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Добірка наукової літератури з теми "BLADE ANGLES"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "BLADE ANGLES"

Li, Yan, Chang Zhao, Chunming Qu, Shouyang Zhao, Fang Feng, and Kotaro Tagawa. "Effect of Auxiliary Blade on Aerodynamic Characteristics of Vertical Axis Wind Turbine by Numerical Simulation." International Journal of Rotating Machinery 2019 (April 21, 2019): 1–17. http://dx.doi.org/10.1155/2019/8098160.

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Анотація:

In order to improve the aerodynamic characteristics of the Straight-bladed Vertical Axis Wind Turbine (SB-VAWT), a rotor structure with auxiliary blade installed behind the main blade was proposed in this study. To investigate the effects of relative thickness and the fixing angle of the auxiliary blade on aerodynamic characteristics of SB-VAWT, numerical simulations were carried out. Two shapes of NACA 4-digital series blade-section, NACA0018 and NACA0024, were selected as the main blades in this work. Effects of relative thickness and fixing angles of auxiliary blade on the aerodynamic performance of SB-VAWT had been analyzed in detail, which had 5 kinds of relative thickness and 3 kinds of fixing angles combined into 13 working conditions. And the main blades and the auxiliary blades were also decided as the NACA series airfoil with five kinds of relative thickness. Three kinds of fixing angle of auxiliary blade installed behind main blade were used including 0°, 5°, and 10°. The simulations included the output power coefficients, the static torque coefficients, and the flow fields around the main blade and auxiliary blade for both the dynamic and static conditions at some typical azimuth angles. The results show that the auxiliary blade with certain relative thickness and fixing angle can improve the output power characteristics and static torque characteristics of SB-VAWT, which can also provide research reference for improving the performance of VAWT.

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DEDA ALTAN, Burcin. "Enhancement of the performance of vertical axis wind rotors with straight blades." European Mechanical Science 7, no. 2 (June 20, 2023): 49–55. http://dx.doi.org/10.26701/ems.1246352.

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Анотація:

In this study, it has been aimed to improve the performance of vertical axis wind rotors with straight blades. For this purpose, an additional performance-enhancing setup has been used, placed in front of the vertical axis wind rotor with straight blades, in order to increase the performance. The effects on the rotor performance increase have been investigated numerically by keeping the dimensions of this performance-enhancing additional setup constant, by changing the number of blades of the straight bladed rotor and by changing the blade angles if the straight blades have been angled. Numerical analyzes performed in this study have been validated by experimental literature data. After creating the solid models required for the rotor performance analysis, the computational fluid dynamics (CFD) program ANSYS Fluent has been used. Here, studies have been carried out with two, three and four bladed rotors as the number of blades. As the blade angle, the effects of the angles between 180 and 120 have been examined. As a result of the study with the additional performance setup (APS), it has been determined that the optimum performance has been obtained with the vertical axis rotor with three blades and 150 blade angle. As a final result, it has been determined that the power coefficient obtained from the optimum vertical axis rotor with additional performance setup increased approximately 2.6 times compared to the optimum rotor without setup.

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Pribadyo, Pribadyo, Hadiyanto H, and Jamari J. "Simulasi Performa Turbin Propeller Dengan Sudut Pitch Yang Divariasikan." Jurnal Mekanova: Mekanikal, Inovasi dan Teknologi 6, no. 1 (June 11, 2020): 54. http://dx.doi.org/10.35308/jmkn.v6i1.2257.

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Propeller turbine performance can be improved by changing the turbine design parameters. One method that was developed is to vary the blade angle on the runner's blades. Analysis of the influence of blade angle on propeller turbine performance is done through numerical simulations based on computational fluid dynamics. The simulation is done with variations of propeller turbine blade angles of 180, 230, and 280 at flow rates of 0.08 m/s to 0.5 m/s. Simulation results show turbines with 250 blade angles have the best performance compared to turbine blade angles of 230 and 280. While the turbine blade angles of 230 tend to have higher performance compared to angles of 280 even though both have peak values for the corresponding power coefficient. Keywords—Propeller turbine, runner blade, pitch angle, CFD simulation

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Thresher, R. W., A. D. Wright, and E. L. Hershberg. "A Computer Analysis of Wind Turbine Blade Dynamic Loads." Journal of Solar Energy Engineering 108, no. 1 (February 1, 1986): 17–25. http://dx.doi.org/10.1115/1.3268046.

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Анотація:

The flapping motion of a single wind turbine rotor blade has been analyzed and equations describing the flapping motion have been developed. The analysis was constrained to allow only flapping motions for a cantilevered blade, and the equations of motion are linearized. A computer code, called FLAP (Force and Loads Analysis Program), to solve the equations of motion and compute the blade loads, has been completed and compared to measured loads for a 3-bladed downwind turbine with stiff blades. The results of the program are presented in tabulated form for equidistant points along the blade and equal azimuth angles around the rotor disk. The blade deflection, slope and velocity, flapwise shear and moment, edgewise shear and moment, blade tension, and blade torsion are given. The deterministic excitations considered in the analysis include wind shear, tower shadow, gravity, and a prescribed yaw motion.

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Saowalak Thongdee, Churat Tararuk, Natthawud Dussadee, Rameshprabu Ramaraj, and Tanate Chaichana. "Study on performance of a savonius wind turbines related with the blade angle." Maejo International Journal of Energy and Environmental Communication 1, no. 2 (August 9, 2019): 32–36. http://dx.doi.org/10.54279/mijeec.v1i2.244916.

