基于鼓泡-引射耦合的柴油初次雾化  

Primary Atomization of Diesel Based on Bubble-Ejection Coupling

作　　者：董新宇 方振昌 李佳奇 唐新程 吕钊 乔信起[1] 孙春华 Dong Xinyu;Fang Zhenchang;Li Jiaqi;Tang Xincheng;LüZhao;Qiao Xinqi;Sun Chunhua(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Marine Diesel Engine Research Institute,Shanghai 201023,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]中国船舶集团有限公司第七一一研究所,上海201203

出　　处：《燃烧科学与技术》2024年第1期43-52,共10页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(52006136,91741122);国际科技合作专项资助项目(2017YFE0130800).

摘　　要：针对斯特林发动机小负荷燃油雾化不良问题,提出了基于鼓泡-引射耦合的雾化方式.基于VOF(Volume of Fluid)仿真研究了鼓泡喷嘴内气液流态,并依据时间线性稳定性分析,对射流液膜失稳和破碎进行数学描述,建立了鼓泡-引射耦合下的初次雾化模型.分析了气液质量比RGL(gas-liquid mass ratio)、负荷对初次雾化的影响,并与传统雾化方式比较.结果表明:增大RGL会促进射流失稳、减小液滴粒径.相较于传统雾化方式,鼓泡-引射耦合下小负荷索特平均直径SMD减小约62%,雾化质量显著提高.Aiming at poor atomization under a low load in the Stirling engine,an atomization method based on bubble-ejection coupling was proposed.Based on the VOF(Volume of Fluid)model,the air-liquid flow in the bubbling nozzle was studied numerically.According to temporal stability analysis,the instability and breakup of liquid sheet were mathematically described,and the model of primary atomization under the bubble-ejection coupling was established.The effects of RGL(gas-liquid mass ratio)and load on primary atomization were analyzed and compared with those by the traditional atomization method.The results showed that increasing RGL promotes liquid sheet instability and decreases droplet diameter.Compared with the traditional atomization method,SMD(Sauter mean diameter)at bubble-ejection coupling decreases by about 62%,and the atomization quality is significantly improved.

关 键 词：鼓泡-引射耦合 初次雾化 射流失稳 气液质量比 索特平均直径 

分 类 号：TK11[动力工程及工程热物理—热能工程]