brasil Maia, Julien Weiss, and Sérgio De Morais Hanriot. "Investigation of the Predictive Ability of Two Advection Schemes on the Formation of a Turbulent Separation Bubble in a Boundary Layer Wind Tunnel." Applied Mechanics and Materials 477-478 (December 2013): 181–85. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.181.

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This paper presents a study that correlates the capacity of two advection schemes in foreseeing flow separation inside a boundary layer wind tunnel (BLWT herein after). The geometry of the BLWT forces the generation of a turbulent separation bubble. Numerical simulations were carried out with the commercial Computational Fluid Dynamics software ANSYS-CFX®. The high-resolution advection scheme is shown to be more appropriate than the upwind scheme in predicting flows where properties are subject to strong gradients, such as pressure and velocity.
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Hubová, Oľga, Michal Franek, and Marek Macák. "Numerical and experimental determination of wind load on photovoltaic panel assemblies." Gradjevinski materijali i konstrukcije 63, no. 4 (2020): 49–63. http://dx.doi.org/10.5937/grmk2004049h.

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The article presents the aerodynamic study of solar panel assemblies and determination of wind load. In the first part, the task is solved by computer simulation of the wind flow around the proposed rectangular assembly in the scale of 1:1 using the FLUENT ANSYS program; realization of experimental measurements in the wind tunnel with a boundary layer (BLWT) in Bratislava is presented subsequently. The aim of the solution was to determine the maximum pressure and suction wind load on top and bottom surfaces of panels. The resulting net pressure coefficient represents the maximum local pressure in each panel row as maximum values from all wind directions. The experimentally obtained net pressure coefficient values were compared with computer simulation and the procedures mentioned in standard STN EN 1991-1-4. It can be seen that the inner panels are loaded considerably less than the standard defines. The panels placed on the side of the assembly or on the edge of the aisle are loaded significantly more than the standard defines. Frontal panels are also less wind stressed than in the standard defines.
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Franek, Michal, and Marek Macák. "Effects of Interference on Local Peak Pressures Between Two Buildings with an Elliptical Cross-Section." Slovak Journal of Civil Engineering 29, no. 1 (March 1, 2021): 35–41. http://dx.doi.org/10.2478/sjce-2021-0006.

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Abstract The interference effects on the distribution of external wind pressure coefficient between two high-rise buildings with an elliptical cross section were studied experimentally at the Boundary Layer Wind Tunnel (BLWT) at the Faculty of Civil Engineering STU in Bratislava, Slovakia. Various arrangements of models, which were derived from the breadth ratio, were investigated. The peak value of the external wind pressure coefficient for a stand-alone model was measured and compared with the peak value in the case of interference. The measurements showed that the wind loads on buildings in a close vicinity are considerably different from those on a stand-alone building. The interference effects significantly affect negative pressure zones. The optimal and critical arrangements of buildings were evaluated. The elimination of peak negative external wind pressure coefficients can be reduced by half. On the other hand, the interference effects had a strong impact on increasing the peak value of the negative external wind pressure coefficient, which can be more than roughly double compared to an isolated building.
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Jiménez-Portaz, María, María Clavero, and Miguel Ángel Losada. "A New Methodology for Assessing the Interaction between the Mediterranean Olive Agro-Forest and the Atmospheric Surface Boundary Layer." Atmosphere 12, no. 6 (May 21, 2021): 658. http://dx.doi.org/10.3390/atmos12060658.

