针栓式推力室冷却特性试验研究

针栓式发动机具有推力调节简单、声学燃烧稳定性好和成本低廉等一系列优点,但目前对针栓式推力室的冷却特性掌握还不够深入,研制过程中曾多次出现因推力室冷却组织不好而烧蚀的问题。采用针栓式推力室试验件,对身部的冷却特性进行了深入研究,结果表明:推力室圆柱段前端的温度较低,无需采用专门的冷却措施;末端内侧气壁温度会达到约1650℃,局部存在明显的烧蚀现象,必须采取有效的热防护措施;下游冷却液膜量的变化对圆柱段的冷却特性影响较小。

Experimental study on cooling characteristics of pintle thruster

Pintle engine has a series of advantages,such as simply thrust adjustment,good acoustic combustion stability,low cost,etc.However,the cooling characteristics are still unclear at present,and the ablating problem due to poor cooling structure of the thruster has occurred many times in the pintle engine development process.In this paper,a pintle thruster article was used to study the cooling characteristics of its body.The results show that,a)the temperature of the thruster pre-cylinder is lower and the usual steel can endure;b)the maximum inner wall temperature of the aft cylinder will reach about 1650℃,and effective thermal protection measures must be taken since there are obvious ablation phenomena locally;c)the cooling characteristics are little affected by the downstream film flow rate.The research results of this paper are useful to optimize the thermal protection of the pintle thruster.