Simulation study on the effect of jet parameters on the jet flow of a swirl nozzle

Abstract

As the initial condition of evaporative combustion, the jet atomization formed by the swirl nozzle has the characteristics of large distribution space and small atomization particle size, so it is very important to study the jet atomization of the swirl nozzle. Previously, most scholars used the interface tracking method to study the primary breakage of the rotating conical liquid film, but there were few studies on the secondary breakage of the liquid film. This paper aims to use the cross-scale VTD model, comprehensively consider the actual situation of multi-scale and multi-phase flow coupling in the atomization process and discuss the changing characteristics of the conical liquid film during the crushing process in combination with different jet parameters. The smaller the viscosity of the liquid, the better the atomization effect, the smaller the primary crushing area and the more severe the secondary crushing; the axial velocity has a great influence on the surface wave structure, with the increase of the axial velocity, the surface wavelength also increases; the jet velocity. The impact on the distribution of the crushing area is small, but it has a greater impact on the severity of the secondary crushing.