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Analysis of Near-Wake Deflection Characteristics of horizontal axis wind turbine Tower under Yaw State

Energy Engineering 2021年第6期118卷 1627-1640页

作者： Zhen Liu Jianwen Wang Fuzhong Bai Caifeng Wen Yunchao Du School of Energy and Power Engineering Inner Mongolia University of TechnologyHohhot010051China Key Laboratory of wind Energy and Solar Energy Utilization Technology Ministry of EducationInner Mongolia University of TechnologyHohhot010051China School of Mechanical Engineering Inner Mongolia University of TechnologyHohhot010051China

The yaw of the horizontal axis wind turbine results in the deflection of the wake flow field of the *** reasonable layout of wind farm can reduce the power loss of the downstream wind turbine generators due to the blocking effect of the upstream wake flow and increase the output power of the whole wind ***,there is still much space for further *** this paper,experimental research is conducted on the near-wake deflection characteristics of wind turbine tower under yaw state,expecting the effect of throwing away a brick in order to get a *** the low-turbulence wind tunnel test,regarding the most unfavorable position where the rotating blades coincide with the tower,Particle image velocimetry(PIV)technology is used to test the instantaneous velocity field and output power and analyze experimental data at four different yaw angles,different inflow velocities and ***,in order to quantitatively analyze the laws on wake deflection,the radon transformation is used to analyze the velocity contour for calculating the wake direction angle,and the results show high *** comprehensive experimental results indicate that the near-wake flow field of the tower obviously deflects towards a side in the horizontal *** the increase of the yaw angle,the deflection angle of the wake flow field further increases,and the recovery of wake velocity *** closer to the blade root,the more complex the flow is,and the influence of the blade on the near wake of the tower is gradually *** change laws on the wake direction angle with the yaw angle and the blade spanwise direction are *** experiment in this paper can provide guidance for layout optimization of wind farm,and the obtained data can provide a scientific basis for the research on performance prediction of horizontal axis wind turbine.

关键词： horizontal axis wind turbine yaw tower near-wake

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Design and Parametric Investigation of horizontal axis wind turbine

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Journal of Shanghai Jiaotong university(Science) 2018年第3期23卷 345-351页

作者： ABBAS Zulkarnain ABBAS Saqlain BUTT Zubair PASHA Riffat Asim School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Mechatronics Engineering University of Engineering and Technology Taxila Chakwal 48800 Pakistan Department of Mechanical Engineering University of Engineering and Technology Taxila Taxila 47080 Pakistan

This research focuses on design and calculations for the horizontal axis wind turbine to fulfill energy demands at small scales in Pakistan. This is the design to produce about 5 kilowatts of electricity to share the load of average home appliances. Area chosen for this research is Pasni, Balochistan in Pakistan to build the wind turbine for electricity. Design values are approximated by appropriate formulas of wind energy design. In current research, turbine blade profile is designed by blade element momentum(BEM) theory. Warlock wind turbine calculator is used to verify the design parameters like wind speed, tip speed ratio(TSR) and efficiency *** of wind speed, wind power, TSR, pitch angle, blade tip angle, number of blades, blade design and tower height on power coefficient are analyzed in this research. Maximum power coefficient is achieved at a designed velocity of 6 m/s. Design analysis is also performed on simulation software ANSYS Fluent. It is observed that designed velocity parameter of this research is very suitable for the turbine blade, so blade designing is perfect according to wind speed range.

关键词： horizontal axis wind turbine Warlock wind turbine calculator planetary gear box

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Computational Fluid Dynamics Analysis of Multi-Bladed horizontal axis wind turbine Rotor

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World Journal of Mechanics 2020年第9期10卷 121-138页

作者： Nasim A. Mamaghani Peter E. Jenkins Department of Mechanical Engineering University of Colorado Denver CO USA

The principal objective of this work was to investigate the 3D flow field around a multi-bladed horizontal axis wind turbine (HAWT) rotor and to investigate its performance characteristics. The aerodynamic performance of this novel rotor design was evaluated by means of a Computational Fluid Dynamics commercial package. The Reynolds Averaged Navier-Stokes (RANS) equations were selected to model the physics of the incompressible Newtonian fluid around the blades. The Shear Stress Transport (SST) k-ω turbulence model was chosen for the assessment of the 3D flow behavior as it had widely used in other HAWT studies. The pressure-based simulation was done on a model representing one-ninth of the rotor using a 40-degree periodicity in a single moving reference frame system. Analyzing the wake flow behavior over a wide range of wind speeds provided a clear vision of this novel rotor configuration. From the analysis, it was determined that the flow becomes accelerated in outer wake region downstream of the rotor and by placing a multi-bladed rotor with a larger diameter behind the forward rotor resulted in an acceleration of this wake flow which resulted in an increase the overall power output of the wind machine.

