撞击流内液滴碰撞的后续发展行为  

Subsequent development of droplet collision in impinging stream

作　　者：吴鸽平[1] 龚俊[1] 杜敏[1] 陈威[1] 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2016年第5期525-529,547,共6页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51306075);江苏省博士后科研资助计划项目(1302024B);江苏省自然科学基金资助项目(BK20130520);江苏省高校自然科学研究面上项目(13KJB470002)

摘　　要：为了探索撞击流内液滴碰撞后续发展行为,建立了正确反映液滴碰撞及后续发展的冷态理论模型.利用所建模型模拟了同轴对置气液两相撞击流中液滴碰撞导致的融合聚并或二次雾化过程,进而对2个喷嘴之间液滴的粒径分布进行了研究,分析了进口液滴粒径、速度、黏度以及液滴碰撞角度等对撞击流中液滴粒径分布的影响规律.结果表明:进口液滴粒径越小、黏度越大,液滴发生碰撞后聚合的概率越大;进口液滴速度较小时,液滴发生碰撞后全部聚合,继续增大进口液滴的速度,液滴碰撞后二次雾化的概率增大;在相同条件下,液滴发生斜碰时二次雾化的概率比发生正碰时要大.To investigate the subsequent development of drop impact in impinging stream , the theoreticalmodel was established to correctly reflect the droplet collision and subsequent development. The proposed model was used to simulate the coalescence or the secondary atomization by droplet collision in coaxiallyopposed two gas-liquid impinging stream. The particle size distribution of droplets between two nozzleswas theoretically investigated , and the effects of size , velocity , viscosity and impact angle on droplet sizedistribution were analyzed. The simulation results show that the smaller the droplet size is, the greater theprobability of collision coalescence is. The greater the viscosity is, the greater the probability of collisioncoalescence is. Droplets occur coalescence when the velocities are small. With the increasing of velocity , the probability of secondary atomization is increased. Under the same conditions , when droplets occur oblique impact , the probability of secondary atomization is larger than that for direct impact.

关 键 词：液滴碰撞 气液两相撞击流 融合聚并 粒径分布 数值模拟 

分 类 号：O359[理学—流体力学]