变轨发动机组辐射传热地面模拟试验

采用电加热器和水冷真空舱近似模拟发动机内外的高温燃气和低温真空环境，以敷辐射涂层的不锈钢代替铌合金，在地面进行了飞船变轨发动机组缩比试验件的高温辐射模拟试验。结果表明：中部温度为900℃，喷口温度为250℃的试验工况下，四机并联工作引起的最大周向温差在中亿部和喷口分别约为21℃和150℃，两机工况时周向温度不均匀性不及四机严重，喉部温差基本可忽略。

Ground simulation test on radiation heat transfer of orbit maneuvering engine group

Electric heaters and vacuum cabin were used to simulate the hot combustion gas and the cryogenic vacuum environment. Stainless steel coated with radiation coat replaces niobium alloy. The simulation test of high temperature radiation of the orbit maneuvering engine group was performed on the ground.The result proved that on the condition of throat temperature being 900 ℃ and exit temperature being 250 ℃, the circular temperature change caused by parallel connection arrangement of the four engines is about 21 ℃ at throat and 150 ℃ at the exit of the nozzle. The circular temperature nonuniformity of two working engines is less than that of four working engines, so the temperature change at throat can be omitted.