腔深对水中空腔流激振荡影响的实验研究  

Experimental investigation of depth effects on low speed flow-induced cavity oscillation in water

作　　者：章文文 何琳[1,2] 徐荣武[1,2] ZHANG Wenwen;HE Lin;XU Rongwu(Institute of Noise and Vibration,Naval University of Engineering,Wuhan 430033,China;National Key Laboratory on Ship Vibration and Noise,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学振动与噪声研究所,湖北武汉430033 [2]海军工程大学船舶振动噪声重点实验室,湖北武汉430033

出　　处：《华中科技大学学报（自然科学版）》2021年第6期92-97,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(11904407)。

摘　　要：为探究腔深对水中空腔流激振荡的影响,设计了一种可连续调节深度的空腔装置,并在大口径循环水管路系统中开展低速空腔流激振荡实验.基于分别布置在空腔上游、腔底及下游三点传感器的脉动压力测量结果,分析水中空腔流激振荡随腔深的变化特征.结果表明:随着腔深的增加,空腔自持振荡频率有所降低,而振荡幅值有随腔深增大而增大的趋势,腔深对空腔流激振荡的影响主要体现于深长比<1的浅腔流动;同时,空腔深度增加会使得空腔自持振荡更加稳定;可为进一步揭示不可压缩空腔流自持振荡和流激噪声机理提供参考.A cavity device with continuously adjustable depth was designed to explore the depth effects on flow-induced cavity oscillation in water,and a low-speed flow-induced oscillation of cavity was carried out in a large-diameter circulating water pipeline system.Based on the pulsing pressure measurement results of three sensors at the upstream,bottom and downstream of the cavity,the characteristics of the flow-induced oscillation of the water cavity with the cavity depth were analyzed.The results show that as the cavity depth increases,the cavity self-sustained oscillation frequency decreases,and the oscillation amplitude tends to increase with cavity depth. The influence of cavity depth on flow-induced cavity oscillation is mainly reflected in shallow cavity flow,which the D/L<1. At the same time, the increase of cavity depth will make the cavity self-sustained oscillation more stable. The findings provide a useful exploration for further revealing the mechanism of self-sustaining oscillation and flow-induced noise of incompressible cavity flow.

关 键 词：空腔流 流激振荡 脉动压力 腔深 开孔腔 

分 类 号：O427.5[理学—声学]