Numerical simulation of binary diesel droplet collision process
1. Hubei Key Laboratory of Advanced Technology for Automotive Components， Wuhan University of Technology， Wuhan， Hubei 430070， China； 2. Hubei Collaborative Innovation Center for Automotive Components Technology， Wuhan University of Technology， Wuhan， Hubei 430070， China
Abstract： To investigate the physical process of diesel droplet collision during engine spraying, the models of two diesel droplet collision with the same size were established based on the volume of method (VOF), and the calculation model was verified using existing experiment data. The numerical simulations of droplet centering and the eccentric collision processes were carried out, and the WeB diagrams of three collision results and their regional distributions were obtained. The energy conversion mechanism occurred during the collision was discussed. The results show that the critical We number for the convergence and separation of centroid collision is 17.3, and the critical We number for the separation and fragmentation is 92.0. Compared with the centroid collision, the rotational motion during the eccentric collision causes the critical Weber number of aggregation and separation to follow the collision. The change of parameter B shows a trend of increasing with latter decreasing.
