非轴对称端壁成型及其对叶栅损失影响的数值研究

根据叶栅非轴对称端壁成型的基本原理，探讨了非轴对称端壁成型的技术，利用三角函数构建了叶栅非轴对称端壁的型面，对5种不同端壁的叶栅进行了数值模拟，并采用三维时均可压缩N-S方程组求解方法，对构建的非轴对称端壁的跨音速直列叶栅进行了数值研究．结果表明：采用非轴对称端壁可有效降低叶栅二次流损失，所建立的非轴对称端壁成型方法效果比较明显；成型过程中单峰幅值控制函数要明显优于双峰函数，单峰幅值控制函数中最大幅值约占5％叶高为宜，此时计算结果显示在叶栅128％轴向弦长处总压损失降低了约4．7％。

Non-Axisymmetric Turbine End Wall Profiling and Numerical Investigation of Its Effect on the Turbine Cascade Loss

Based on the three-dimensional design principles of controlling the local static pressures by means of streamline curvature, a three-dimensional design methodology of the turbine non-axisymmetric end wall profiling was presented. Numerical investigations of the flow characteristics in the turbine cascades with different non-axisymmetric end wall profiling were conducted. Numerical results show that the unimodal function of the control function in the design methodology is better than the bimodal function. Moreover, the appropriate maximum amplitude is about 5% of span and the total pressure loss at 128% axial chord length can reduce by 4.7 %.