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以水平轴风力机为研究对象分析其叶片大幅值气动弹性动态响应问题.基于非线性欧拉梁模型和风力机叶片动态入流、动态失速气动力模型进行气动弹性建模.气弹方程的动态平衡求解采用Newton-Raphson迭代,分别通过牛顿下山法和同伦沿拓法这两种数值手段改善其迭代收敛性,并对这两种算法的有效性进行比较,结果表明同伦沿拓法的收敛性相对较好.以两种典型的水平轴风机为算例,在额定工作状态以及某些极端风况下计算叶片动态响应.根据叶片根部弯矩载荷幅值定义系统是否达到临界稳定状态,并针对关停状态的风机研究了叶片临界风速与来流方向角的关系.结果表明,某些极端风况和工作状态下,风机叶片根部弯曲载荷较大,相应临界稳定的风速较低.
Aeroelastic dynamic response of blade with large amplitude is analyzed with horizontal axis wind turbine.Aeroelastic model is built based on nonlinear Eulerian beam model and dynamic inflow of wind turbine blade and dynamic stall aerodynamic model.The dynamic equilibrium of aeroelastic equation The Newton-Raphson iterative method is used to solve the problem, and the iterative convergence is improved by the Newton-Raphson method and the homotopy method respectively. The comparison between the two algorithms shows that the convergence of the Homomorphic extension method The two kinds of typical horizontal axis fans are taken as an example to calculate the dynamic response of the blade under the rated working condition and some extreme wind conditions.According to the amplitude of the blade root moment load definition whether the system reaches the critical steady state and The relationship between the critical wind speed and the flow direction angle was studied for the fans with shut-off condition. The results show that the wind turbine blade has a large bending load at the root and a relatively low critical wind speed under some extreme wind conditions and working conditions.