顺桨风力机塔叶干涉翼型非稳气动力时频特性  

TIME-FREQUENCY CHARACTERISTICS OF UNSTEADY AERODYNAMIC FORCES FOR FEATHERED WIND TURBINE AIRFOIL UNDER TOWER BLADE INTERACTION

作　　者：唐新姿[1] 何文双 郭颜威 彭锐涛[1] Tang Xinzi;He Wenshuang;Guo Yanwei;Peng Ruitao(School of Mechanical Engineering and Mechanics,Xiangtan University,Xiangtan 411105,Hunan,China)

机构地区：[1]湘潭大学机械工程与力学学院,湖南湘潭411105

出　　处：《力学学报》2023年第3期588-598,共11页Chinese Journal of Theoretical and Applied Mechanics

基　　金：湖南省自然科学基金(2021JJ30676);国家自然科学基金(51975504)资助项目。

摘　　要：由于风力机叶片与塔筒流场相互干涉,实际气动力与理想情况存在较大差异,这种干涉作用造成的气动力差异给叶片与塔筒结构可靠性带来不可忽视的影响.以翼型DU91-W2-250为研究对象,采用瞬态数值分析与本征正交分解方法,考虑叶片和塔筒流场相互干涉作用,分析顺桨工况翼型非稳气动力时频特性及其影响规律,量化不同雷诺数下塔叶相对位置及几何参数对气动力均值、波动幅度和频率的影响程度,通过流场模态能量分布形态分析,揭示流场干涉对气动力的影响机制.结果表明,翼型气动中心至塔筒几何中心的垂直距离、水平距离以及塔筒直径相对于翼型弦长的无量纲参数y^(*),x^(*)和D^(*)对气动力均有不同程度影响,其中y^(*)对升阻力系数均值影响最大,对频率无明显影响,y^(*)绝对值越大,C_(l)均值越接近单翼型C_(l)值,y^(*)绝对值越小升阻力系数波动幅度越大,y^(*)从-12增大到12,升力系数均值最小值为-0.48,最大值为1.16;x^(*)减小和D^(*)增大,反向阻力均值增大,波动幅度增大,波动频率略有下降,当x^(*)小于临界值5时,带塔翼型阻力均值反向;在计算范围内,带塔翼型升力系数均值相对于单翼型升力系数最大偏差为-221.94%,其最大波动幅度相对单翼型升力系数为28.0%,带塔翼型阻力系数均值最大偏差为-1189.3%,其最大波动幅度为121.1%;受塔筒前方高压区影响,翼型流场存在明显对称脉动激励,造成气动力偏离和波动.Due to the interference between the wind turbine blades and the flow field of the tower,the actual value of the aerodynamic force is quite different from the theoretical value.The difference in aerodynamic force caused by this interference has a non-negligible impact on the reliability of the blade and tower structure.Taking the airfoil DU91-W2-250 as the research object,based on the transient numerical analysis and proper orthogonal decomposition method,considering the interaction between the blade and the tower flow field,the time-frequency characteristics and the influence law of unsteady aerodynamic forces for the feathering airfoil are analyzed,the influence degree of the relative position of the tower blade and the geometric parameters on the mean value of aerodynamic force,the fluctuation range and frequency at different Reynolds numbers are quantified,and the influence mechanism of flow field interference on aerodynamic force are revealed through the analysis of flow field modal energy distribution.Results show that,the vertical and horizontal distances from the aerodynamic center of the airfoil to the geometric center of the tower as well the tower diameter relative to the chord length of the airfoil,which are defined as the dimensionless distance parameters y^(*),x^(*)and D^(*),have varying degrees of influence on the aerodynamic force.Among which,y^(*)has the greatest influence on the mean value of lift and drag coefficients,but has no obvious influence on the frequency.The greater the absolute value of y^(*)is,the closer the mean value of C_(l)is to the C_(l)value of a single airfoil.The smaller the absolute value of y^(*)is,the greater the fluctuation amplitude of lift and drag coefficients is,and y^(*)increases from−12 to 12,the minimum value of average lift coefficient is−0.48,and the maximum value is 1.16.When x^(*)decreases and D^(*)increases,the mean reverse drag force increases,the fluctuation amplitude increases,and the fluctuation frequency decreases slightly.When x^(*)is less than the cr

关 键 词：风力机翼型 气动力 时频特性 本征正交分解 数值分析 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]