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Анотація:

This research aimed to compare the performance of Savonius vertical axis wind turbines through blade numbers and different blade angles. In this study, applicable turbines having 4, 6, 8, 12, 16 and 18 numbers of blades with the angles of the blades of -15°, -5°, 0°, 5° and 15°, respectively. The rotor used was a semicircle shaped blade made from PVC material and has a blade diameter of 6 cm and 30 cm for both rotor diameter and height. The turbine was tested deadweight range of 0-0.49 kg at 4 m/s wind speed. The results showed that the blade angle has a positive effect on increasing the power and torque coefficient of Savonius wind turbine, specifically on blades less than 16. The highest power and torque coefficient was obtained from the turbine having16 blades at an angle of 5°. This configuration also found that the maximum power and torque coefficient in the tip speed ratio ranging from 0.3-0.4 are 0.2519 and 0.5858, respectively.

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Wu, Kuo-Tsai, Kuo-Hao Lo, Ruey-Chy Kao, and Sheng-Jye Hwang. "Numerical and Experimental Investigation of the Effect of Design Parameters on Savonius-Type Hydrokinetic Turbine Performance." Energies 15, no. 5 (March 2, 2022): 1856. http://dx.doi.org/10.3390/en15051856.

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Анотація:

To meet the increased demand of hydroelectric power generation, a novel drag-based Savonius turbine with the characteristics of a simpler fabrication process and good starting characteristics is designed, fabricated, and analyzed. The newly designed turbine is suitable to be installed in rivers, irrigation channels, ocean currents, etc., for small-scale hydroelectric power generation. In the present study, experiments are carried out to investigate the influence of the design parameters of this turbine on its power performance in order to improve its efficiency, including blade arc angles (180°, 135°), blade placement angles (0°, ±22.5°), and the number of blades (2, 3, 6, and 8). Further, three-dimensional CFD simulations are performed with Re = 6.72×105, matching the experimental conditions, in order to study the changes in the flow field and the rotation characteristics of the turbine. The research results indicate that a six-bladed turbine with a blade arc angle of 135° and a blade placement angle of 0° has higher torque and better power performance, which makes it the most suitable design when also considering cost. Furthermore, it was found that an increase in the number of turbine blades contributes to improving the performance of the turbine. The maximum power coefficient is 0.099 at a tip speed ratio of 0.34.

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Li, Xin-kai, Jin-xue Guo, Xiao-ming Chen, Ke Yang, Tian-yu He, and Xiao-dong Wang. "Experimental and Numerical Analysis of the Effect of a New Lightning Protection System on Lightning Protection and Aerodynamic Noise Performance of Wind Turbine Blades." Electronics 8, no. 9 (September 12, 2019): 1020. http://dx.doi.org/10.3390/electronics8091020.

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Анотація:

In order to tackle the problem of the high failure rate of blades of large wind turbine units due to lightning damage, a new lightning protection system (NLPS) for wind turbine blades is proposed based on the lightning damage mechanism of blades. Firstly, 10 high-voltage discharge tests are performed for blades with and without the NLPS to study the effect of lightning protection. The results show that when the surface of the blade without the NLPS is struck by lightning 10 times, the damage rate of the blade is 100%; for the blade with the NLPS and the lightning attachment position is always on the NLPS in 10 discharge tests, the damage rate of blades is 0% and the lightning protection rate of blades is 100%, indicating that the lightning protection effect for blades with the NLPS is greatly improved. Moreover, the static electric fields of the blades with and without the NLPS are calculated. The results show that the NLPS can shield the electric field around the lower lead wire of the blade, thus effectively reducing the electric field intensity. The NLPS initiates the upward leader more easily than the lower lead wire; therefore, the lightning attachment point is located on the NLPS, thus protecting the blade. Secondly, the aerodynamic and aero-noise characteristics of the blade with and without the NLPS are calculated. The results indicate that the NLPS has little influence on the aerodynamic performance of the blade but has some influence on the aero-noise of the blade. The aero-noise of the airfoil can be reduced at angles of attack of 4°, 8°, 11°, and 15°, but the influence of different phase angles of the airfoil on the amplitude of the sound pressure level (SPL) varies. The aero-noise of the airfoil with the NLPS decreases by 16% and 8% at angles of attack of 4° and 8°, respectively. In general, the design of the NLPS reaches the desired requirements, but it still needs to be further optimized in combination with the blade manufacturing process.

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Yan, Jing, Xiaobing Liu, Li Peng, and Jianan Li. "A new design way for cylindrical blades with adjustable inlet blade angles." Advances in Mechanical Engineering 11, no. 6 (June 2019): 168781401983017. http://dx.doi.org/10.1177/1687814019830174.

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Анотація:

A new approach for cylindrical blade design is presented in this article. Authors of this article analyzed the main reasons which are responsible for the low efficiency of untwisted blades and found out that the shock losses along the blade leading edge are much higher than those of twisted blades. Furthermore, based on the analysis, this article proposed a new design approach that is different from the traditional one. This new approach can reduce hydraulic losses at blade leading edge and improve performance and efficiency of cylindrical blades. In the traditional design process, to draw blade projection in plan view, an incidence at intersection of blade leading edge and inner streamline on the meridional section is selected for calculating blade inlet angle accurately. Because the incidence and the blade inlet angle at the intersection of blade leading edge and outer streamline are formed automatically, the blade inlet angles at this point are not suitable for oncoming flow direction, generating noticeable shock losses at this place. In the new design program, blade inlet angles at both intersection points formed by blade leading edge and the outer, inner streamlines are accurately calculated. This makes the shock losses generated by blade leading edge be minimized. Moreover, in conventional design, the projection of blade pressure side into plan view consists of only one plane curve. In the new design way, projection of blade surface in plan view is composed of two curves joined smoothly and continuously. Two impellers with fundamentally identical geometrical parameters were designed and manufactured, and the only difference is that their cylindrical blades were calculated and configured by applying a traditional design method or a the new approach. Test findings from an open loop indicate that in a wide load range from 0.8 to 1.2 times design flow rate, both head and efficiency of the new pump were raised. Over the operating range, efficiency of the new pump increased by 0.5% to 2.7%. Particularly, for higher flow rate, pump performance was improved significantly, and the increase of efficiency at pump design point arrived at 2.7%. The results suggest that the new approach presented in this article offers an effective and useful means to improve performance of low specific speed pumps.

