摘要
本文采用数值计算的方法研究涡扇发动机轴对称分开排气系统红外辐射特征,分析了轴对称分开排气系统在3~5?m波段积分辐射强度的空间分布以及各个固体部件红外辐射的贡献,并讨论了高温部件冷却对排气系统红外辐射特征的影响规律。结果表明:在0°方向上,尾锥的积分辐射强度为总积分辐射强度的65%;采用冷却空气对尾锥进行冷却,冷却空气量在0.02 kg/s^0.06kg/s范围内,尾锥平均温度降低12%~22%,可以降低排气系统红外辐射强度28.4%~41.8%。
The Infrared Radiation（IR） characteristic of the axisymmetrical individual exhaust system of turbofan engine has been investigated with numerical simulation method. The IR characteristics in the wa- veband of 3-5 μm of the individual exhaust systems and the IR contributions of different solid parts were calculated and analyzed. The effect of cooling the hot-parts on IR characteristic of exhaust system is dis- cussed. The results show that integral radiation intensity of plug accounts for 65% of the total integral radi- ation intensity at 0° Cooling air is adopted to reduce wall temperature of the plug, of which flow rate va- ries from 0.02kg/s to 0.06kg/s. The average temperature of center body was depressed by 12%-22%, and the IR intensity of exhaust system can be reduced by 28.4%-41.8%.
出处
《红外技术》
CSCD
北大核心
2016年第5期422-428,共7页
Infrared Technology
关键词
涡扇发动机
分开排气系统
红外辐射特征
尾锥冷却
turbofan engine, individual exhaust system, infrared radiation characteristic, plug cooling