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Historically, the olive grove has been one of the most emblematic ecosystems in Mediterranean countries. Currently, in Andalusia, Spain, the land under olive grove cultivation exceeds 1.5 million hectares, approximately 17% of the regional surface. Its exploitation has traditionally been based on the use of the available land and heterogeneous plantations, with different species adapted to southern Mediterranean climatic conditions, and to the management of the traditional olive cultivation culture. The objective of this work is to characterize the mechanical behavior of the atmospheric surface boundary layer (SBL) (under neutral stability) interacting with different olive grove configurations. Experimental tests were carried out in the Boundary Layer Wind Tunnel (BLWT) of the Andalusian Institute for Earth System Research (IISTA), University of Granada. Three representative configurations of olive groves under neutral atmospheric conditions were tested. The wind flow time series were recorded at several distances and heights downwind the olive plantation models with a cross hot wire anemometry system. Herein, this paper shows the airflow streamwise, including the mean flow and the turbulent characteristics. The spatial variability of these two mechanical magnitudes depends on, among others, the size, the agro-forest length, the layout of the tree rows, the porosity, the tree height, the crown shape and the surface vegetation cover. The aerodynamic diameter and Reynolds number for each agro-forest management unit are proposed as representative variables of the system response, as these could be related to olive grove management. The plantation, in turn, conforms to a windbreak, which affects the microclimate and benefits the elements of the ecosystem. Detailed knowledge of these variables and the interaction between the ecosystem and the atmosphere is relevant to optimize the resources management, land use and sustainability of the overall crop. Thus, this paper presents preliminary work to relate atmospheric variables to environmental variables, some of which could be humidity, erosion, evapotranspiration or pollen dispersion.
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Dissertations / Theses on the topic "Boundary Layer Wind Tunnel (BLWT)"

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Grossir, Guillaume. "Longshot hypersonic wind tunnel flow characterization and boundary layer stability investigations." Doctoral thesis, Universite Libre de Bruxelles, 2015. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209044.

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The hypersonic laminar to turbulent transition problem above Mach 10 is addressed experimentally in the short duration VKI Longshot gun tunnel. Reentry conditions are partially duplicated in terms of Mach and Reynolds numbers. Pure nitrogen is used as a test gas with flow enthalpies sufficiently low to avoid its dissociation, thus approaching a perfect gas behavior. The stabilizing effects of Mach number and nosetip bluntness on the development of natural boundary layer disturbances are evaluated over a 7 degrees half-angle conical geometry without angle of attack.

Emphasis is initially placed on the flow characterization of the Longshot wind tunnel where these experiments are performed. Free-stream static pressure diagnostics are implemented in order to complete existing stagnation point pressure and heat flux measurements on a hemispherical probe. An alternative method used to determine accurate free-stream flow conditions is then derived following a rigorous theoretical approach coupled to the VKI Mutation thermo-chemical library. Resulting sensitivities of free-stream quantities to the experimental inputs are determined and the corresponding uncertainties are quantified and discussed. The benefits of this different approach are underlined, revealing the severe weaknesses of traditional methods based on the measurement of reservoir conditions and the following assumptions of an isentropic and adiabatic flow through the nozzle. The operational map of the Longshot wind tunnel is redefined accordingly. The practical limits associated with the onset of nitrogen flow condensation under non-equilibrium conditions are also accounted for.

Boundary layer transition experiments are then performed in this environment with free-stream Mach numbers ranging between 10-12. Instrumentation along the 800mm long conical model includes flush-mounted thermocouples and fast-response pressure sensors. Transition locations on sharp cones compare favorably with engineering correlations. A strong stabilizing effect of nosetip bluntness is reported and no transition reversal regime is observed for Re_RN<120000. Wavelet analysis of wall pressure traces denote the presence of inviscid instabilities belonging to Mack's second mode. An excellent agreement with Linear Stability Theory results is obtained from which the N-factor of the Longshot wind tunnel in these conditions is inferred. A novel Schlieren technique using a short duration laser light source is developed, allowing for high-quality flow visualization of the boundary layer disturbances. Comparisons of these measurement techniques between each other are finally reported, providing a detailed view of the transition process above Mach 10.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished

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Clifton, Andrew James. "Wind tunnel investigations of boundary layer conditions before and during snow drift /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17165.

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Bertholds, Alexander. "CFD Simulations of the New University of Sydney Boundary Layer Wind Tunnel." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-166945.

