PSE方法在后部加载叶栅绕流稳定性分析及转捩预测中的应用

采用数值求解与实验测量相结合的方法,分析后加载叶栅绕流的稳定性并预测转捩.推导出正交曲线坐标系下三维扰动波的抛物化稳定性方程,在风洞实验中测量叶栅叶片表面的静压分布,并结合测量结果对设计叶栅的流动稳定性进行特征值分析.分析结果表明:(1)后加载叶型能有效推迟转捩,提高叶栅的变冲角特性;(2)当冲角变化时叶顶流动稳定性的变化最显著,负冲角流动稳定,正冲角流动最不稳定.

Application of PSE method into aft-load cascade boundary stability analysis and transition prediction

The stability and transition of aft-load blade was analyzed and predicted by combining numerical calculation and experimental measurement.Parabolized stability equation(PSE) of 3D disturbance wave was deducted under orthogonal curvilinear coordinates.The static pressure distribution on blade surface was measured in wind tunnel test,and this result was used for analysis of blade's flow stability.The results show that:(1) aft-load blade can delay efficiently the transition and enhance the variable incidence of blade;(2) the positive incidence is most unsteady and negative incidence is most steady in the event of significant change of flow characteristics of blade tip.