静电喷雾液滴破碎的理论边界条件研究

Study on Theoretical Boundary of Charged Droplet Breakup in Electrospray

静电喷雾技术是通过将燃油荷电来改善燃油雾化质量的喷雾技术。该技术有望在较低压力下获得与高压喷射相当甚至更优的雾化质量,从而降低内燃机燃油喷射系统的成本,或与高压喷射相结合从而获得更好的雾化质量。对静电喷雾液滴的二次雾化破裂机理进行了建模分析,以韦伯数We为依据对影响液滴破裂雾化的几种因素作了计算分析,得到了荷电液滴雾化破裂的理论边界条件,即临界荷质比与液滴粒径的关系,以及相关影响因素与临界荷质比的量化关系。

Electro-spray is  a spray atomization  improvement  technique by using the electrostatic  force. This technique has  a potential of improving spray atomization  at lower injection pressure than conventional injection pressure and reduce the cost of fuel injectionsystem dramatically. Another potential application  is to achieve fine spray by assisting high-pressure  injection system with electrostatic atomization device. A modeling analysis for the secondary breakup of  charged fuel droplets was  given. Using Weber number as criterion, several  factors that influence  the breakup process are also analyzed and the theoretical boundary for electro-breakup was obtained, they are the relationship between  the critical charge-mass ratio and diameter of the droplets, the quantitative relationship between influencing factors and critical charge-mass ratio.