摘要
空化效应是高压均质破碎的重要作用机理。为考核不同射流均质条件下空化效应的改变,依据流体动力学及空化理论,对空化效应导致射流噪声进行了分析、测算,并对乙醇—水为二元组分载料介质的射流均质过程中两者的相关性进行了试验验证。理论分析表明,通过添加低沸点载料介质可以明显强化空化效应,二元组分载料介质中的乙醇摩尔分数xA从0趋近1时,空化效应呈先强后弱的规律,推断射流噪声的声压量级及频谱特性也会发生相应变化,射流噪声的实测结果与理论分析基本一致。结果表明,通过检测射流噪声,可以方便、间接地考查射流均质过程中空化效应的改变,评价空化效应潜在的能量特点。
Cavitation is the important mechanism of high pressure homogenization. Based on fluid dynamics and cavitation theory,correlation of cavitation and jet noise change during high pressure jet homogenizing process were analyzed and estimated to evaluate cavitation. Experimental investigation of cavitation and jet noise was carried out by using different ratio ethyl alcohol-water mixture solution. Theoretical analysis indicated that cavitation could be strengthened through changing the constitutional ratio of solution. While mole fraction of ethyl alcohol xA in ethyl alcohol-water mixture solution changes from 0 close to 1,cavitation degree during ultra-high pressure jet homogenizing process increased at first and then decreased,and average sound pressure and frequency spectrum of jet noise changed correspondingly. Experimental results are basically consistent with theoretical analysis,so jet noise change can be used to evaluate cavitation conveniently and indirectly.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2011年第1期170-174,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
北京工商大学青年教师科研启动基金资助项目(QNJJ2010-29)
北京市属高等学校人才强教计划资助项目(PHR201106110)
关键词
空化效应
试验
频谱分析
射流噪声
cavitation
experiments
spectrum analysis
high pressure jet noise
