化学反应对高空高速空腔流动的影响研究  

Effect of chemical reaction on high altitude and high speedcavity flow

作　　者：张隽研 甘才俊[1] 黄炳修[1] 易欢 王学德[2] ZHANG Junyan;GAN Caijun;HUANG Bingxiu;YI Huan;WANG Xuede(China Academy of Aerospace Aerodynamics,Beijing 100074,China;School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]中国航天空气动力技术研究院,北京100074 [2]南京理工大学能源与动力工程学院,南京210094

出　　处：《兵器装备工程学报》2024年第10期145-151,共7页Journal of Ordnance Equipment Engineering

摘　　要：高空高速飞行器表面的缝隙或缺陷结构(类似于空腔流动)会导致局部气动加热问题,对飞行器局部防热能力提出考验。本文中采用直接模拟蒙特卡洛方法(DSMC),开展了来流高度H=60 km,马赫数Ma=10,不同长深比(L/D)对空腔内部流动结构的影响研究以及化学反应对闭式空腔底部热流的影响研究工作。结果表明:随着长深比(L/D)的增大,空腔底部的压力系数、摩阻系数和表面传热系数都呈增大趋势,当L/D=6时空腔流动结构由开式变为闭式;N、O原子和NO分子集中分布在空腔后方壁面处,引入化学反应使底部热流降低5.5%。The gap or defect structure(similar to cavity flow)on the surface of high-altitude high-speed aircraft can lead to local aerodynamic heating,which puts forward a test on the local thermal protection ability of aircraft.In this paper,the direct simulation Monte Carlo method(DSMC)was used to study the influence of inlet height H=60 km,Ma=10,different length-depth ratio(L/D)on the flow structure in the cavity and the influence of chemical reaction on the heat flux at the bottom of the closed cavity.The results showed that with the increase of length-depth ratio(L/D),the pressure coefficient,friction coefficient and surface heat transfer coefficient at the bottom of the cavity increase,and the flow structure of the cavity changes from open to closed when L/D=6.N,O atoms and NO molecules were concentrated on the rear wall of the cavity,and chemical reactions were introduced to reduce the heat flux at the bottom by 5.5%.

关 键 词：稀薄气体 高超声速 化学反应 空腔流动 DSMC方法 

分 类 号：V19[航空宇航科学与技术—人机与环境工程] V211