本文主要研究燃油喷入气体中的雾化过程。在假设雾化是由于气液之间气动相互作用导致液体射流表面不稳定波增长并最终导致细小液滴形成的基础上，把燃油雾化过程分为两个阶段：１次雾化和２次雾化。前者只发生在气液交界面上，主要由不稳定波增长和破碎所引起；后者则发生在气液渗混区，受１次雾化后形成的液滴在气体中进一步破碎和聚合控制。文章最后分析了某些参数对雾化的影响，并把计算得到的喷雾贯穿距离和ＳＭＤ同实验进行了比较。 This paper mainly studies the atomization process of fuel injected into gas. Based on the assumption that atomization is due to the aerodynamic interaction between gas and liquid resulting in the instability of the liquid jet and ultimately resulting in the formation of fine droplets, the fuel atomization process is divided into two stages: one atomization and two Atomization. The former only occurs at the gas-liquid interface and is mainly caused by the growth and fragmentation of unstable waves. The latter occurs in the gas-liquid permeation zone. The droplets formed after one atomization are further broken down in the gas and controlled by polymerization . In the end, the influence of some parameters on atomization is analyzed, and the calculated spray penetration distance and SMD are compared with the experiment.