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Li, Yan, Fang Feng, Wen Qiang Tian, and Kotaro Tagawa. "Numerical Simulation on the Static Torque Performance of Vertical Axis Wind Turbine with Different Blade Airfoils." Applied Mechanics and Materials 84-85 (August 2011): 702–5. http://dx.doi.org/10.4028/www.scientific.net/amm.84-85.702.

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Анотація:

Recently, the straight-bladed vertical axis wind turbine (SB-VAWT) receives more and more attentions for its simple design, low cost, and good maintenance. The torque performance of the SB-VAWT is greatly affected by the blade airfoil. In order to research the static torque characteristics of SB-VAWT with symmetrical and non-symmetrical blade airfoil, numerical simulations by 2D CFD method were carried out on three kinds of blade airfoils including NACA0018, NACA2418 and NACA4418 at different azimuth angles. Furthermore, the static torque coefficient of the SB-VAWT with four blades with the three kinds of blade airfoils was calculated. The pressure and velocity fields were also obtained to analyze the static torque performance. Based on these results, the effects of blade airfoils on the starting torque performance of the SB-VAWT were compared and discussed.

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Tao, Yi, Yongming Bai, and Yingchun Wu. "Influence of Blade Thickness on Solid–Liquid Two-Phase Flow and Impeller Wear in a Ceramic Centrifugal Slurry Pump." Processes 9, no. 8 (July 21, 2021): 1259. http://dx.doi.org/10.3390/pr9081259.

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Анотація:

The impeller blades of ceramic slurry pumps are usually very thick for the purpose of prolonging the service life. In this paper, numerical simulations and wear test were conducted to investigate the influence of blade thickness on the solid–liquid two-phase flow and impeller wear in a ceramic centrifugal slurry pump. The wear test was conducted for CFD validation. The numerical results show that the incident angles of solid particles increase with increasing blade thickness, which results in larger wrap angles of the solid particle trajectories. The increasing wrap angles of the solid particle trajectories offset the region that the collisions between the blade pressure side and the solid particles side take place towards the impeller exit and lead to more impacts between the solid particles and the blade suction side. The numerical results are in good accordance with the wear pattern of the tested impellers, which demonstrates that the numerical method adopted in this paper is predictable in the abrasion of the impeller of a ceramic centrifugal slurry pump. The experimental results show that an increase in the blade thickness alleviates the abrasion of the leading edges and the pressure side of the impeller blades; however, it also aggravates the abrasion of the blade suction side and decreases the pump performance.

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Більше джерел

Дисертації з теми "BLADE ANGLES"

Weiss, Samuel Bruce. "Vertical axis wind turbine with continuous blade angle adjustment." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/65178.

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Анотація:

Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student submitted PDF version of thesis.
Includes bibliographical references (p. 26).
The author presents a concept for a vertical axis wind turbine that utilizes each blade's entire rotational cycle for power generation. Each blade has its own vertical axis of rotation and is constrained to rotate at the rate of one half of a revolution per full revolution of the rotor. For a rotor of radius r and blades of width b, a technical analysis predicts a theoretical maximum power coefficient of CP = b 2r+b, neglecting wind flow interference by upwind blades. This theoretical power coefficient is generally greater than the efficiency of a typical Savonius wind turbine (CP ~~ 0.15), and it reaches CP = 0.5 at the limiting blade width, b = 2r. The analysis also predicts a static torque and optimal tip-speed ratio that are both greater than those of a Savonius wind turbine with similar blade dimensions. Design considerations for implementing the kinematic constraint and for blade adjustment to account for changes in wind direction are discussed, and the author's prototype is presented. Testing of the prototype demonstrated that implementation of the kinematic constraint is feasible, and that efficiencies greater than those achievable by a Savonius turbine are plausible. In 4 m s wind conditions, the prototype yielded an estimated CP of 0.15, with much room for improvement through design changes and blade optimization in future iterations of this style of turbine.
by Samuel Bruce Weiss.
S.B.

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Carrasco, Mora Enrique. "Variable Stator Nozzle Angle Control in a Turbocharger Inlet." Thesis, KTH, Kraft- och värmeteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-174345.

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Анотація:

Turbochargers are becoming an essential device in internal combustion engines as they boost the intake air with more pressure in order to increase the power output. These devices are normally designed for a single steady design point but the pulsating flow delivered from the internal combustion engine is everything but steady. The efficiency drop experienced in the off-design points by the fixed geometry turbochargers have made some research groups to look into new variable geometry solutions for turbocharging. A nozzle ring is a device which normally achieves a higher performance under design conditions, but the efficiency rapidly drops at off-design conditions. In this paper, a variable angle nozzle ring is designed and implemented in the model of a radial turbine of a turbocharger in order to study its potential when working under real internal combustion engine cycles. To understand the profit margin the turbine performance is compared with two turbines with the same impeller geometry: one without nozzle ring and one with a nozzle ring with a fixed angle. The results show that the maximum efficiency angle function calculated for the variable angle nozzle ring achieves an improvement in the total efficiency of 5 % when comparing with a turbine with a fixed angle and 18 % when comparing with a vaneless turbine. The improved guidance achieved due to the variable blade angle leads to less turbine losses and therefore more mechanical energy can be extracted from the exhaust mass flow throughout all the combustion cycle but a further study should be made in order to match all the engine operations points. Notably, taking the pulsating boundary conditions into consideration, a remarkable improvement is achieved already for the fixed angle nozzle ring.

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Harson, Andrew. "A blade angle control system for large variable pitch fans." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334529.