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Using Computational Fluid Dynamics Simulations, the flow in the new University of Sydney closed circuit wind tunnel has been analyzed prior to the construction of the tunnel. The objective was to obtain a uniform flow in the test section of the wind tunnel while keeping the pressure losses over the tunnel as low as possible. This was achieved by using several flow-improving components such as guide vanes, screens, a honeycomb and a settling chamber. The guide vanes were used in the corners and in the diverging part leading into the settling chamber, giving a significant improvement of the flow as they prevent it from taking undesired paths. The settling chamber is used to decelerate the flow before it is accelerated when leaving the settling chamber, a process which reduces the turbulence in the flow. Screens were used in the settling chamber to further improve the flow by imposing a pressure drop which evens out differences in the flow speed and reduces the turbulence. The honeycomb, which is situated in the end of the settling chamber, makes the flow more uniform by forcing it to go in only one direction. A uniform flow was obtained using three screens and one honeycomb together with the guide vanes and the settling chamber.
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Mazur, Zachary Thomas Lyn. "Calibration and Baseline Flow Surveys of a Reconstructed Boundary-Layer Wind Tunnel." Youngstown State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1597422848793191.

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Wu, Jie [Verfasser]. "Boundary-layer Instability Experiments in a Tandem Nozzle Supersonic Wind Tunnel / Jie Wu." Aachen : Shaker, 2015. http://d-nb.info/106904864X/34.

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Tirtey, Sandy C. "Characterization of a transitional hypersonic boundary layer in wind tunnel and flight conditions." Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210367.

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Laminar turbulent transition is known for a long time as a critical phenomenon influencing the thermal load encountered by hypersonic vehicle during their planetary re-entry trajectory. Despite the efforts made by several research laboratories all over the world, the prediction of transition remains inaccurate, leading to oversized thermal protection system and dramatic limitations of hypersonic vehicles performances. One of the reasons explaining the difficulties encountered in predicting transition is the wide variety of parameters playing a role in the phenomenon. Among these parameters, surface roughness is known to play a major role and has been investigated in the present thesis.

A wide bibliographic review describing the main parameters affecting transition and their coupling is proposed. The most popular roughness-induced transition predictions correlations are presented, insisting on the lack of physics included in these methods and the difficulties encountered in performing ground hypersonic transition experiments representative of real flight characteristics. This bibliographic review shows the importance of a better understanding of the physical phenomenon and of a wider experimental database, including real flight data, for the development of accurate prediction methods.

Based on the above conclusions, a hypersonic experimental test campaign is realized for the characterization of the flow field structure in the vicinity and in the wake of 3D roughness elements. This fundamental flat plate study is associated with numerical simulations for supporting the interpretation of experimental results and thus a better understanding of transition physics. Finally, a model is proposed in agreement with the wind tunnel observations and the bibliographic survey.

The second principal axis of the present study is the development of a hypersonic in-flight roughness-induced transition experiment in the frame of the European EXPERT program. These flight data, together with various wind tunnel measurements are very important for the development of a wide experimental database supporting the elaboration of future transition prediction methods.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished

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Blanco, Mark Richard. "Design and Qualification of a Boundary-Layer Wind Tunnel for Modern CFD Validation Experiments." Youngstown State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1559237473563483.

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Fonti, Elio. "Measurements of aircraft wake vortices in ground proximity within an atmospheric boundary layer wind tunnel." Thesis, Cranfield University, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/5635.

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The vortex wake characteristics of aircraft during landing and take-off are of interest in connection with both the safety of following aircraft penetrating the vortex and the dispersion of engine exhaust plumes. A series of measurements were carried out in an Atmospheric Boundary Layer Wind Tunnel (ABLWT) to identify and characterise both the mean and turbulent flow field of a pair of wake vortices in ground proximity. Cont/d.
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Petersen, Graciana [Verfasser], and Bernd [Akademischer Betreuer] Leitl. "Wind tunnel modelling of atmospheric boundary layer flow over hills / Graciana Petersen. Betreuer: Bernd Leitl." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2013. http://d-nb.info/1031280405/34.

