ADN基液体推进剂射流撞网雾化特性的试验研究

摘要

为了提升液体推进剂的雾化效果,采用二硝酰胺铵(ADN)基无毒空间推进剂,在近喷孔区施加金属网,利用高速摄影和马尔文粒度仪分别获得了喷雾撞网动态过程以及撞网后粒径分布,分析了金属网目数对于射流撞网破碎过程的影响规律.试验结果表明:金属网的添加,相比于自由射流,射流形态发生很大的变化,可以有效提高雾化效果;同时随着网目数的减少,撞网后雾化锥角逐渐增加,而平均粒径则逐渐减少.%To enhance the atomization effect of the liquid propellent, the barrier mesh was utilized near the orifice area based on the ammonium dinitramide ( ADN) non-toxic aerospace propellant. The dynamic process of spray impinging on the barrier mesh and the droplet size distribution after passing through the barrier mesh were obtained by high-speed photography and Malvern particle size analyzer respectively. The effect of the metal mesh size on the spray impinging on the barrier mesh was analyzed. The experimental results showed that the shape of the spray changed significantly as compared with the free jet, and the atomization effect could be improved effectively. At the same time, with the decrease of the wire mesh size, the spray cone angle increased, and the average par-ticle size decreased.