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通过CFD仿真和试验的方法研究了夹气喷嘴的瞬态喷雾特性并验证了喷雾仿真模型的准确性.利用Fluent软件在不同环境背压和不同喷气压力的条件下进行了瞬态喷雾的CFD仿真计算,同时利用高速摄影机拍摄定容弹内部的喷雾形态,以及通过激光粒径测试仪对大气环境下的喷雾进行燃油液滴SMD的测量.结果表明:喷嘴出口处高速流出的压缩气体与燃油发生强烈的耦合,并于下游处产生强烈的涡环结构;试验中环境背压减少0.2MPa时所增加的平均贯穿速率是喷气压力增加0.2MPa时的3.62倍;喷雾平均贯穿速率的试验结果与仿真结果的平均误差为9.94%;试验得到的喷嘴外围的喷雾平均索特直径与仿真平均索特直径的平均误差为4.33%.
The transient spray characteristics of the air-jet nozzle were studied by CFD simulation and test and the accuracy of the spray simulation model was verified.The CFD simulation of transient spray was carried out by Fluent software under different ambient back pressure and different jet pressure , And at the same time using high-speed camera to take a picture of the spray pattern inside the fixed volume bomb and measuring the droplet SMD of the fuel spray in the atmospheric environment by the laser particle size tester.The results show that the compressed gas and fuel Strong coupling and a strong vortex ring structure in the downstream. The average penetration rate increased 0.2 times higher than that when the pressure was increased by 0.2MPa in the experiment; 3.62 times when the jet pressure increased by 0.2MPa. The experimental results and simulation The average error of the results was 9.94%. The average error between the average Soth diameter and the simulated average Soth diameter of the nozzle outside the experiment was 4.33%.