闪急沸腾条件下的二甲醚气爆雾化理论研究  

Theoretical Research on Micro-Explosion Atomization of Dimethyl Ether under Flash Boiling Condition

作　　者：张鹏[1] 张煜盛 

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074

出　　处：《内燃机工程》2010年第1期27-31,共5页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(50676036)

摘　　要：为深入研究气泡微爆对燃油雾化的影响,利用线形稳定性理论推导了可描述气泡生长过程中的不稳定扰动所需要满足的色散方程,并对该方程进行了无量纲化处理,以此对二甲醚气泡生长的不稳定性进行了研究,建立了新的油滴破碎准则。研究结果表明:气泡Weber数和气泡的体积分数越大,气泡越不稳定;油滴破碎时间随气泡生长速度的增大或者初始油滴/气泡半径比的减小而缩短。Based on the theory of linear stability analysis, a dispersion equation, which can describe the development of disturbance during the growth of bubble, was derived, and a dimensionless form of the dispersion equation and a new breakup criterion of droplet were established. In order to understand the microexplosion atomization mechanism of dimethyl ether （DME） spray under flash boiling condition , the instability of bubble growth was analyzed. The results indicate that the bubble becomes more unstable with the increase of bubble Weber number and bubble void crease of initial radius ratio of droplet to bubble, fraction; with the increase of bubble growth rate or the de the breakup time of droplet becomes shorter.

关 键 词：内燃机 闪急沸腾 二甲醚 不稳定性 微爆 雾化 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]