关键词: 喷雾；初次碎裂；射流模型

Abstract: Spray atomization is a process in which liquid enters into a gas environment through a nozzle, and it is broken down into droplets through the interaction of gas and liquid, which involves complex energy exchange, momentum exchange and heat transfer process. Fuel atomization is an important link in the combustion process of internal combustion engine. Good atomization effect can promote the full mixing of fuel particles and air, so as to improve the thermal efficiency of combustion, and then improve the power performance, economy and emission of internal combustion engine. Due to the different physical structure of the spray liquid through the nozzle, the shape of the jet formed is also different. The main jet forms include plane jet, cylindrical jet and annular jet. In this paper, the three kinds of jet forms are studied, and the deep penetration analysis is carried out from the mechanism of the jet fragmentation. By introducing the physical equation and the theory of the surface wave of the jet, the liquid jet phenomenon is transformed into a mathematical model, and the key factors affecting the atomization effect are explored, thus promoting the development of the spray discipline.

Key words: Spray; Primary fragmentation; Jet model