气液同轴式喷嘴缩进比对雾化细度影响的实验

缩进比是液体火箭发动机气液同轴式喷嘴设计中一个重要参数。本文对缩进比对喷嘴雾化特性的影响进行了实验研究。结果表明；在不同工作参数下不同缩进比的喷嘴，其雾化特性有一定的差别。缩进比对雾化细度的影响不如其对雾化的流强和混合比分布及噪声等的影响明显。在气侧压降较小时，缩进比过大过小都不利于雾化；而在气侧压降较大时，缩进比较大或较小都会对雾化有一定的改善。但当缩进比过大时，气液之间的相互作用会使得液体喷注压降明显地波动。

Experimental Investigation of the Influence of Recess Ratio On the Atomization Properties of Coaxial Swirling Injectors

The Recess ratio(RR) is an important design parameter of gas-liquid coaxial swirling injector in liquid rocket engine. In this paper, an experimental investigation of the influence of RR on atomization properties of injectors has been carried out.The results show that there are certain differences between atomization properties of different injectors of different recess ratios under various working conditions. On the whole, the recess ratio does not affect the atomization so obviously as it does on the flux and mixing ratio characteristics. At low gas injecting drop, neither large RR nor small RR is favorable to atomization, on the contrary, both large RR and small RR will meliorate the atomization at high gas injecting drop. However, with too large RR, the liquid injecting drop vibrates owing to the interaction of between and liquid phases.