| The study of droplet impact on liquid film is conducive to foster the performance of airborne spray cooling and boost the application and development of the aviation industry, based on its considerable influence on heat transfer and morphological changes of liquid film. On the premise of different thicknesses of liquid film, horizontal distances of double droplets and gravity accelerations, the research focuses on the evolution process and characteristics of liquid film morphology, explores the development law of the central jet after the double droplets impact on the liquid film, and analyzes the heat transfer characteristics of the liquid film and the high-temperature wall, with a rollout of simulating the simultaneous impact of double droplets on the liquid film using CLSVOF method. The results show that the thicker the liquid film is, the slower the central jet rises, the later the jet breaks, and the liquid film retraction has a significant impact on wall heat transfer. The larger the horizontal distance between the two droplets is, the slower the central jet rises，increasing the distance does not change the trend of changes in wall heat flux. And the greater the gravity acceleration is, the slower the central jet rises, the earlier the jet breaks, and the effect of gravitational acceleration on wall heat transfer is relatively small. |
