空腔的流激振荡及其声激励抑制方法的数值模拟

Numerical Simulations of Flow Induced Oscillation in Cavity and Its Suppression by Sound Excitation

通过数值模拟，研究了矩形空腔在亚音速外流下的流激振荡问题。采用显式ＭａｃＣｏｒｍａ－ｃｋ二步预估校正有限差分格式，求解二维雷诺平均非定常Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程；并用Ｃｅｂｅｃｉ－Ｓｍｉｔｈ代数紊流模型作适当修正来模拟紊流效应，对有、无前缘声激励两种情况的空腔流场作了数值模拟，计算的振荡频率及振荡幅值都与实验结果基本符合，并且较好地模拟出了声激励对流场的影响。

In this paper the flow induced oscillation in a cavity is studied numerically.Cavity flows both with and without sound excitation are studied by solving the 2 D time dependent Reynolds averaged Navier Stokes equations using explicit predictor corrector difference algorithm of Mac Cormack.Effects of turbulence are simulated via Cebeci Smith turbulence mode with relaxation modification.Good agreement is obtained,compared the calculated oscillatory frequency and amplitude with experimental results.The effect of sound excitation is simulated correctly.