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Austin, Jeffrey G. "Mach number, flow angle, and loss measurements downstream of a transonic fan-blade cascade." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA280907.

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Riyad, Iftekhar A. "An Analysis of Harmonic Airloads Acting on Helicopter Rotor Blades." ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2507.

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Анотація:

Rotary wing aircrafts in any flight conditions suffer from excessive vibration which makes the passengers feel uncomfortable and causes fatigue failure in the structure. The main sources of vibration are the rotor harmonic airloads which originate primarily from the rapid variation of flow around the blade due to the vortex wake. In this thesis, a mathematical model is developed for rotor blades to compute the harmonic airloads at rotor blades for two flight conditions vertical takeoff and landing, and forward flight. The sectional lift, drag, and pitching moment are computed at a radial blade station for both flight conditions. The lift at a particular radial station is computed considering trailing and shed vortices and summing over each blade. The results for airloads are obtained after considering zeroth, first, and second harmonics. The calculated results for airloads are compared to the experimental flight-test data.

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Sundberg, Johanna, Martina Lundberg, Julia Solhed, and Aikaterini Manousidou. "Two-dimensional Study of Blade Profiles for a Savonius Wind Turbine." Thesis, Uppsala universitet, Elektricitetslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-412795.

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Анотація:

A Savonius wind turbine is a self-starting vertical axis rotor. It can be designed to be compact in size and also produces less noise which makes it suitable to integrate into urban spaces such as rooftops and sign-poles. These characteristics make it interesting from a sustainability point of view, especially when aiming to increase the decentralization of electricity production. This thesis aimed to investigate the aerodynamic performance of different two-bladed Savonius profiles by varying the blade arc angle and the overlap ratio. For evaluation, the dimensionless power coefficient and torque coefficient were investigated over different tip speed ratios. The study was conducted numerically with 2D simulations in Ansys Fluent. The partial differential equations describing the characteristics of the flow, including the flow turbulence effects, were solved with the Reynolds-average Navier Stokes in combination with the k-omega SST model. A validation was performed by comparing data from simulated and experimental tests of a semi-circular profile and a Benesh profile. The investigation of the blade arc angle and overlap ratio was performed on a Modified Bach profile. The profile with a blade arc angle of 130 degrees and an overlap ratio of 0.56 generated a maximal power coefficient of 0.267 at a tip speed ratio of 0.9. This blade configuration generated the best performance of all conducted simulations in this project. However, this project contained uncertainties since simulations can never be an exact description of reality. The project was also limited by the computational power available. Nevertheless, according to the conducted simulations, it was observed that a higher blade arc angle and a larger overlap ratio seem to generate higher efficiency.
En Savonius vindturbin är en självstartande vertikalaxlad rotor som kan utformas i en kompakt design samtidigt som den producerar mindre oljud än horisontalaxlade vindkraftverk. Dagens hållbarhetssträvan i kombination med Savonius turbinens karakteristiska egenskaper gör den till ett potentiellt starkt vertyg för vindenergi. Då den kan placeras på exempelvis hustak eller skyltstolpar, utan att störa närliggande omgivning, finns det många möjliga sätt att implementera och integrera den i samhällets infrastruktur. Målet med detta projekt var att undersöka den aerodynamiska prestationen för Savoniusturbiner med två blad genom att variera bladvinkeln och överlappningsförhållandet. För att jämföra de olika profilerna användes den dimensionslösa effektkoefficienten och momentkoefficienten. Dessa koefficienter beräknades i förhållande till löptalet. Studien utfördes numeriskt med 2D-simuleringar i Ansys Fluent. De partiella differentialekvationerna som beskriver flödets egenskaper, inkluderat turbulenseffekterna, löstes med Reynolds-average Navier Stokes i kombination med k-ω SST modellen. En validering utfördes genom att jämföra data med simulerade och experimentella värden av en Semi-circular profil och en Benesh profil. Studien av bladvinkel och överlappningsförhållandet utgick från en Modified Bach profil. Den mest effektiva profilen hade en bladvinkel av 130 grader och ett överlappsförhållande på 0,56. Den genererade en maximal effektkoefficient av 0,267 vid löptal 0,9. Projektet innehöll en del osäkerheter då simuleringar aldrig kan beskriva verkligheten till fullo. Den tillgängliga beräkningskapaciteten begränsade även projektet ytterligare. Trots vissa begränsningar, visar ändå utförda simuleringar att ökad bladvinkel och ökat överlappningsförhållande genererar högre effekt.

This project was conducted within Stand up for wind and Stand up for energy.

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Russ, Thomas William. "A surface flow visualization study of boundary layer behavior on the blades of a solid-wall compressor cascade at high angles of attack." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/53161.

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Анотація:

The oil-film surface flow visualization technique was applied to circular arc compressor blades in a solid wall, high aspect ratio cascade for the purpose of describing the transition from corner stall to full blade stall, and the blade surface flow under fully stalled conditions. Photos of the visualizations for three stagger angles are presented and analyzed. A map quantitatively describing the observed boundary layer development at midspan is presented. The most interesting discovery of the work showed the suction surface flow to be essentially two-dimensional, in the geometric sense, preceding and following the transition to a fully separated flow at the leading edge. Corner stall was the observed three-dimensional mechanism prior to full stall. For fully-stalled conditions, the three-dimensional mechanism took the form of recirculating flow regions at the blade ends. Complete separation at the leading edge occurred at lower angles of attack for the higher stagger angles. Special blade oil-flow tests were conducted to evaluate Reynolds number and tip clearance effects on boundary layer development. The experimental work was done as part of a larger research program aimed at measuring and predicting the stalled performance of a compressor cascade.
Master of Science

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Lewis, Daniel Russell. "Tip clearance and angle of attack effects upon the unsteady response of a vibrating flat plate in crossflow." Thesis, Virginia Tech, 1993. http://hdl.handle.net/10919/43198.

