自振空化射流冲击压力脉动特性实验研究  

An experimental study on impact pressure characteristics of self-resonant cavitating jets

作　　者：李根生[1] 沈忠厚[1] 周长山[1] 张德斌[1] 易灿[1] 

机构地区：[1]石油大学(华东)石油工程学院,山东东营257061

出　　处：《水动力学研究与进展（A辑）》2003年第5期570-575,共6页Chinese Journal of Hydrodynamics

基　　金：国家杰出青年科学基金(50125413);国家自然科学基金重点项目(50234030)

摘　　要：　自振空化射流是利用瞬态流和水声学原理调制而成的一种新型射流,本文研究了自振空化射流在常压及围压下的压力脉动特性及其参数影响规律。研究结果表明,在实验条件下各种风琴管喷嘴的压力脉动存在最优喷距,无因次最优喷距都在8～14范围内,风琴管自振空化射流的冲击压力脉动峰值和脉动幅度分别比普通喷嘴高37%和24%;最大脉动幅度并不出现在射流轴心,而是偏离轴心一段径向距离;随着围压的增加,脉动峰值压力随着喷距的衰减速度明显加快,而脉动频率基本不随围压、压降和喷距的变化而变化,保持在1.38KHz左右。Selfresonant cavitating jet is a kind of modulated jet with significant impact pressure fluctuations and cavitation effects. The study was conducted to investigate the jet pulse characteristics and the effects of parameters, including standoff distance, radial distance, nozzle pressure and ambient pressure. The optimal dimensionless standoff distances of the studied organpipe nozzles are among 8～14 times of the nozzle diameter. The imapct pressure fluctuations of selfresonant cavitating jets are about 24 and 37 percent higher than that of the conventional jet at the same nozzle pressure. The maximum amplitude of the pressure pulse did not appear strictly at the jet axis, and under ambient pressure, the decreasing rate of peak pulse pressure is obviously accelerated with the increasing of standoff. The frequency of selfresonant cavitating jet basically does not change with the variation of ambient pressure, pressure drop and standoff distance.

关 键 词：自振空化射流 冲击压力脉动特性 实验研究 喷嘴 风琴管 

分 类 号：TP602.2[自动化与计算机技术—控制理论与控制工程] O358[自动化与计算机技术—控制科学与工程]