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Petersen, Graciana Verfasser], and Bernd [Akademischer Betreuer] [Leitl. "Wind tunnel modelling of atmospheric boundary layer flow over hills / Graciana Petersen. Betreuer: Bernd Leitl." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2013. http://nbn-resolving.de/urn:nbn:de:gbv:18-60540.

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Books on the topic "Boundary Layer Wind Tunnel (BLWT)"

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O'Hare, J. E. A nonperturbing boundary-layer transition detector. Arnold Air Force Station, Tenn: Arnold Engineering Development Center, 1985.

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Ginger, J. D. A computerized data acquisition system for the boundary layer wind tunnel. ST. Lucia, Q., Australia: Dept. of Civil Engineering, the University of Queensland, 1990.

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Harris, Charles D. Modifications to the Langley 8-foot transonic pressure tunnel for the laminar flow control experiment. Hampton, Va: Langley Research Center, 1988.

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Evans, J. Research on boundary layer transition fixing in the DREV indraft wind tunnel. Valcartier, Quebec: Defence Research Establishment, 1988.

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Murthy, A. V. Effects of aspect ratio on sidewall boundary-layer influence in two-dimensional airfoil testing. Hampton, Va: Langley Research Center, 1986.

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Murthy, A. V. Sidewall boundary-layer measurements with upstream suction in the Langley 0.3-meter Transonic Cryogenic Tunnel. Hampton, Va: Langley Research Center, 1988.

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United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., ed. Sidewall boundary-layer measurements with upstream suction in the Langley 0.3-meter transonic cryogenic tunnel. [Washington, DC]: National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988.

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T, Pot, and United States. National Aeronautics and Space Administration., eds. Shock wave/turbulent boundary layer interaction in the flow field of a tridimensional wind tunnel. Washington D.C: National Aeronautics and Space Administration, 1987.

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Kreplin, Hans-Peter. Wall shear stress measurements on a prolate spheroid at zero incidence in the DNW wind tunnel. Gottingen: Koln, 1986.

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Center, Ames Research, ed. Flow unsteadiness effects on boundary layers. [Moffett Field, Calif: NASA Ames Research Center, 1989.

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Book chapters on the topic "Boundary Layer Wind Tunnel (BLWT)"

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Meroney, R. N. "Wind Tunnel Simulation of Convective Boundary Layer Phenomena." In Buoyant Convection in Geophysical Flows, 313–25. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5058-3_14.

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Meier, H. U., U. Michel, and H. P. Kreplin. "The Influence of Wind Tunnel Turbulence on the Boundary Layer Transition." In Perspectives in Turbulence Studies, 26–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82994-9_2.

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Rasuo, Bosko. "On Boundary Layer Control in Two-Dimensional Transonic Wind Tunnel Testing." In Solid mechanics and its applications, 473–82. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/978-1-4020-4150-1_46.

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Yoshie, Ryuichiro. "Wind Tunnel Experiment and Large Eddy Simulation of Pollutant/Thermal Dispersion in Non-isothermal Turbulent Boundary Layer." In Advanced Environmental Wind Engineering, 167–96. Tokyo: Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-55912-2_9.

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Fedorovich, E., and R. Kaiser. "Wind Tunnel Model Study of Turbulence Regime in the Atmospheric Convective Boundary Layer." In Buoyant Convection in Geophysical Flows, 327–70. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5058-3_15.

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Iacobello, Giovanni, Luca Ridolfi, Massimo Marro, Pietro Salizzoni, and Stefania Scarsoglio. "Complex Network Analysis of Wind Tunnel Experiments on the Passive Scalar Dispersion in a Turbulent Boundary Layer." In Springer Proceedings in Physics, 215–20. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22196-6_34.

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Rahmat, Nurizzatul Atikha, Mohammad Rozaki Ramli, Mujahid Husaimi Che Hassan, Kamil Khalili Haji Abdullah, and Khairun Adhani Khairunizam. "Enhanced Smoke Wire Technique with Control Dripping Valve in a Small Scaled Quasi-atmospheric Boundary Layer Wind Tunnel." In Technological Advancement in Mechanical and Automotive Engineering, 611–27. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1457-7_47.

