Abstract: Although a lot of research has been done on the impinging injectors with liquid propellants, there was little understanding on impinging gas-gas injector. To get mixing flow characteristics of impinging gas-gas injector, experimental investigation is carried out using Particle Image Velocimetry(PIV) system. The results show that the impinging angle and the momentum ratio of oxygen to hydrogen are the two dominant factors to influence the impinging mixing process. Good mixing is gained at larger impinging angle and high momentum ratio while the three dimension effects aggravate at one time.

Key words: Triple impinging gas-gas injector; Particle image velocity; Mixing flowfield;Impinging angle

摘要： 虽然针对互击式气-液喷注器开展了大量研究,但对互击式气-气喷注器的了解甚少。为了深入理解互击式气-气喷注器气气混合过程的特点,利用粒子图像测速(PIV)系统对其开展了流动显示实验研究。实验结果表明:对于O-F-O互击式气-气喷注器,气流撞击角度和氧/氢动量比直接影响着气流撞击作用的大小,控制着气流混合过程；对于喷孔间距保持一定时,撞击角越大,气流间的相互作用越强,气流混和效果越好；氧/氢动量比越大,气流间撞击力越强,混合距离越短,对中心气流的挤压作用越厉害,其流场分布三维特征越明显；可以通过组合高的氧压降、低的氢压降和大撞击角来设计混合效果较好的互击式气-气喷注器。

关键词: 互击式气-气喷注器;粒子图像测速;混合场;撞击角