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试验研究了在发动机喷管中加装金属辐射板前后,喷管壁面温度、热喷流温度与喷管红外辐射特征的变化。结果表明,加装金属辐射板后,热喷流与喷管壁面之间的热量传递显著增强,热喷流中心温度降低,壁面温度明显升高,在90°方向上,热喷流3～5μm波段的红外辐射强度降低了38.5%。文中从热喷流、喷管壁面以及金属辐射板等相关部件的温度变化情况对红外辐射强度的变化原因进行了解释。
The changes of the nozzle wall temperature, the thermal jet temperature and the infrared radiation characteristics of the nozzle before and after the installation of the metal radiator plate in the engine nozzle were studied experimentally. The results show that the heat transfer between the thermal jet and the wall of the nozzle increases significantly after the metal radiator is installed. The center temperature of the thermal jet decreases, and the temperature of the wall increases obviously. In the direction of 90 °, Band infrared radiation intensity decreased by 38.5%. In this paper, the causes of the variation of infrared radiation intensity are explained from the temperature changes of the relevant components such as the thermal jet, the nozzle wall and the metal radiator plate.