Abstract: In order to better understand the flow condition inside the air atomizing nozzle, a threedimensional model of the nozzle is established by using modeling software. The transient process of the flow inside the nozzle model is numerically simulated by large eddy simulation in Fluent software under the condition of air pressure of 0.031 MPa and liquid flow of 10 L/h, 15 L/h and 20 L/h respectively. By extracting and analyzing the pressure, velocity and gas volume fraction parameters on the central axis and different sections of the nozzle, the flow characteristics of the flow field inside the nozzle are obtained, which provided a theoretical basis for improving the atomization quality of the air atomizing nozzle as well as the research and development of the design.

Key words: Air atomizing nozzle; Large eddy simulation; The internal flow field; Fluent software

摘要： 为了更加深入了解空气雾化喷嘴内部的流动状况，首先通过建模软件建立了喷嘴的内 部三维模型，然后在空气入口压力为 0.031 MPa，液体流量为 10 L/h、15 L/h、20 L/h 的工况 下利用 Fluent 软件中的大涡模拟模型对喷嘴的内部流动的瞬态过程进行数值模拟。通过对喷 嘴中心轴线上和不同截面上的压力、速度和气相体积分数等参数进行提取分析，以此得到喷 嘴内部流场的流动特征，并为改善空气雾化喷嘴的雾化质量以及研发设计提供理论依据。

关键词: 空气雾化喷嘴；大涡模拟；内部流场；Fluent 软件