流线型突出异型腔的流激振荡和声辐射特性的研究

A study on characteristics of flow-induced oscillation and sound radiation of streamlined protuberant special cavities

本文进行了对流线型突出异型腔的流激振荡和声辐射特性的研究，得出了三个结论．第一，在水中和低Ｍａｃｈ数情况下，腔中存在两种振荡模式：腔的本征振荡和腔的流体动力振荡．第二，给出了流体动力振荡的Ｓｔｒｏｕｈａｌ数和Ｍａｃｈ数之间的关系式．第三，在水中，在低Ｍａｃｈ数情况下，流激振荡的总声级和流速平方成正比增加的关系式．

The characteristics of flow-induced oscillation and sound radiation of streamlined protuberant special cavities had been studied by us. Three important results are obtained:first,in water and low Mach number, two oscillating modes in the cavity are natural oscillation and hydrodynamic oscillation of the cavity present; second,the eguation between strouhal number and Mach number of hydrodynamic oscillation is given ;third,in waterand low Mach number,the increment of general sound level of flow-induced oscillation isdirectly proper-nonal to the square of flow speed