针栓式喷注器锥形液膜破碎特性试验

采用高速摄影获得了针栓式喷注器在不同喷注压降和结构参数下的表面波破碎图像，测量了锥形液膜的破碎长度和破碎时间，研究了变工况时液膜破碎长度和破碎时间的变化规律.试验结果表明:在喷注压降不变的条件下，针栓式喷注器能够实现流量的线性调节.针栓式喷注器设计时，在合理的推进剂动量比范围内，狭缝宽度应尽量取小.液膜在低工况时破碎得更快.液膜破碎长度和破碎时间均随喷注压降的增加而减小. 

Experiment of breakup characteristics on conical sheets of pintle injectors

The fragmenting images of surface wave of a pintle injector in different injection pressure drops and structural parameters were obtained using high-speed photography, and the breakup length and breakup time of the conical sheets were measured. Moreover, the variations of the breakup length and breakup time in different operating conditions of the pintle injector were analyzed. According to the experimental results, the mass flow rate of the pintle injector can achieve linear variation in the condition of constant injection pressure drop. When designing a pintle injector, the slit width should be chosen as small as possible within the reasonable range of momentum ratio of propellants. The conical sheets breakup more quickly in the low working condition. In addition, both of the breakup length and breakup time of the conical sheets reduce along with increase of injection pressure drop.