几何参数对S弯喷管红外辐射特性的影响  

Effects of Geometric Parameters on Infrared Signature of Serpentine Nozzle

作　　者：程稳 周莉 王占学[1] 孙啸林[1] 史经纬[1] CHENG Wen;ZHOU Li;WANG Zhan-xue;SUN Xiao-lin;SHI Jing-wei(School of Power and Energy,Northwestern Polytechnical University,Xi＇an 710129,China)

机构地区：[1]西北工业大学动力与能源学院,陕西西安710129

出　　处：《推进技术》2018年第9期1974-1985,共12页Journal of Propulsion Technology

基　　金：国家自然科学基金(51576163)

摘　　要：为了深入理解和掌握S弯喷管的红外辐射特性,采用数值模拟的方法着重研究了轴向长度比和中心线变化规律这两个几何参数对S弯喷管红外辐射特性的影响。结果表明,S弯喷管在水平探测面上的燃气红外辐射强度比垂直探测面上的低61.1%。同时,在垂直探测面上,下方的壁面红外辐射强度高于上方的。轴向长度比和中心线不同的S弯喷管,总红外辐射强度的变化在2.2%~6.3%。虽然S弯喷管轴向长度比和中心线变化规律对喷管性能有显著的影响,但其对红外辐射特性的影响较小。因此,仅从红外辐射的角度,在S弯喷管的设计过程中轴向长度比和中心线变化规律可不作为主要考虑因素。In order to acquire the infrared signature of serpentine nozzle,the study on the effects of the length ratio and the centerline on the infrared signature of serpentine nozzle had been performed.The results show that the gas infrared signature in the horizontal plane reduces by 61.1% on average when compared with that in the vertical plane.Otherwise,in the vertical plane,the wall infrared signature at negative azimuth angle is greater than that at positive azimuth angle.The relative differences of total infrared radiation intensity between the serpentine nozzles with different length ratio and centerline are between 2.2% and 6.3%.The length ratio and the centerline have significant influences on the flow performance,but their effect on the infrared signature is limited.And these two design parameters can be ignored in the design process of serpentine nozzle on the view of infrared suppression.

关 键 词：S弯喷管 红外抑制 红外辐射特性 排气系统 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]