关键词： Computational Fluid Dynamics horizontal axis wind turbine Multi-Bladed Rotor Aerodynamic Torque

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The Effects of Turbulence Intensity and Tip Speed Ratio on the Coherent Structure of horizontal-axis wind turbine Wake:A wind Tunnel Experiment

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Energy Engineering 2022年第6期119卷 2297-2317页

作者： Yuxia Han Jianwen Wang Xin Li Xueqing Dong Caifeng Wen School of Energy and Power Engineering Inner Mongolia University of TechnologyHohhot010051China Key Laboratory of wind Energy and Solar Energy Utilization Technology Ministry of EducationInner Mongolia University of TechnologyHohhot010051China Power Research Institute Inner Mongolia Electric Power Group Co.Ltd.Hohhot010020China

The evolution laws of the large-eddy coherent structure of the wind turbine wake have been evaluated via wind tunnel experiments under uniform and turbulent inflow *** spatial correlation coefficients,the turbulence integral scales and power spectrum are obtained at different tip speed ratios(TSRs)based on the time-resolved particle image velocity(TR-PIV)*** results indicate that the large-eddy coherent structures are more likely to dissipate with an increase in turbulence intensity and ***,the spatial correlation of the longitudinal pulsation velocity is greater than its axial counterpart,resulting into a wake turbulence dominated by the longitudinal *** an increase of turbulence intensity,the integral scale of the axial turbulence increases,meanwhile,its longitudinal counterpart *** to an increase in TSR,the integral scale of axial turbulence decreases,whereas,that of the longitudinal turbulence *** analyzing the wake power spectrum,it is found that the turbulent pulsation kinetic energy of the wake structure is mainly concentrated in the low-frequency vortex *** dissipation rate of turbulent kinetic energy increases with an increase of turbulence intensity and the turbulence is transported and dissipated on a smaller scale vortex,thus promoting the recovery of wake.

关键词： horizontal axis wind turbine coherent structure turbulence integral scale TR-PIV spatial correlation

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wind Tunnel Study on wind and Turbulence Intensity Profiles in wind turbine Wake

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Journal of Thermal Science 2011年第2期20卷 127-132页

作者： Takao MAEDA Yasunari KAMADA Junsuke MURATA Sayaka YONEKURA Takafumi ITO Atsushi OKAWA Tetsuya KOGAKI Division of Mechanical Engineering Mie University National Institute of Advanced Industrial Science and Technology

In recent years, there has been a rapid development of the wind farms in Japan. It becomes very important to investigate the wind turbine arrangement in wind farm, in order that the wake of one wind turbine does not to interfere with the flow in other wind turbines. In such a case, in order to achieve the highest possible efficiency from the wind, and to install as many as possible wind turbines within a limited area, it becomes a necessity to study the mutual interference of the wake developed by wind turbines. However, there is no report related to the effect of the turbulence intensity of the external flow on the wake behind a wind turbine generated in the wind tunnel. In this paper, the measurement results of the averaged wind profile and turbulence intensity profile in the wake in the wind tunnel are shown when the turbulence intensity of the external wind was changed. The wind tunnel experiment is performed with 500mm-diameter two-bladed horizontal axis wind turbine and the wind velocity in wake is measured by an I-type hot wire probe. As a result, it is clarified that high turbulence intensities enable to the entrainment of the main flow and the wake and to recover quickly the velocity in the wake.

关键词： horizontal axis wind turbine Wake wind profile Turbulence intensity Power output

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Criterion of aerodynamic performance of large-scale offshore horizontal axis wind turbines

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Applied Mathematics and Mechanics(English Edition) 2010年第1期31卷 13-20页

作者：程兆雪李仁年杨从新胡文瑞 Lanzhou University of Technology Institute of Mechanics Chinese Academy of Sciences

With the background of offshore wind energy projects, this paper studies aerodynamic performance and geometric characteristics of large capacity wind turbine rotors （1 to 10 MW）, and the main characteristic parameters such as the rated wind speed, blade tip speed, and rotor solidity. We show that the essential criterion of a high- performance wind turbine is a highest possible annual usable energy pattern factor and a smallest possible dimension, capturing the maximum wind energy and producing the maximum annual power. The influence of the above-mentioned three parameters on the pattern factor and rotor geometry of wind turbine operated in China＇s offshore meteoro- logical environment is investigated. The variation patterns of aerodynamic and geometric parameters are obtained, analyzed, and compared with each other. The present method for aerodynamic analysis and its results can form a basis for evaluating aerodynamic performance of large-scale offshore wind turbine rotors.

关键词： offshore wind energy project horizontal axis wind turbine rotor aerody-namic design annual usable energy pattern factor power coefficient wind turbine rotor,wind turbine blade

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