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Анотація:

The influence of tip clearance and angle of attack upon the mid-span unsteady pressure response of a vibrating flat plate was investigated experimentally. Unsteady pressure measurements were taken for a variety of incidence angles, vibration frequencies and tip clearances over a Mach number range of 0.2 to 0.6.

It was found that changes in tip clearance had an effect on measured pressure fluctuations at higher angles of attack and larger Mach numbers. It was also observed that the amplitude of the unsteady pressure increased as the incidence angle was increased.

The plate was mechanically induced to oscillate in translation, simulating the flISt bending mode. Averaged Fast Fourier Transforms were used to determine pressure oscillation amplitudes and phase lags with respect to the plate motion.

Master of Science

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Герасимчук, Галина Андріївна, та Galina Gerasimchuk. "Обґрунтування параметрів комбінованого однодискового копача кормових буряків". Thesis, Тернопільський національний технічний університет ім. Івана Пулюя, 2011. http://elartu.tntu.edu.ua/handle/123456789/877.

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Анотація:

Робота виконана у Луцькому національному технічному університеті Міністерства освіти і науки, молоді та спорту України, м. Луцьк. Захист відбувся 3 березня 2011 р. о 1200 годині на засіданні спеціалізованої вченої ради Д.58.052.02 при Тернопільському національному технічному університеті імені Івана Пулюя за адресою: 46001, м. Тернопіль, вул. Руська, 56. З дисертацією можна ознайомитись в бібліотеці Тернопільського національного технічного університету імені Івана Пулюя за адресою: 46001, м. Тернопіль, вул. Руська, 56.
Дисертація присвячена вирішенню наукової задачі підвищення показників якості збирання кормових буряків шляхом обґрунтування параметрів комбінованого копача, виконаного у вигляді сферичного диска, встановленого під кутом атаки до напрямку його руху, у робочій зоні якого і над ним змонтовано горизонтальний вал з очисними лопатями, які закріплено на осях, повернутих відносно осі вала на деякий кут. На основі проведених теоретичних і експериментальних досліджень обґрунтовано раціональні параметри копача. Результати досліджень використовуються проектно-конструкторськими організаціями в процесі розробки КМ.
В диссертации на основании совокупности обобщенных результатов решена актуальная научная задача, которая состоит в повышении показателей качества работы выкапывающих рабочих органов кормовой свеклы путем обоснования параметров работы комбинированного однодискового копателя. В первом разделе проведен анализ литературных источников. В частности, рассмотрены классификация выкапывающих рабочих органов и очистителей головок корнеплодов кормовой свеклы, их конструкции, основные технологии сбора кормовой свеклы, а также обоснован выбор рабочего органа для проведения исследований. Во втором разделе теоретически исследовано секундные подачи примесей вороха корнеплодов и коэффициенты технологической эффективности работы копателя в зависимости от параметров копателя, характеристик корнеплодов и условий работы корнеуборочной машины. На основании анализа процесса взаимодействия очистительной лопати горизонтального вала с головкой корнеплодов получены математические модели, характеризирующие условия невываливания корнеплодов с почвы та их неповреждения, определена критическая угловая скорость вращения лопати. В третьем разделе представлено программу экспериментальных исследований, приведено перечень оборудования, приборов, разработанных опытных установок и методики проведения исследований. С учетом программы экспериментальных исследований изготовлена экспериментальная лабораторно-полевая установка комбинированного копателя кормовых корнеплодов. В четвертом разделе приведены результаты экспериментальных исследований. Установлено влияние конструктивно-кинематических параметров копателя на секундные подачи примесей вороха и основные показатели качества работы – потери, повреждения корнеплодов, остатки ботвы на головках корнеплодов. В пятом разделе определены перспективные направления усовершенствования конструкций рабочих органов копателей и основные показатели экономической эффективности использования копателя. Конструктивная новизна разработок защищена двумя патентами Украины на изобретения.
Dissertation is devoted to the scientific problem of improving indexes of quality of gathering fodder beet by grounding parameters of combined digger, designed as a spherical disc which is set due to an angle of attack to the direction of its movement in the working area of which it is mounted a horizontal shaft with scrubbing blades that are fixed on turned on defined angle axis according to axis of a shaft. It was grounded rational parameters of a digger on the basis of theoretical and experimental studies. Research results are used by design organizations in the development of RDM.

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Bouchet, Claire. "Les métaphores dans la poésie de William Blake : enjeux de traduction." Paris 3, 2004. http://www.theses.fr/2004PA030125.

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Cette étude a pour objet de montrer, mesurer et qualifier l’apport d’une approche traductive à l’herméneutique littéraire. Le champ d’étude est circonscrit à la figure particulière de la métaphore, au sein de cette partie de l’œuvre poétique de William Blake que l’on appelle les Livres Prophétiques, et à travers quatre de leurs traductions. Le repérage des références extra-textuelles, le décodage des réseaux intratextuels, l’analyse des choix de traduction selon les contraintes de la sémantique, de la syntaxe ou de la morphologie, tant de la langue de départ que de la langue d’arrivée et l’analyse des spécificités de l’écriture poétique contribuent à montrer que la traduction est une activité créatrice qui se fonde sur un travail de lecture spécifique et qui fait du traducteur un critique littéraire, un révélateur du style de l’auteur et un créateur d’œuvre littéraire
This study aims at probing, measuring and defining how the act of translating can contribute to literary analysis. It concentrates particularly on metaphors as they appear in four French translations of William Blake’s “Lambeth Books”. Translation is an activity which involves defining the cultural references of the work of art as well as the inner networks of imagery, and leads to making decisions in translating the text, according to the rules of semantics, syntax or morphology in both languages. Added to the analysis of the specificity of poetry writing, all these elements tend to show that translating is a creative activity based on a specific strategy of reading and which show how the translator is also a literary critic, the initiator into an author’s style and a creator of literary works

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Книги з теми "BLADE ANGLES"

Mike, Davis. Beyond Blade runner: Urban control : the ecology of fear. Westfield, N.J: Open Media, 1992.

