一种跨音速叶栅流场分析系统

本文建立了一种工程实用的跨音速叶栅流场分析系统,可进行跨音速叶栅无粘绕流和无粘流-边界层迭代计算。叶栅无粘绕流的计算以Denton拟流向“相对差分”方法为基础,y向采用松驰线性插值算法,所形成的解法能保证以较少的网点获得较准确的结果。边界层的计算采用积分方法,并考虑了紊流边界层的分离问题,文中还介绍了无粘流-边界层的耦合方式。应用本文方法对国内外多种压气机和涡轮叶栅进行了计算分析,所得结果与实验的吻合程度较好,因此,所提出的叶栅流场分析系统,可望为工程设计上实用的计算手段。

AN ANALYSTS SYSTEM FOR TRANSONIC FLOW IN CASCADE

A Practical analysis system for predicting inviscid blade-to-blade flow and coupled inviscid-boundary layer flow in transonic cascade is presented in this paper. Generally, an analysis system should be as convenient and inexpensive as possible in use. For this purpose, a faster and simpler algorithm using central difference scheme is developed. The difference method adopts a relaxed linear interpolation technique in the y direction combined with the "opposed-difference scheme"proposed by Denton in the quasi-streamline direction. This makes it possible for the algorithm to obtain accurate flow parameters on the blade surface with less mesh points.We found that the scheme can be stable in any case if the relaxation coefficient is greater than one. For calculation of boundary layers over blade surfaces,an integral method which can treat turbulent separating flows is studied. The coupling method of inviscid flow with boundary layer flow is also given in this paper. Several computed results of transonic flows in cascades show good agreement with experimental data. It is anticipated that this analysis system will provide a useful tool for engineering design.