冷却抑制二元收扩喷管红外特征的模型实验与数值研究

Model Experiment and Numerical Analysis on Infrared Character and Infrared Suppression by Cooling of Two-Dimensional Convergent-Divergent Nozzle

关键词:  二元收扩喷管  红外特征  冷却  红外抑制 

Key words:  Two-dimensional convergent-divergent nozzle  Infrared character  Cooling  Infrared suppression

摘要:

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%。 

Abstract:

To study the infrared character and infrared suppression by cooling of the two-dimensional convergent-divergent nozzle exhaust system, the experimental model of nozzle with cooling structure was designed, the distribution of wall temperature and infrared radiation intensity of three kinds of experimental states were measured,and the infrared radiation of nozzle internal components were analyzed. The results show that, the integral radiation intensity of two- dimensional convergent-divergent nozzle exhaust system decreases with the angle and its maximum value is located at 0°. When the wall temperature of divergent flap is reduced by 21.1% and side wall is reduced by 26.6%, the integral radiation intensity can decrease by 11.5%~31.9%. When the wall temperature of cone is reduced by 9% on the basis of cooling the divergent section, the integral radiation intensity can decrease by 21.7%～38.9%.