液滴内空泡生长控制机理及影响因素的研究

发布时间：2017-12-27 21:15

  本文关键词：液滴内空泡生长控制机理及影响因素的研究　出处：《高校化学工程学报》2016年06期 　论文类型：期刊论文

  更多相关文章： 液滴 空化气泡 生长 控制机理 数值模拟

【摘要】：在超空化燃油射流使得喷雾中部分燃油分裂液滴内含有空化气泡;空化气泡的生长对液滴的分裂与雾化具有重要的影响。研究基于VOF方法对燃油液滴内空化气泡的生长过程进行了数值模拟,结合R-P方程对单液滴内空化气泡生长控制机理及影响因素进行了分析。结果表明,单液滴内空化气泡的生长可以按控制机理划分为表面张力控制阶段、综合竞争阶段和惯性力控制阶段。在第I生长阶段,空泡的生长主要受表面张力的控制作用;在第II生长阶段,空泡的生长主要受表面张力、惯性力及黏性力三者的综合作用;在第III生长阶段,空泡的生长主要受惯性力的控制作用。最后,利用建立的数值计算模型对表面张力系数、液体黏度及液体密度对液滴内气泡生长过程的影响进行了分析。
[Abstract]:In the super cavitation fuel jet, some cavitation bubbles exist in some of the fuel splitting droplets, and the growth of cavitation bubbles has an important influence on the droplet splitting and atomization. Based on the VOF method, the growth process of cavitation bubbles in fuel droplets was numerically simulated. Combined with R-P equation, the growth mechanism and influencing factors of cavitation bubbles in single droplets were analyzed. The results show that the growth of cavitation bubbles in single liquid droplets can be divided into surface tension control stage, comprehensive competition stage and inertial force control stage according to the control mechanism. In the growth stage of I, the growth of the cavity is mainly controlled by the surface tension. In the growth stage of II, the growth of the cavity is mainly affected by the three functions of the surface tension, the inertia force and the viscous force. In the III growth stage, the growth of the cavity is mainly controlled by the inertia force. Finally, the effect of the surface tension coefficient, liquid viscosity and liquid density on the bubble growth in the droplet was analyzed by the established numerical model.
【作者单位】： 北京交通大学机械与电子控制工程学院;
【基金】：国家自然科学基金(51276011,51606006) 中国博士后科学基金(2016M591061) 中央高校基本科研业务费专项资金(2016JBM049)
【分类号】：O35
【正文快照】： 1前言空化现象广泛存在于船舶、水轮机、生物医疗及发动机等化工领域。柴油发动机的燃油射流空化可以分为部分空化(空化初生)和超空化[1];部分空化主要指空化气泡在喷孔内即溃灭和消失的现象,而超空化则是指空化气泡随燃油一起从喷孔喷出的现象。超空化射流对燃油雾化具有重要，

本文编号：1343219