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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。
Although a great deal of research has been conducted on inter-charged gas-liquid injectors, little is known about the reciprocating gas-air injectors. In order to deeply understand the characteristics of the gas-mixing process of the reciprocating gas-air injector, a flow visualization experiment was carried out by using the particle image velocimetry (PIV) system. The experimental results show that for the OFO reciprocating gas-air injector, the impact angle of air flow and the ratio of oxygen to hydrogen directly influence the impact of air flow and control the mixing process. When the spacing between spray holes is constant, the impact angle The larger the interaction between the airflows, the better the airflow mixing effect. The greater the ratio of oxygen to hydrogen is, the stronger the impingement force is between the airflows and the shorter the mixing distance, the stronger the squeezing action is on the central airflow. The flow field The more obvious the distribution of three-dimensional features is; the better hybrid interceptor gas-air injector can be designed by combining high oxygen pressure drop, low hydrogen pressure drop and large impact angle.