一种气氧/气甲烷火炬式电点火器方案研究

Research on a GOX/GCH4 spark torch igniter

针对液氧/甲烷发动机多次启动时推力室点火,对一种气氧/气甲烷火炬式电点火器开展了研究,进行了方案设计,确定了点火室压力、点火器混合比以及冷却方式,开展了多次点火试验,验证了气氧/气甲烷的点火混合比范围,获得了点火特性,并同时验证了多次点火能力及点火重复性,证明方案基本可行。在试验件分解后发现火花塞端面和引火管存在局部高温过热区域,对点火器点火过程以及燃烧传热过程开展仿真,确定了高温烧蚀出现的机理,并明确了结构改进优化的方向。

For the combustion chamber ignition in multi-startup of LOX / methane rocket engine,the development of a GOX / GCH4 spark torch igniter is required. The conceptual design was conducted and the igniter chamber pressure,igniter mixture ratio,and cooling type were determined. Ignition tests were carried out to check the ignition boundary,to obtain the performance,and to verify the continuous ignition capacity and consistency. The results showed that the design was feasible. However it was found that over-heats spot existed in the spark plug surface and the flame tube after the analysis of the test parts. So simulations on the ignition and combustion process were conducted and the mechanisms of the over-heat zone were determined. The directions of improvement and optimization were thus proposed.