非定常流场分析结果向结构载荷压力场转化问题的解决

在研究前排静子叶片尾流对后排转子叶片振动的影响时．一个很大的难题就是如何将尾流场作用下的转子叶片通道内的非定常流场转化为适于振动响应分析的结构载荷压力场的形式，并引入有限元分析。在本文中，首先将转子叶片通道进口处的尾流参数进行傅立叶分解，然后分别对各阶谐波作用下的转子叶片通道内的非定常流场进行计算，将其叠加，得到整个非定场流场的解。这样，在进行振动谐响应分析时，各阶谐波作用下的载荷压力场实际上就是其对应的各阶非定常压力场。同时，通过一定的简化，把非定常气动分析结果转化为适于ANSYS谐响应分析的加载形式，从而成功地把结构载荷压力场引入了有限元分析。

Solving the Problems of Transforming Unsteady Flow Analysis Results to Load Pressure Field

In analyzing the influence of the wake flow due to the stator blades of previous stage applied on the rotor blades of the following stage, a very difficult question is how to transform aerodynamic force in rotor blade passage due to wake flow, to the form of load pressure field of structure for an analysis by finite element. In this paper, wake at the inlet of the rotor blade passage has been decomposed into Fourier series at first, and then the unsteady flow in the blade passage will be calculated under each order of harmonic. Finally, a complete solution of the unsteady flow is achieved by adding them all. Thus,load pressure field under each order of harmonic is actually the corresponding order of unsteady fluid field. In this paper, the analysis results of unsteady aerodynamics is transformed in the form will fit for load applying of ANSYS harmonic response analysis to successfully introduce load pressure field into finite element analysis.