中文摘要：

以 Rossiter 和 Heller 的开式空腔流激振荡物理机制与模态预估分析方法为基础，采用量纲分析方法，对描述腔体流激振荡特性的参数进行无量纲处理后进行了分析，并提出了一种新的激振频率预测半经验公式中常数值选取方法，通过风洞试验结果和国外文献结果进行验证，表明该方法基本可行。

英文摘要：

Unsteady flow characteristics and complex flow-field structures are main phenemena as tran-sonic or supersonic speed flow past open cavities.Physical mechanism and rational predicted method of flow-oscillations in open cavities remains as a research hotspot for years.Many explanations on the flow-oscilla-tion in the open cavities are proposed now and then.The method presented by Rossiter is the most feasible, which indicates a theory model for sound occurrence and feed-back in the open cavities.The method recuenes that some vortices are generated from flow separation in shear-layer over the open cavity,then the vortices move to the rear region of the cavity at some velocity,and impingement of the vortex and the rear-wall of the cavity occurs.Some sound waves spread abroad to the cavity fore-wall,which induces some new vortices generation,and the vortices shed,move and impinge on the cavity rear-wall.New sound waves occur. Therefore,this paper presents some analysis of the parameters describing flow-oscillations based on non-di-mension analysis method according to predicted method on self-sustained flow-oscillation modes in open cavi-ties.A new selected method on the constant value in Rossiter′s and Heller′s semi-experience formula is pres-ented.The result indicates that the method is feasible by comparing with wind-tunnel experimental result and overseas references.