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本文分析了高空大面积比喷管在地面试验时喷管内出现火焰偏摆的原因,叙述了喷管内气流不对称分离的机理。通过分析得出,由此产生的火焰偏摆在高空模拟试验或用截短喷管的地面试验中会自然消失。本文通过喷管流场计算,附面层分离计算和传热计算说明试车中出现的现象。
This paper analyzes the causes of the flame deflection in the nozzle when the high-altitude large-area ratio nozzle is tested on the ground and describes the mechanism of the asymmetric separation of the airflow in the nozzle. The analysis shows that the resulting flame deflection naturally disappears in high-altitude simulation tests or in ground tests with truncated nozzles. In this paper, nozzle flow field calculation, surface separation calculation and heat transfer calculation shows that the phenomenon occurred during the test.