Numerical simulation of jet atomization process of swirl nozzle

Abstract

Abstract As the initial conditions of evaporative combustion, the jet atomization formed by the swirl nozzle has the characteristics of large distribution space and small atomization particle size, which is very important for the study of the jet atomization of the swirl nozzle. In this paper, the cross-scale VTD model is used to comprehensively consider the actual situation of multi-scale and multi-phase flow coupling in the atomization process. The evolution process and the breaking shape of the rotating cone liquid film during the atomization and crushing process are studied. The results show that the complete broken shape formed by the rotating cone liquid film can be divided into three areas along the axial direction: continuous liquid film, primary crushing, and secondary crushing. Among them, the appearance of irregularly distributed small holes is a significant feature of primary crushing. The sign of secondary crushing is that the liquid filaments are broken into small-scale droplet particles; after the primary and secondary crushing, the fully developed cone-shaped liquid film will appear to move up the position of the primary crushing cavity and reduce the scope. At the same time, the initial position of the secondary crushing will move up.