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刘常春,吉洪湖.S弯二元喷管红外辐射特性实验[J].航空动力学报,2019,34(7):1493~1500
S弯二元喷管红外辐射特性实验
Experiment on infrared radiation characteristics of S shaped 2D nozzle
投稿时间:2019-01-01  
DOI:10.13224/j.cnki.jasp.2019.07.010
中文关键词:  排气系统  S弯  二元喷管  红外辐射  实验特征
英文关键词:exhaust system  S shaped  two-dimensional nozzle  infrared radiation  experimental characteristics
基金项目:
作者单位
刘常春 中国航空发动机集团有限公司 商用航空发动机有限责任公司,上海 200241
南京航空航天大学 能源与动力学院,南京 210016 
吉洪湖 南京航空航天大学 能源与动力学院,南京 210016 
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中文摘要:
      基于轴对称排气系统设计了一套S弯二元喷管的实验模型,在实验工况下测量了喷管实验件的部分流场参数和远场红外辐射特性,对S弯二元喷管的红外辐射特性进行了分析和研究,并与基准轴对称喷管的红外辐射实验结果进行了对比。结果表明:上方探测平面是S弯二元喷管的主要辐射方向,其最大辐射角度为15°,在该方向角上固体壁面辐射的贡献最大。下方和侧向探测平面各方向角的红外辐射强度明显小于上方探测平面,主要是由于S弯二元喷管遮挡了大部分的内部高温壁面。与基准轴对称喷管对比,S弯二元喷管有着明显的红外抑制作用,在尾部方向S弯二元喷管的积分辐射强度相比轴对称喷管降低了81%,最大辐射强度相比轴对称喷管降低了47%,燃气辐射降低50%。
英文摘要:
      A experiment model of S shaped 2D nozzle was designed based on axisymmetric exhaust system and studied on the infrared characteristic experiment rig. Flow parameters and the far field infrared radiation characteristics of the experiment model were measured under experimental conditions, and compared with the baseline axisymmetric nozzle experiment data. Results showed that, infrared radiation power of S shaped 2D nozzle was mainly in the upper detection plane, and the maximum radiation was in 15 degrees, due to the largest radiation contribution of solid walls in this direction angle. Infrared radiation power in lower and side detection plane was much less than that in upper detection plane because of the shielding effect of S shaped 2D nozzle. Compared with the axisymmetric nozzle, S shaped 2D nozzle had significant effect of infrared suppression, the infrared signature of the S shaped 2D nozzle reduced by 81% in the rear direction, and the maximum radiation intensity reduced by 47%, while the gas radiation reduced by 50%.
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