喷嘴形式对幂律型非牛顿推进剂雾化特性的影响

为寻求幂律型非牛顿推进剂有效的雾化喷嘴形式,采用与该推进剂流变特性基本一致的水基模拟液对直流式喷嘴、撞击式喷嘴、剪切撞击式气动雾化喷嘴、气泡雾化喷嘴和离心式喷嘴进行了雾化特性实验,比较了喷嘴形式及其结构参数对雾化特性的影响.结果表明:撞击式喷嘴是一种有效的雾化形式,撞击角度和射流速度是主要影响参数;气泡雾化喷嘴是一种高效的雾化方法,在约为4%的气液比下使水基模拟液破碎并产生液滴. 

Effects of different injectors on spray characteristics of power-law non-Newtonian propellant

In order to seek the effective injector type of the power-law non-Newtonian propellant,a water-based simulants whose rheological behavior was in accord with actual propellant was used. The injectors, including plain orifice, impinging injector, shearing impinging pneumatic atomizer, effervescent atomizer and swirling injector were investigated by experiments, and the effects of different injectors and their structural parameters on the spray characteristics were compared. The results indicate that the impinging injector is effective and its impinging angle and injection velocity are the main influencing parameters to spray property. The effervescent atomizer is an effective injector type. Water-based simulants break up and produce drops when ratio of air/liquid mass flow rate is about 4%.