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Hirose, Naoki, Yuichi Matsuo, Takashi Nakamura, Martin Skote, and Dan Henningson. "Large Scale Parallel Direct Numerical Simulation of a Separating Turbulent Boundary Layer Flow over a Flat Plate Using NAL Numerical Wind Tunnel." In Lecture Notes in Computer Science, 494–500. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-39999-2_46.

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Gorbushin, Anton, Svetlana Osipova, and Vladimir Zametaev. "Mean Parameters of Incompressible Turbulent Boundary Layer with Zero Pressure Gradient on the Wall of the TsAGI T-128 Wind Tunnel at Very High Reynolds Numbers." In Springer Proceedings in Physics, 29–34. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-80716-0_4.

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R. Wittwer, Adrián, Acir M. Loredo-Souza, Jorge O. Marighetti, and Mario E. De Bortoli. "Wind Tunnel Experiments on Turbulent Boundary Layer Flows." In Boundary Layer Flows - Modelling, Computation, and Applications of Laminar, Turbulent Incompressible and Compressible Flows [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.106544.

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The knowledge and experimental development of boundary layer turbulent flows is extremely important in applications related to the building aerodynamics, wind comfort, atmospheric dispersion, and even aeronautics. The Aerodynamic Laboratories of the UFRGS and UNNE have been making joint activities related to wind engineering such as those mentioned earlier for more than 25 years. In this work, a compilation of different experiments on turbulent boundary layer flows realized in these both laboratories is carried out. The characteristics of flows that develop on a smooth surface of the wind tunnel are experimentally evaluated. Then, reduced-scale models of atmospheric boundary layer flows are analyzed including the effects of turbulence generators and surface roughness. Special attention on the behavior of the turbulent parameters in the case of experimental studies using low mean velocity is paid. Finally, some comments referring to recent studies on thermal effects in turbulent boundary layer flows and the development of reduced-scale models of convective flows are included.
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Conference papers on the topic "Boundary Layer Wind Tunnel (BLWT)"

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Refan, Maryam, and Horia Hangan. "Experimental and Theoretical Study on the Aerodynamic Performance of a Small Horizontal Axis Wind Turbine." In ASME 2010 Power Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/power2010-27174.

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An upwind, three-bladed small horizontal axis wind turbine (HAWT) with a rotor of 2.2 m in diameter is tested in the Boundary Layer Wind Tunnel Laboratory II (BLWTL II). The power output of the turbine is measured for free stream velocities ranging from 1 m/s to 9 m/s. The blade element momentum (BEM) theory is implemented to predict the power curve of the HAWT. The theoretical characteristics of the turbine are discussed in terms of power and torque coefficients and the experimental results are compared to the numerical (BEM) estimation. Moreover, a force balance test is carried out on a single stationary blade for 16 angles of incidence, −6°≤α′≤30°, and three free stream velocities, 5, 7 and 9 m/s, and integral blade aerodynamic coefficients are determined. These experimental characteristics are intended to provide a useful basis for developing an alternative computational method to use integral blade experimental aerodynamic data to predict the power curve of the wind turbine in the transition zone between dynamic stall and fully stalled regimes.
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Nagel, R. T., and O. Alaverdi. "The NCSU Low Speed Boundary Layer Wind Tunnel." In Aerospace Technology Conference and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1985. http://dx.doi.org/10.4271/851897.

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WHITE, B. "A low-density boundary-layer wind tunnel facility." In 25th AIAA Aerospace Sciences Meeting. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1987. http://dx.doi.org/10.2514/6.1987-291.

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Casper, Katya, Steven Beresh, John Henfling, Russell Spillers, Brian Pruett, and Steven Schneider. "Hypersonic Wind-Tunnel Measurements of Boundary-Layer Pressure Fluctuations." In 39th AIAA Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-4054.

