基于流固耦合的叶片颤振分析

摘要

Blade flutter can cause serious damage, and it is a part of the study of fluid solid coupling. In order to predict and analyze blade flutter, exhaustive analysis of fluid solid coupling and the process of numeric simulation are presented here. And fluid solid coupling simulation is accomplished by using ANSYS and CFX in numerical calculation of structure and flow field, with a coupling bench which can transfer fluid pressure and structure displacement.Under different inlet velocities and attack angles, blade and fluid coupling is simulated. And blade displacement response is acquired to determine whether flutter will occur or not. Simulation results indicate that flutter frequency is close to natural frequency of the blade, inlet velocity and attack angle are important factors which influence the aeroelasticity stability.%研究航空发动机性能问题,叶片颤振过程属于流固耦合问题,为了对叶片颤振进行预测和分析,保证发动机稳定,在提出对流固耦合原理和求解过程进行分析的基础上,采用 ANSYS 进行结构计算,CFX 进行流场计算,并利用两者间的数据交互平台传递流场压力载荷和结构位移数据,实现了流固耦合数值仿真计算.在不同来流速度及攻角下进行叶片和流场的耦合计算,根据得到的叶片振动位移响应判断叶片是否会发生颤振.计算结果表明,颤振频率与叶片低阶固有频率一致,证明来流速度和攻角是影响叶片气动弹性稳定性的重要因素,并可做为叶片颤振的预测依据.