高速水流空化区和空蚀区掺气特性的试验研究  

Experimental study of aerated characteristics in cavitation region of high velocity flow

作　　者：董志勇[1] 吕阳泉[1] 居文杰[1] 蔡新明[1] 丁春生[1] 

机构地区：[1]浙江工业大学建筑工程学院,杭州310032

出　　处：《水力发电学报》2006年第4期62-65,28,共5页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金资助项目(50279048)的部分内容

摘　　要：本文用先进的量测仪器在浙江工业大学水力学实验室直流式水洞中分别对高速水流空化区、空蚀区的掺气特性进行了较为系统的试验研究。实测了空化区掺气前后压力的变化,分析了压力波形的可压缩流特征以及马赫数与压缩比的关系;实测了空蚀区不同掺气浓度的时均压力分布,分析了压力随掺气浓度的变化及背压对空蚀的影响;提出减免空蚀的最低掺气浓度与流速的关系,比较了掺气前后水流的空化数。The aerated behaviours in cavitation region of high velocity flow through the non-circulating water tunnel are investigated by using the advanced experimental facilities in the hydraulics laboratory at Zhejiang University of Technology. Variations in pressure with and without aeration in cavitation region are measured and the compressible characteristics of pressure waveforms and relation between Mach number and compression ratio are analyzed;the time-averaged pressure profiles of different air concentration in cavitation erosion region are measured, the variations of the pressure with air concentration and effects of between least air concentration to prevent cavitation with and without aeration in cavitation region are co back pressure on cavitation erosion are analyzed; the relations erosion and flow velocity are proposed; the cavitation numbers mpared

关 键 词：水力学 掺气减蚀 压缩波 压力 最低掺气浓度 

分 类 号：TV131.34[水利工程—水力学及河流动力学]