氢燃料双模态冲压模型发动机M6的试验研究

A hydrogen fueled dual-mode scramjet model experiment investigation at M6

笔者研究了一个有突扩台阶的氢燃料高超声速冲压发动机模型的气体动力学特性和推力特性。氢气从位于燃烧室突扩台阶后的支板逆来流喷注,测量了氢气燃烧状态下模型发动机壁面的压力分布和推力收益数据。实验结果表明,在氢气的当量油气比为0.35～0.8的范围,在本模型流道构型条件下,氢气自燃,并随当量油气比的增加,燃烧室内压力增加,获得的推力收益增大,最大推力收益达到500N。实验在CARDC的脉冲燃烧风洞中进行,实验马赫数为6,总温1850K,总压5.5MPa。

In this paper a dual-mode Scramjet model engine was experimentally investigated with hydrogen fuel burning. The fuel was injected into the combustor against the airflow from the holes in pylons, which was settled downstream the rear-face step. The wall pressure and the drag-thrust were measured with and without combustion. The measured data indicated that hydrogen fuel could be self-ignited when the equivalent fuel-air ratio varied from 0.35 to 0.8. As equivalent fuel-air ratio ( cp ) increased, static pressure in the combustor and thrust increased. The maximum thrust increase was more than 500N. The experiment was conducted in the Pulse-type Combustion Heated Wind Tunnel in CARDC. The free flow parameters were: M number 6, total temperature 1850K,and the total pressure 5.5MPa.