三维透平叶片扭转颤振问题的流固耦合数值研究  

NUMERICAL ANALYSIS OF 3D TURBINE BLADE'S TORSIONAL FLUTTER BY FLUID-STRUCTURE COUPLING METHOD

作　　者：金琰[1] 袁新[1] 

机构地区：[1]清华大学热能工程系,北京100084

出　　处：《工程热物理学报》2004年第1期41-44,共4页Journal of Engineering Thermophysics

基　　金：国家重点基础研究专项经费资助项目(No.G1999022306);国家自然科学基金(No.50076019)

摘　　要：颤振,尤其是失速颤振是引起叶轮机械安全事故的重要原因之一。由于叶片颤振的复杂性,过去人们一直采用半经验的方法研究叶片的颤振。本文发展了一套更精确的流固耦合计算方法,并用这种算法研究了三维透平叶片的扭转颤振。在模拟大负攻角下的颤振时发现,传播失速响应频率向固有频率靠近是振动发散的一个重要判据。通过计算得出了压比和攻角对颤振影响的特性曲线,它不但可用于判断流体激振的稳定性,而且可以研究颤振的强度。Flutter, especially stall flutter is the main reason that lead to turbomachinery's safety problem. Turbomachinery's flutter is used to be studied by empirical method because of its complicity. A high accuracy fluid-structure coupling numerical method is developed in the paper. A turbine blade's torsional vibration is studied by the present method. During the numerical simulation of flutter at large negative attack angle, it is found that the frequency of the propagating stall will move to the natural frequency gradually, which is an important signal of the flutter. The figures, which indicate the influence of the attack angle and pressure ratio to the fluid, are obtained, from which we can learn not only the stability of the vibration, but also the vibration's intensity.

关 键 词：叶轮机械 三维非定常Navier-Stokes方程 流固耦合 大攻角 颤振 

分 类 号：O35[理学—流体力学]