半球形整流罩厚度对气动热辐射的影响  

Influence of thickness of hemispherical dome on aerodynamic thermal radiation

作　　者：王惠 党凡阳 张荣达 明月 范志刚[1] Wang Hui;Dang Fanyang;Zhang Rongda;Ming Yue;Fan Zhigang(Research Centre for Space Optical Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学空间光学工程研究中心,黑龙江哈尔滨150001

出　　处：《红外与激光工程》2018年第12期145-150,共6页Infrared and Laser Engineering

基　　金：国家安全重大基础研究项目(6132760102-03);航天科技创新基金(JTBL11610)

摘　　要：气动加热的高温整流罩会产生强烈的红外辐射,影响导引头对目标的探测精度。为了寻求减弱整流罩气动热辐射的方法,建立了气动热辐射数学模型。利用有限元软件以及建立的气动热辐射数学模型对不同厚度的半球形整流罩气动热和气动热辐射进行了数值仿真,得到了半球形整流罩厚度对气动热和气动热辐射的影响规律。研究结果表明,在相同飞行工况下,工作10 s时,当半球形整流罩厚度由3 mm增厚到8 mm,整流罩驻点温度降低了16.23%;形变量减少了54.2%;探测器接收面上的最大辐照度减少了84.43%。因此增加整流罩的厚度可以降低整流罩的温度,有效减小整流罩的热形变和探测器上接收到的干扰辐射照度。Aerodynamically heated high temperature dome will produce strong infrared radiation.In some serious cases when the probe reaches saturation,the detecting precision of the seeker for target can be severely affected.In order to reduce the aerodynamic thermal radiation of the dome,a mathematical model of aerodynamic thermal radiation was developed.The aerodynamic heat and the aerodynamic thermal radiation of the hemispherical dome with different thickness were simulated numerically by software of finite element analysis and the mathematical model of aerodynamic thermal radiation.The influence of the thickness of hemispherical dome on the aerodynamic thermal response and aerodynamic heat radiation was analyzed and obtained.Research indicates that in the same flight conditions and in10s,when the thickness of hemispherical dome increases from3mm to8mm,the stagnation point temperature of the dome reduces by16.41%;the thermal deformation of the dome reduces by54.2%;the maximum irradiance of receiving surface of the detector decreases by84.43%.Therefore increasing the thickness of the dome can not only reduce the temperature of the dome,but also effectively reduce the thermal deformation of the dome and the interference radiation illumination received on the detector.

关 键 词：气动热辐射 半球形整流罩 厚度 

分 类 号：TN206[电子电信—物理电子学] O435.1[机械工程—光学工程]