【摘要】 在混合欧拉-拉格朗日框架下，对液气密度比为312、空气入口马赫数为0.2和0.35以及液体射流和空气主流的动量通量比为180的直射式喷嘴的横向射流一次雾化进行了数值模拟研究。针对低液气密度比下一次雾化同时受液体湍流和空气动力学影响，提出将一次雾化模化为先经历湍流驱动雾化再迅速经历空气动力学修正的方法，发展了一次雾化模型。模拟结果表明液滴直径在y/D大于30后与实验有一定差别外，液滴直径和液滴速度分布与实验基本一致，模拟射流轨迹与实验经验关系式相比偏低。更多还原

【Abstract】 A numerical simulation study is conducted in a hybrid Euler-Lagrange framework to investigate the transverse jet primary atomization of a direct injection nozzle with a liquid-to-air density ratio of 312, air inlet Mach numbers of 0.2 and 0.35, and a momentum flux ratio of 180 between the liquid jet and the air main stream. For primary atomization under low liquid-to-air density ratio affected by both liquid turbulence and aerodynamics, the primary atomization is modeled as experiencing turbulence-driven atomization first and then rapidly undergoing aerodynamic corrections, and a primary atomization model is developed. Under the newly developed primary model, the droplet diameter and droplet velocity distribution are basically consistent with the experiment except that the droplet diameter differs somewhat from the experiment after y/D is greater than 30, and the simulated jet trajectory is lower compared with the experimental empirical relations.更多还原