跨超声速开式空腔流激振荡模态预估分析  

Prediction and analysis of flow oscillation modes inside open cavities at transonic or supersonic speeds

作　　者：杨党国[1,2] 祝静[1,3] 李建强[2] 梁锦敏[2] 张诣[2] 

机构地区：[1]中国空气动力研究与发展中心空气动力学国家重点实验室,绵阳621000 [2]中国空气动力研究与发展中心高速空气动力研究所,绵阳621000 [3]重庆大学通信工程学院,重庆400030

出　　处：《空气动力学学报》2014年第3期369-375,共7页Acta Aerodynamica Sinica

基　　金：国家自然科学基金(11272335);气动预研基金(513130402)

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。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.

关 键 词：开式空腔 流激振荡 模态预估 物理机制 预估方法 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]