直流自击式喷嘴雾化特性研究

Research on atomization performance of jet impinging nozzle

直流自击式喷嘴广泛应用于液体火箭发动机喷注器,但对于其雾化机理及特性的研究基本上都是建立在冷态试验和发动机热试车的基础之上。从喷嘴射流的受力分析着手,建立了射流破碎的物理模型,计算中考虑了影响该型喷嘴雾化特性的主要因素,并与相关实验结果进行了对比分析,说明了该物理模型具有一定的参考价值。该模型可以在燃烧流场计算时作为雾化初始条件使用。

Jet impinging nozzle is widely used in the injector of liquid rocket engine. The study for its atomization mechanism and performance is mainly based on cool-state experiment and hot test of engine. Proceeding from the force analysis on the nozzle jet, the physical model for jet break is established in this paper. The main factors to affect atomization characteristics of the nozzle were taken into account in calculation. By comparison of the results from the related tests, the conclusion that the model is valid for conference was obtained. The model can be used as a initial condition for calculation of the atomization flow-field.