| Abstract:In order to clarify the characteristics of single gasoline droplet impacting on different substrates, a single droplet impingement system was designed, and the effects of different substrates on impingement results were compared and studied. The results show that single gasoline droplet impacting on a dry wall is easy to deposit to form a gasoline film. The presence of the attached gasoline film will promote a crown jet splash phenomenon when the droplet hits the wall again, causing secondary droplets. The thinner the gasoline film is, the more violent the splash is and the shorter the duration of the splash is. Compared with the viscosity of a silicone oil film, the thickness has a greater influence on the morphological evolution of the gasoline droplet and silicone oil film after collision. When single gasoline droplet impacts on pure silicone oil films of different thicknesses and viscosities, there is no secondary droplets splash. However, the gasoline droplet will deposit and penetrate any silicone oil film and diluts the silicone oil. There is bowl splash before the dilution and crown jet splash after the dilution. The number of secondary droplets increases with the increase of the amount of gasoline in any silicone oil film. The secondary droplets contain silicone oil. The Rioboo model can better predict the variation law of the spreading factor when the dimensionless time is less than 1, but it can not predict accurately when the dimensionless time exceeds 1. |