流激励下腔口导边处集结涡脱出的数值模拟

Numerical Simulation of Shedding-eddies on the Leading-edge of Cavity by Flow

各类腔型结构的流激振荡机理与声辐射是多年来许多学者研究并试图治理的一类噪声问题。Rossiter 提出腔口导边集结涡激发流体的自持振荡的模型。但 Heller 等人采用水台显示和纹影技术研究时没有发现导边处有如 Rossiter 所假说的集结涡脱出现象,从而对 Rossiter 的激励模型提出了疑问。本文用改进的有限分析解法,数值计算证实在一定条件下腔口导边有集结涡脱出现象。指出了Rossiter 和 Heller 的结果不一致的可能原因。文中还讨论了角点边界条件的处理等问题。

In this paper, for the study of the mechanism of flow -induced oscillation and radiation sound of cavity, the problem of shedding concentrating-eddies at leading edge of cavity is nu- mericaUy simulated by the finite analysis method modified by the authors. The Heller's conclu- sion is dissonant with Rossiter's. The probable cause is pointed out in this paper.