摘要
在水洞中进行了水中圆柱形腔流激振荡的研究，水洞中的试验结果与空气中的结果进行了对比，得到了圆柱形腔在空气和水两种介质中流激振荡特性的共同点和差别。文中还根据腔底多层结构计算了腔底反射系数，然后导出水中多层腔底结构腔内的驻波共振频率计算关系式，并由此提出了用于计算任意弹性底圆柱腔驻波共振频率的图解算法及具有广泛意义的图解图，算得的驻波共振频率与试验值比较接近。还进行了流引起腔中流噪声的均方压力随流速变化的测量和分析工作，给出了均方根压力随流速变化的关系。
The flow-induced oscillation of cylindrical cavities is studied in water tunnel, and is compared with the oscillation in air. The reflection coefficient of the bottom of the cavity is calculated. The bottom is considered as a multi-layer planar structure. The formulae for calculating the frequency of standing wave resonance of the cavity are expressed. A monogram for calculation of frequencies of standing wave resonance of cylindrical cavity with any elastic bottom is presented. The calculated frequencies are coincident with experimental results for a cylindrical cavity with piston-bottom made with 3-layered plates- In addition, the RMS's of pressure in the cavity induced by water flow with different speed are measured and analysed. The RMS of wide-band pressure is approximately proportiQnal to speed square.
出处
《中国造船》
EI
CSCD
北大核心
1996年第3期36-47,共12页
Shipbuilding of China
基金
国家自然科学基金
国防科研课题
