离散颗粒抑制热喷流红外辐射的大涡模拟  

Large eddy simulation of discrete particles suppressing infrared radiation from thermal jets

作　　者：胡峰 孙文静 张靖周[1] 单勇[1] HU Feng;SUN Wenjing;ZHANG Jingzhou;SHAN Yong(College of Energy and Power,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Beijing Power Machinery Institute,China Aerospace Institute of Science and Technology,Beijing 100074,China)

机构地区：[1]南京航空航天大学能源与动力学院,江苏南京210016 [2]中国航天科工飞航技术研究院北京动力机械研究所,北京100074

出　　处：《中南大学学报（自然科学版）》2023年第4期1576-1591,共16页Journal of Central South University:Science and Technology

基　　金：中国博士后科学基金特别资助(站前)项目(2020TQ0143);江苏省自然科学基金青年基金资助项目(BK20200448)。

摘　　要：为了探究气溶胶离散颗粒对飞行器排气喷管热喷流3~5μm波段的红外辐射的抑制效果,设计地面状态下气溶胶颗粒投射的仿真环境,采用大涡模拟和颗粒离散相模型对含气溶胶颗粒的飞行器排气喷管尾部气固两相剪切流进行数值模拟研究,系统地分析颗粒的质量流量、粒径和喷射速度对离散颗粒空间分布形态以及热喷流红外辐射抑制的影响规律。研究结果表明:颗粒的质量流量和粒径对于红外抑制效率的影响较为明显,增加颗粒质量流量对颗粒的空间分布形态影响较小,但能够显著提升红外抑制效率;当颗粒粒径大于1.0μm时,颗粒空间分布均匀,红外抑制效率最高;颗粒的喷射速度对于颗粒的空间分布以及红外抑制效率的影响较小。To investigate the effect of aerosol discrete particles on the infrared radiation suppression in the 3~5μm band of thermal jets of aircraft exhaust nozzles,the simulation environment of aerosol particle projection under ground conditions was designed.The large eddy simulation(LES)and particle discrete phase model(DPM)were used to numerically simulate the gas-solid two-phase shear flow at the tail of the aircraft exhaust nozzle containing aerosol particles,and the effect law of particle mass flow,size and jet speed on the spatial distribution of discrete particles and the suppression of infrared radiation of thermal jets was systematically analyzed.The results show that the effect of particle mass flow and size on infrared radiation suppression rate is obvious.With the increase of particle mass flow,its effect on the spatial distribution of particles is small,but the infrared suppression efficiency is significantly improved.When the particle diameter is 1.0μm,the particle space distribution is uniform and the highest infrared suppression rate is achieved.However,the particle injection speed has less effect on the spatial distribution of particles and infrared radiation suppression efficiency.

关 键 词：红外抑制 高速剪切流 大涡模拟 气溶胶颗粒分布 气固相互作用 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]