Abstract: In order to realize numerical simulation of impinging atomization of two jets and to investigate the effects of jet velocity and impinging angle on atomization characteristics, the GPU (Graphics Processing Unit) accelerated moving particle semi-implicit (MPS) method is carried out to simulate the atomization process. The maximum acceleration ratio of the GPU accelerated code is 16, which proves the validity of GPU acceleration. GPU accelerated code is applied to simulate the impact atomization of double jets under typical working conditions. The numerical simulations successfully capture the formation of liquid films, the breaking of liquid films into liquid filaments and the breaking of liquid filaments into droplets. The simulated liquid film breakup length and atomization angle are in good agreement with the experimental results, and the errors are 11.7% and 0.5%, respectively, which proves the validity of the GPU accelerated MPS method in the simulations of atomization problem. The parametric analysis of the effects of jet velocity and impact angle on breakup length, atomization angle and Sauter diameter of primary atomized droplets is carried out. The results show that the increase of impact angle or jet velocity will lead to the decrease of breakup length of liquid film, the increase of atomization angle and the decrease of Sauter diameter of primary atomized droplets.

Key words: Atomization;Impact of two jets;MPS method;GPU acceleration;Atomization angle;Sauter diameter

摘要： 为实现双股射流撞击雾化过程的高效数值求解并探究射流速度和撞击角度对雾化特性的影响规律，实现了移动粒子半隐式方法（MPS）GPU加速的双股射流撞击雾化模拟。GPU加速程序的最大加速比为16，取得了较好的加速效果。将GPU加速MPS方法应用于典型工况下的双股射流撞击雾化模拟，成功捕捉到了多尺度的液膜形成、液膜破碎成液丝继而破碎成液滴的瞬态过程，模拟得到的液膜破碎长度及雾化角度与试验较为吻合，误差分别为11.7%和0.5%，验证了GPU加速MPS方法在双股射流撞击雾化问题中处理能力。参数化分析了射流速度和撞击角度对液膜破碎长度、雾化角度及一次雾化液滴索尔直径的影响。结果表明撞击角度增加或者射流速度增加均会导致液膜破碎长度减小、雾化角度增加、一次雾化液滴索尔直径减小。

关键词: 雾化;双股射流撞击;移动粒子半隐式法;GPU加速;雾化角;索尔直径