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Drela, Mark. "Boundary Layer Ingesting Fan Design for a Wind Tunnel." In AIAA SCITECH 2022 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2022. http://dx.doi.org/10.2514/6.2022-1531.

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Bottasso, Carlo L., and Filippo Campagnolo. "Wind Turbine and Wind Farm Control Testing in a Boundary Layer Wind Tunnel." In 32nd ASME Wind Energy Symposium. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-0875.

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WOOD, N., and L. ROBERTS. "Wind tunnel wall boundary layer control by Coanda wall jets." In 27th Aerospace Sciences Meeting. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-149.

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Ward, Christopher, Dennis C. Berridge, Roger Greenwood, Andrew Abney, and Steven P. Schneider. "Boundary-Layer Transition Experiments in a Hypersonic Quiet Wind Tunnel." In 43rd AIAA Fluid Dynamics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-2738.

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AZZAZY, M., D. MODARRESS, and R. HALL. "Optical boundary-layer transition detection in a transonic wind tunnel." In 19th AIAA, Fluid Dynamics, Plasma Dynamics, and Lasers Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1987. http://dx.doi.org/10.2514/6.1987-1430.

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Seitz, Arne, Matthias Horn, Alexander Barklage, Peter Scholz, Camli Badrya, and Rolf Radespiel. "Wind Tunnel Verification of Laminar Boundary Layer Control TSSD Concept." In AIAA AVIATION 2022 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2022. http://dx.doi.org/10.2514/6.2022-3552.

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Reports on the topic "Boundary Layer Wind Tunnel (BLWT)"

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Marshall, R. D. Performance requirements and preliminary design of a boundary layer wind tunnel facility. Gaithersburg, MD: National Bureau of Standards, 1985. http://dx.doi.org/10.6028/nbs.ir.85-3168.

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Grossir, Guillaume. On the design of quiet hypersonic wind tunnels. Von Karman Institute for Fluid Dynamics, December 2020. http://dx.doi.org/10.35294/tm57.

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This document presents a thorough literature review on the development of hypersonic quiet tunnels. The concept of boundary layer transition in high-speed flows is presented first. Its consequences on the free-stream turbulence levels in ground facilities are reviewed next, demonstrating that running boundary layers along the nozzle walls must remain laminar for quiet operation. The design key points that enable laminar boundary layers and hypersonic operation with low free-stream noise levels are then identified and discussed. The few quiet facilities currently operating through the world are also presented, along with their design characteristics and performances. The expected characteristics and performances of a European quiet tunnel are also discussed, along with flow characterization methodologies and different measurement techniques. It is finally shown that the required expertise to establish the first European quiet hypersonic wind tunnel is mostly at hand.
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Fuchs, Marcel, Jerry Hatfield, Amos Hadas, and Rami Keren. Reducing Evaporation from Cultivated Soils by Mulching with Crop Residues and Stabilized Soil Aggregates. United States Department of Agriculture, 1993. http://dx.doi.org/10.32747/1993.7568086.bard.

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Field and laboratory studies of insulating properties of mulches show that the changes they produce on the heat balance and the evaporation depend not only on the intrinsic characteristics of the material but also on the structure of air flow in boundary layer. Field measurements of the radiation balance of corn residue showed a decrease of reflectivity from 0.2 to 0.17 from fall to spring. The aerodynamic properties of the atmospheric surface layer were turbulent, with typical roughness length of 12 to 24 mm. Evaporation from corn residue covered soils in climate chambers simulating the diurnal course of temperature in the field were up to 60% less than bare soil. Wind tunnel studies showed that turbulence in the atmospheric boundary layer added a convective component to the transport of water vapor and heat through the mulches. The decreasing the porosity of the mulch diminished this effect. Factors increasing the resistance to vapor flow lowering the effect of wind. The behavior of wheat straw and stabilized soil aggregates mulches were similar, but the resistance to water of soil aggregate layer with diameter less than 2 mm were very large, close to the values expected from molecular diffusion.
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