径流式透平叶轮内部正冲角工况下的三元分离流动特性分析

ANALYSIS OF THREE-DIMENSIONAL SEPARATED FLOWS IN A RADIAL INFLOW TURBINE IMPELLER UNDER A POSITIVE INCIDENCE CONDITION

应用Ｅｕｌｅｒ分离模拟方法，对叶轮内部正冲角工况下的三元分离流动进行了预测．文中简述了采用Ｅｕｌｅｒ方程模拟分离流动的基本思想和作者发展的数值方法；示出了叶道内部分离流场及其流动特性，分析了相应的分离流型及旋涡运动规律；探讨了正冲角工况下叶轮内流分离的机理。

In this paper,three-dimensional separated flows in a radial inflow trubine impeller under a positive incidence condition is predicted by using Euler solver of separated flow simulation。The basic idea to simulate separated flows with Euler equations and the method proposed bythe authors are briefly described,and the calculated results of the internal flow field and thedistributions of flow parameters are shown in detail.The separated flow pattern and its verti-cal flow motion are presented schematically,and the mechanism of the internal flow separa-tion under the positive incidence condition is discussed。