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Mike, Davis. Beyond Blade runner: Urban control, the ecology of fear. Westfield, N.J. (PO Box 2726, Westfield NJ 07091): Open Media, 1992.

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Abedi, Isabel. Blöde Ziege, Dumme Gans: Alle Bilderbuchgeschichten. München: ArsEdition, 2009.

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Museum of Contemporary Art (Los Angeles, Calif.). The Blake Byrne collection. Los Angeles, Calif: Museum of Contemporary Art, 2005.

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F, Groeneweg J., and Lewis Research Center, eds. Prediction of unsteady blade surface pressures on an advanced propeller at an angle of attack. Cleveland, Ohio: Lewis Research Center, 1989.

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C, Zierke William, and United States. National Aeronautics and Space Administration, eds. The measurement of boundary layers on a compressor blade in cascade at high positive incidence angle. [Washington, D.C.]: National Aeronautics and Space Administration, 1986.

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William Blake: The gates of paradise. Toronto: Tundra Books, 2006.

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1757-1827, Blake William, ed. The Tyger, the lamb, and the terrible desart: Songs of innocence and of experience in its times and circumstance : including facsimiles of two copies. London: Cygnus Arts, 1998.

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Aborn, Allyson. Everything I do you blame on me!: A self-esteem book to help children control their anger. King of Prussia, Pa: Center for Applied Psychology, 1994.

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Nasher Museum of Art at Duke University, OSU Urban Arts Space, Wallach Art Gallery, and Lewis & Clark College (Portland, Or.). Gallery of Contemporary Art, eds. Open this end: Contemporary art from the collection of Blake Byrne. Los Angeles: The Skylark Foundation, 2014.

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Частини книг з теми "BLADE ANGLES"

Wang, Yuanyuan, Yadi He, Pengli Zhu, Lidong Zhang, and Feichao Zhao. "New Processing Method Based on Intelligently Manufacturing Blade with Multiple Space and Compound Angles." In Lecture Notes in Electrical Engineering, 647–55. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6508-9_78.

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Babu, Sushanlal, and S. Anish. "Influence of Purge Ejection Angles and Upstream Wakes/Disturbances on Low Aspect Ratio Turbine Blade Passage Aerodynamics." In Lecture Notes in Mechanical Engineering, 105–10. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-7055-9_18.

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Sudani, Jay, Rutvesh Rathod, Harsimran Kassowal, Sunny Patel, Karan Panchal, and Sodagudi Francis Xavier. "Computational Assessment of the Performance of an Air-Cooled Condenser Fan at Different Blade Pitch Angles and Speeds." In Advances in Energy Research, Vol. 1, 429–37. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2666-4_42.

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Larrissy, Edward. "Postmodern Myths and Lies: Iain Sinclair and Angela Carter." In Blake and Modern Literature, 125–45. London: Palgrave Macmillan UK, 2006. http://dx.doi.org/10.1057/9780230627444_10.

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Ma, Hui, Tong Yang, Shiyu Liu, Qi Sun, and Bangchun Wen. "Effects of Twist Angle on Rubbing Induced Vibration Responses of Blade." In Mechanisms and Machine Science, 193–204. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99270-9_14.

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Serrano-Barreto, Carlos L., Jesús Enrique Sierra-García, and Matilde Santos. "Intelligent Hybrid Controllers for the Blade Angle of Floating Wind Turbines." In 16th International Conference on Soft Computing Models in Industrial and Environmental Applications (SOCO 2021), 461–70. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87869-6_44.

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Ling, Zhang, Wen Guo-liang, and Peng Tao. "Numerical Investigation on Two Compound Angles Film Cooling of Stator Blades." In Advances in Intelligent and Soft Computing, 689–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25194-8_81.

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Shen, Wen Zhong, Martin O. L. Hansen, and Jens Nørkær Sørensen. "Determination of Angle of Attack (AOA) for Rotating Blades." In Wind Energy, 205–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-33866-6_37.

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Ranger, Christopher. "Friendly Enemies: A Dialogical Encounter between William Blake and Angela Carter." In Blake, Modernity and Popular Culture, 140–50. London: Palgrave Macmillan UK, 2007. http://dx.doi.org/10.1057/9780230210776_11.

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Rozhkov, K. E., I. A. Krivosheev, and N. B. Simonov. "Selection of Incidence Angle at Designing Blade Row of Compressors and Turbines." In Proceedings of the 4th International Conference on Industrial Engineering, 197–204. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-95630-5_21.

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Тези доповідей конференцій з теми "BLADE ANGLES"

Naresh Babu, K., A. Kushari, and C. Venkatesan. "Effect of Adjacent Blade Motion on the Aerodynamics of a Linear Cascade Blade." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68666.

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Due to the trend of increasing power and reducing weight, the fan and compressor blades of turbo machinery might be more sensitive to flutter, which must strictly be avoided in the design process. In order to increase our understanding of the flutter phenomena for fan and compressor cascades, aero-elastic investigations are essential. In the present work experiments were performed in the specifically designed Oscillating Cascade Facility to investigate and quantify the unsteady aerodynamics forces and moments acting on a blade in a linear cascade of blades when the instrumented blade is stationary and the two adjacent blades on both sides of the instrumented blade are executing torsion-mode oscillations about their mid-chord. A 5-component strain gage balance was used to measure the unsteady aerodynamic forces on the model blade. The forces were measured for six inter-blade phase angles (i.e., the phase angle between the moving blade motions at a given frequency where the central blade is stationary) at low subsonic conditions, different reduced frequencies and different stagger. The time-variant forces were analyzed and variation of lift and drag coefficients for different inter-blade phase angles and reduced frequencies were plotted. The experimental results indicate that the inter-blade phase angle had a major effect on the variation of the unsteady forces and that reduced frequency had a somewhat less significant effect. Also in order to investigate the influence of the reduced frequency and inter-blade phase angles on the global stability of the cascade and its local contributions, experiments were performed for different reduced frequencies and phase angles. At the higher inter-blade phase angles (180°) the blade remains aerodynamically stable at 0° stagger, but the stability reduces at higher stagger angles. The blade is usually unstable when the interblade phase angle is 0°. At different flow conditions, some of the inter-blade phase angles appear to be aerodynamically unstable.

