基于物理机制的风力发电高塔系统风场模拟
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摘要
为了准确确定作用于桨叶和塔体的风荷载,研究了基于物理机制的风力发电高塔系统风场模拟问题.依据随机过程的随机函数描述,提出了基于物理机制的旋转Fourier互谱,有效地考虑了桨叶旋转效应和桨叶上不同点风速之间的相关性.然后,对旋转Fourier谱(随机Fourier谱)作逆Fourier变换,实现了桨叶(塔体)的风场模拟.最后,结合典型的1.25 MW三桨叶变桨距风力发电高塔系统,进行了纵向风速场数值仿真研究.算例表明,该算法可以准确地模拟给定风环境的风力发电高塔系统脉动风速时程.
In order to determine exact wind loads of the blades and the tower,wind field simulation of wind turbine systems is investigated.Based on the random function description of stochastic processes,the crossrotational Fourier spectrum based on the physical mechanism is proposed to consider the rotating effect and the correlation of two different wind velocities on the blades.Then,wind velocities on blades(or the tower) are generated through the inverse Fourier transformation of the rotational Fourier spectrum(or the random Fourier spectrum).Finally,an example involving simulation of longitudinal turbulent wind field of a 1.25MW wind turbine system is investigated.The result shows that the proposed algorithm is of high accuracy.
In order to determine exact wind loads of the blades and the tower,wind field simulation of wind turbine systems is investigated.Based on the random function description of stochastic processes,the crossrotational Fourier spectrum based on the physical mechanism is proposed to consider the rotating effect and the correlation of two different wind velocities on the blades.Then,wind velocities on blades(or the tower) are generated through the inverse Fourier transformation of the rotational Fourier spectrum(or the random Fourier spectrum).Finally,an example involving simulation of longitudinal turbulent wind field of a 1.25MW wind turbine system is investigated.The result shows that the proposed algorithm is of high accuracy.
引文
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[8]李杰,张琳琳.脉动风速功率谱与随机Fourier幅值谱的关系研究[J].防灾减灾工程学报,2004,24(4):363.LI Jie,ZHANG Linlin.A study on the relationship betweenturbulence power spectrum and stochastic Fourier amplitudespectrum[J].Journal of Disaster Prevention and MitigationEngineering,2004,24(4):363.
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[10]李杰.工程结构随机动力激励的物理模型[R].上海:同济大学土木工程学院建筑工程系,2008.LI Jie.Physical stochastic models for the dynamic excitationsof engineering structures[R].Shanghai:Tongji University.Department of Building Engineering,2008.
[11]李杰,张琳琳.实测风场的随机Fourier谱研究[J].振动工程学报,2007,20(1):66.LI Jie,ZHANG Linlin.Research on the random Fourierspectrum of observational wind[J].Journal of VibrationEngineering,2007,20(1):66.
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[14]Simiu E,Scanlan R H.Wind effects on structures:anintroduction to wind engineering[M].New York:JohnWiley,1978
[15]艾晓秋.基于随机地震动模型的地下管线地震反应及抗震可靠度研究[D].上海:同济大学建筑工程系,2005.AI Xiaoqiu.Stochastic earthquake model-based research onseismic responseand reliability of underground pipelines[D].Shanghai:Tongji University.Department of BuildingEngineering,2005.
[2]Schueller G I,Shinozuka M.Stochastic methods in structuraldynamics[M].Dordrecht:Martinus Nijhoff Publishers,1987.
[3]Iannuzzi A,Spinelli P.Artificial wind generation and structuralresponse[J].Journal of Structural Engineering,ASCE,1987,113(12):2382.
[4]Naganuma T,Deodatis G,Shinozuka M.ARMA model fortwo-dimensional process[J].Journal of EngineeringMechanics,ASME,1987,113(2):234.
[5]Yamada M,Ohkitani K.Orthonormal wavelet analysis ofturbulence[J].Fluid Dynamics Research,1991(8):101.
[6]Kitagawa T,Nomura T.A wavelet-based method to generateartificial wind fluctuation data[J].Journal of wind engineeringand industrial aerodynamics,2002,90:943.
[7]李杰,陈建兵.概率密度演化方程——历史、进展与应用[R].上海:同济大学土木工程学院建筑工程系,2009.LI Jie,CHEN Jianbing.Probability density evolutionequation—history,development and application[R].Shanghai:Tongji University.Department of BuildingEngineering,2009.
[8]李杰,张琳琳.脉动风速功率谱与随机Fourier幅值谱的关系研究[J].防灾减灾工程学报,2004,24(4):363.LI Jie,ZHANG Linlin.A study on the relationship betweenturbulence power spectrum and stochastic Fourier amplitudespectrum[J].Journal of Disaster Prevention and MitigationEngineering,2004,24(4):363.
[9]贺广零,李杰.风力发电塔基于物理机制的旋转Fourier谱[R].上海:同济大学土木工程学院建筑工程系,2008.HE Guangling,LI Jie.Rotational Fourier spectrum of windturbine systemsbased on physical mechanism[R].Shanghai:Tongji University.Department of Building Engineering,2008.
[10]李杰.工程结构随机动力激励的物理模型[R].上海:同济大学土木工程学院建筑工程系,2008.LI Jie.Physical stochastic models for the dynamic excitationsof engineering structures[R].Shanghai:Tongji University.Department of Building Engineering,2008.
[11]李杰,张琳琳.实测风场的随机Fourier谱研究[J].振动工程学报,2007,20(1):66.LI Jie,ZHANG Linlin.Research on the random Fourierspectrum of observational wind[J].Journal of VibrationEngineering,2007,20(1):66.
[12]World Meteorological Organization.Meteorological aspects ofthe utilizationof wind as an energy source[R].WMOTechnical Note No.175 World Meteorological Organization,Geneva 1981.
[13]Dragt J B.The spectra of wind speed fluctuations met by arotating bladeand resulting load fluctuations[C]∥Proceedingsof European Wind Energy Conf 1984.Hamburg:[s.n],1984:453-459.
[14]Simiu E,Scanlan R H.Wind effects on structures:anintroduction to wind engineering[M].New York:JohnWiley,1978
[15]艾晓秋.基于随机地震动模型的地下管线地震反应及抗震可靠度研究[D].上海:同济大学建筑工程系,2005.AI Xiaoqiu.Stochastic earthquake model-based research onseismic responseand reliability of underground pipelines[D].Shanghai:Tongji University.Department of BuildingEngineering,2005.
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