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为研究二元收扩喷管排气系统的红外特征及其采取冷却措施后的红外抑制效果,设计了带有冷却结构的喷管实验模型,测量了3组实验状态下的喷管壁面温度和红外辐射强度分布,分析了喷管腔体内各部件的辐射贡献大小。研究结果表明:二元收扩喷管排气系统的积分辐射强度在0°方向上最大,并且随着角度的增大而减小;扩张板的壁面温度下降21.1%,侧壁的壁面温度下降26.6%,可使积分辐射强度降低11.5%~31.9%;在扩张段冷却的基础上,中心锥的壁面温度下降9%,可使积分辐射强度降低21.7%~38.9%。
In order to study the infrared characteristics of the BJP exhaust system and its infrared suppression effect after the cooling measures, a nozzle model with cooling structure was designed and the nozzle wall temperature and Infrared radiation intensity distribution, analysis of the nozzle cavity body radiation contribution size. The results show that the integral radiation intensity of the exhaust pipe of binary nozzle is the largest in the 0 ° direction and decreases with the increase of the angle. The wall temperature of the expansion plate decreases by 21.1% and the wall temperature of the sidewall decreases 26.6%, the integral radiation intensity can be reduced by 11.5% ~ 31.9%. On the basis of the cooling in the expansion section, the central cone’s wall temperature decreases by 9%, which can reduce the integral radiation intensity by 21.7% -38.9%.