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Yan, Xin, Lijie Lei, Jun Li, and Zhenping Feng. "Effect of Bending and Mushrooming Damages on Heat Transfer Characteristic in Labyrinth Seals." In ASME 2013 Turbine Blade Tip Symposium. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/tbts2013-2012.

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Using conjugate heat transfer calculations, the heat transfer in straight-through labyrinth seals with and without rub damages (bending and mushrooming damages) were numerically investigated. Firstly, the numerical methods were carefully validated on the basis of obtained experimental data. At two different sealing clearances and a range of Reynolds numbers, Nu distributions on the seal rotor and stator surfaces for the original design cases were numerically computed and compared to the experimental data. The temperature fields in the fluid and inside the solid domains were obtained to account for the heat transfers between fluid and adjacent solids. Then, a range of bending angles, wear-off ratios and mushrooming radiuses were selected to investigate the influence of rub damages on heat transfer characteristic in the labyrinth seals, and the numerical results were also compared to that of original design cases. The results show that the calculated Nu distributions are in good agreement with the experimental data at a range of Re numbers and different sealing clearances. The turbulence model has pronounced effect on the heat transfer computations for the labyrinth seal. Among the selected eddy viscosity turbulence models, the low-Re k-ω and SST turbulence models show superior accuracy to the standard k-ε and RNG k-ε turbulence models, which over-predict Nu by about 70%. Bending damage reduces Nu on the labyrinth fin whereas enhances heat transfer on the opposite smooth stator. The effect of bending angle on Nu distribution on the seal stator surface is larger than on the rotor surface. The mushrooming damage has pronounced effect on Nu distributions on both rotor and stator surfaces for the labyrinth seal. It shows that Nu distributions on the rotor and stator surfaces decreases with the increase of mushrooming radius, but increases with the increase of wear-off ratio and Re.

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KOMERATH, N., S. G. LIOU, and J. S. HYUN. "Flowfield of a swept blade tip at high pitch angles." In 29th Aerospace Sciences Meeting. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1991. http://dx.doi.org/10.2514/6.1991-704.

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Schneider, Tim, and Dragan Kožulović. "Flow Characteristics of Axial Compressor Tandem Cascades at Large Off-Design Incidence Angles." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94708.

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In a number of recent and former publications, compressor tandem blade configurations show potential to outperform single blade configurations in terms of turning, loss and operating range at high aerodynamic loading levels. However, very little insight is given into the mechanisms of flow breakdown when comparing tandem blades to single blades at large off-design incidence angles. Single blade cascades tend to fail as a result of either pressure side flow separation for high negative incidence or suction side flow separation for high positive incidence, the latter being mostly accompanied by significant increase of underturning. Tandem blade cascades are expected to show a different behavior due to the aerodynamic interaction in the blade overlapping region. Two different tandem blade configurations are examined together with their respective reference single blades, one being a recently designed and optimized tandem blade for high subsonic inlet Mach numbers, which has also been investigated in cascade wind tunnel testing. The other one is a more generic tandem blade based on NACA65 family, designed for medium inlet Mach numbers using current state-of-the-art understanding of tandem design. The mechanisms of flow breakdown are examined using quasi two-dimensional RANS simulations which are validated with test data for one of the aforementioned tandem configurations. A detailed analysis of the flow structure at heavy off-design conditions gives insight into the characteristics of tandem flow breakdown. In particular, the ability of the tandem configuration to extend the operating range to larger positive incidence is described. The shortcomings of the tandem cascade at large negative incidence are also commented. These and further conclusions can be used to improve tandem blade performance at moderate off-design conditions.

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Murugan, Muthuvel, Anindya Ghoshal, Fei Xu, Ming-Chen Hsu, Yuri Bazilevs, Luis Bravo, and Kevin Kerner. "Articulating Turbine Rotor Blade Concept for Improved Off-Design Performance of Gas Turbine Engines." In ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/smasis2016-9045.

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Gas turbine engines are generally optimized to operate at nearly a fixed speed with fixed blade geometries for the design operating condition. When the operating condition of the engine changes, the flow incidence angles may not be optimum with the blade geometry resulting in reduced off-design performance. Articulating the pitch angle of turbine blades in coordination with adjustable nozzle vanes can improve performance by maintaining flow incidence angles within the optimum range at all operating conditions of a gas turbine engine. Maintaining flow incidence angles within the optimum range can prevent the likelihood of flow separation in the blade passage and also reduce the thermal stresses developed due to aerothermal loads for variable speed gas turbine engine applications. U.S. Army Research Laboratory has partnered with University of California San Diego and Iowa State University Collaborators to conduct high fidelity stator-rotor interaction analysis for evaluating the aerodynamic efficiency benefits of articulating turbine blade concept. The flow patterns are compared between the baseline fixed geometry blades and articulating conceptual blades. The computational fluid dynamics studies were performed using a stabilized finite element method developed by the Iowa State University and University of California San Diego researchers. The results from the simulations together with viable smart material based technologies for turbine blade actuations are presented in this paper.

