摘要
基于自激振荡脉冲喷嘴结构及其射流空化特性,建立了射流雾化过程中的液滴高密度区域和低密度区域破碎模型,分析了空化特性对自激振荡射流液滴破碎的影响,得到了影响自激振荡脉冲喷嘴空化特性的主要因素。研究结果表明:自激振荡脉冲射流呈周期性变化的空化特性使喷嘴出口形成超空化,出口处射流低密度区域形成一次雾化,而高密度区域则以液滴二次雾化形式破碎,增强喷嘴空化强度有利于射流雾化;自激振荡脉冲射流系统频率、喷嘴出口锥角以及射流进口压力都影响喷嘴的空化效果。
Based on the self-oscillating pulse jet nozzle structure and cavitation characteristics,it established the breakup model of high density and low density regions during the jet atomization process of droplets. Studied the effect of cavitation characteristics on the self-oscillating jet breakup,and obtained the main factors which affected the cavitation characteristics of the self-oscillating pulse nozzle. The results show that： the cavitation characteristic s of self-excited oscillation pulse jet changes periodically,and leads to the formation of super-cavitation at the nozzle outlet. The droplets in lower density region of the outlet form primary atomization,while the high-density region forms secondary atomization,and increasing the nozzle cavitation intensity is beneficial to the jet atomization. The frequency of the pulse jet system,the outlet cone angle and inlet pressure have influence on the cavitation effect.
出处
《机械设计与制造》
北大核心
2015年第7期16-19,共4页
Machinery Design & Manufacture
基金
国家自然科学基金(51405352)
高等学校博士学科点专项科研基金(20124219120001)
武汉市青年科技晨光计划(2013070104010022)
关键词
自激振荡
喷嘴
数值模拟
空化
雾化
Self-Excited Oscillation
Nozzle
Numerical Simulation
Atomization
Cavitation
