多股流S弯喷管红外辐射特性研究  

Investigation on infrared radiation characteristics of multi-stream serpentine nozzle

作　　者：徐建宇 周莉 是介 孟钰博 史经纬[1,2] 王占学 XU Jianyu;ZHOU Li;SHI Jie;MENG Yubo;SHI Jingwei;WANG Zhanxue(School of Power and Energy,Northwestern Polytechnical University,Xi’an 710072,China;Collaborative Innovation Center for Advanced Aero-Engine,Beijing 100191,China)

机构地区：[1]西北工业大学动力与能源学院,西安710072 [2]先进航空发动机协同创新中心,北京100191

出　　处：《航空动力学报》2025年第2期61-71,共11页Journal of Aerospace Power

基　　金：国家自然科学基金(52376032,52076180);陕西省杰出青年科学基金(2021JC-10);国家科技重大专项(J2019-Ⅱ-0015-0036);航空发动机及燃气轮机基础科学中心项目(P2022-B-Ⅰ-002-001,P2022-B-Ⅱ-010-001);中央高校基本科研业务费专项资金(501XTCX2023146001)。

摘　　要：针对自适应发动机用多S弯喷管,通过数值模拟的方法研究了在设计工况及非设计工况下红外辐射强度的空间分布特征,分析了红外辐射特征产生机理及影响因素。结果表明:在设计工况下,由于主流形状弯曲造成内流出口上壁面产生热斑,使得垂直探测面负探测角度壁面红外辐射强度占总辐射最高达54%;在其他探测角度下燃气红外辐射强度为主要辐射来源,喷管内部燃气辐射强度显著高于喷流辐射强度。在非设计工况下,壁面红外辐射强度基本不变;落压比增加导致喷管内部燃气压力与出口波系发生变化,造成喷管内部燃气红外辐射强度增强,喷流红外辐射强度减弱。燃气红外辐射强度受到内部燃气和喷流的共同影响。A numerical simulation was carried out to investigate the spatial distribution characteristics of infrared radiation intensity of a multi-stream serpentine nozzle for an adaptive engine under both design and off-design conditions.The underlying mechanisms and influencing factors of the IR radiation characteristics were comprehensively analyzed.The results revealed that under design conditions,the curvature of the mainstream shape caused a hot spot to form on the upper wall of the nozzle outlet,resulting in the wall infrared radiation intensity accounting for up to 54%of the total radiation at a negative detection angle on the vertical plane.The gas infrared radiation intensity was identified as the main source of radiation at other angles,and the gas radiation intensity within the nozzle was significantly higher than that of the plume radiation intensity.Under off-design conditions,the wall infrared radiation intensity remained relatively constant.An increase in the pressure ratio led to changes in the internal gas pressure and exit shock waves shape of the nozzle,resulting in an enhanced gas infrared radiation intensity within the nozzle,and a weakened plume infrared radiation intensity.The gas infrared radiation intensity was jointly affected by internal gas and plume radiations.

关 键 词：自适应发动机 多股流S弯喷管 离散传递法 红外辐射特征 落压比 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]