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Šimurda, David, Martin Luxa, Pavel Šafařík, Jaroslav Synáč, and Bartoloměj Rudas. "Aerodynamic Data for Two Variants of Root Turbine Blade Sections for a 54″ Turbine Rotor Blade." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25323.

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Aerodynamic investigations were performed on planar blade cascades representing two alternative root sections of rotor blades 54″ in length with straight fir-tree root. Each of the variants was designed for different number of blades in the rotor. This paper presents the results of measurements showing the dependency of the kinetic energy loss coefficient and the exit flow angle on the exit isoentropic Mach number and the angle of incidence. Images of the flow fields are also presented. The experimental data is analyzed to assess and document the difference between the two root section designs. Results show that requirement of straight fir tree root leading to high design incidence angles significantly limit operation range. Also in case of root sections with high exit Mach numbers a limit load conditions are an issue. In order to utilize available pressure drop blade cascade throat/pitch ratios should be kept as high as possible which favorites variant with lower number of blades and higher outlet metal angle (relative to axial direction).

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Körbächer, Heiko, and Albin Bölcs. "Steady-State and Time-Dependent Experimental Results of a NACA-3506 Cascade in an Annular Channel." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-334.

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An experimental investigation of the steady-state and time-dependent aerodynamic behaviour of a compressor cascade in a ring channel was conducted at the Laboratoire de thermique appliquée et de turbomachines (LTT) at the Swiss Federal Institute of Technology in Lausanne. The cascade consisted of 20 blades with a NACA-3506 profile, stagger angle of 40°, and solidity of 0.72 at midspan. Measurements were done for a number of incidence angles over a small range of inlet Mach numbers between ∼0.75 and ∼0.8 in order to examine the influence of an increasing angle of attack on the steady-state and time-dependent pressures. As the angle of attack increased a growing corner stall was observed at the hub and a supersonic zone appeared at the leading edge. The cascade was vibrated in bending mode with a constant amplitude at a reduced frequency of ∼0.42 at imposed interblade phase angles ranging from 0° to 324°, but also with each blade vibrating in a single blade vibration mode. The unsteady data showed that the cascade was in general damped with the minimum damping between ∼−36° to ∼+36° interblade phase angle for all examined incidence angles. The influence coefficient technique was used to identify the damping influence of each of the blades on itself (eigeninfluence) and of blades up and down the cascade (positive- and negative-sided) for different inlet incidence angles.

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Kazemifar, Farzan, Mehdi Molai, Bahar Firoozabadi, and Goodarz Ahmadi. "A Numerical Study of Geometrical Effects on the Strouhal Number of a Circular Cylinder." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-69034.

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In this paper, reducing the Strouhal number of a circular cylinder is studied numerically. Two-dimensional numerical simulations of flow over a normal circular cylinder and various modified circular cylinders are carried out using FLUENT® soft ware. Two small blades are attached to a circular cylinder and the effects of variation of the blades length and the blade angle are studied numerically. The blade angle is chosen 2α = 0°, 30°, 90°, 120° and 150°. The blades length is chosen l/d = 0.125, 0.25, 0.375. Effects of blade angles and blade lengths were studied for both 2α = 0° and 150°. Results show that increasing in blade lengths decreases the Strouhal number. Moreover, as the blade angle was increased from zero to 90°, the percentage reduction in Strouhal number decreased; however, as the blade angle was further increased from 90° to 150°, the percentage reduction in Strouhal number increased. Although the modifications studied here decrease the vortex shedding frequency they make the vortices shed from the cylinder farther and stronger hence increasing the magnitude of the fluctuating forces.

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Sathish, S., S. Seralathan, Mohan Sai Narayan Ch, V. Mohammed Rizwan, U. Prudhvi Varma, and K. Naga Madan Kumar. "Influence of converging conical hole angles on jet impingement blade cooling of gas turbine blade leading edge." In INTERNATIONAL CONFERENCE ON ADVANCES IN MATERIALS, COMPUTING AND COMMUNICATION TECHNOLOGIES: (ICAMCCT 2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0070816.

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Zhao, Zhiyuan, Xin Du, Fengbo Wen, and Zhongqi Wang. "Investigation of 3D Blade Design on Flow Field and Performance of a Low Pressure Turbine Stage." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63772.

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Анотація:

To investigate the effect of blade geometry profiling by 3D bowing and twisting independently and jointly on entropy, efficiency and performance for the turbine cascades, the paper describes the mechanism of how bowed and twisted blades affect the secondary flow. The efficiency of the turbine stage improves considerably and flow structure has been optimized by applying the bowed and twisted blade. An optimization of low pressure turbine with bowed stator has been performed using steady and transient RANS simulations. Cases with varying bow angles including both positive bow angle and negative bow angle have been discussed to show how bow angle influence the performance of rotor and stator. An optimal case with positive 18-degree bow angle was obtained. It indicates that the entropy increase rises slightly in the region near mid-span, while it reduces distinctly near the hub and shroud in the stator. In addition to the varying bow angles, further deliberate modification has been made to present a detailed study on the effect of twisted and bowed blade with different stator exit angles. Due to the varying exit flow angles of stator, the mass flow in the spanwise direction has been changed. Meanwhile, the circumferential mass-averaged efficiency in spanwise direction is different. Therefore, the mass flow changing in the spanwise direction leads to redistribution of low energy fluid in the flow passage. The variation of exit flow angles also affects secondary flow and it can be controlled actively by changing the angles. A considerable increase of efficiency has been achieved in this part of investigation. Considering the unsteady interaction of rotor and stator influenced by applying bowed and twisted stator, the flow through the LPT with relatively low aspect ratio was numerically simulated. It shows clearly how the secondary flow develops in the passage of the stage with bowed and twisted stator and proves several results achieved previously. At the same time, it shows how wakes of the stator and passage vortex develop in the rotor passage.

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