The thermochemical non-equilibrium scale effects of the high enthalpy nozzle  

作　　者：Junmou Shen Hongbo Lu Ruiqu Li Xing Chen Handong Ma 

机构地区：[1]China Academy of Aerospace and Aerodynamics,Beijing 100074,China

出　　处：《Advances in Aerodynamics》2020年第1期412-431,共20页空气动力学进展（英文）

基　　金：the National Key Research and Development Plan of China through the project No.2019YFA0405200 and 2019YFA0405300;National Natural Science Foundation of China No.11672283;China Scholarship Council No.201704980060.

摘　　要：The high enthalpy nozzle converts the high enthalpy stagnation gas into the hypervelocity free flow.The flow region of the high enthalpy nozzle consists of three parts:an equilibrium region upstream of the throat,a non-equilibrium region near the throat,and a frozen region downstream of the throat.Here we propose to consider the thermochemical non-equilibrium scale effects in the high enthalpy nozzle.By numerically solving axisymmetric compressible Navier-Stokes equations coupling with Park’s two-temperature model,the fully non-equilibrium solution is employed throughout the entire nozzle.Calculations are performed at different stagnation conditions with the different absolute scales and expansion ratio.The results of this study are twofold.Firstly,as the absolute scale and expansion ratio increase,the freezing position is delayed,and the flow approaches equilibrium.Secondly,the vibrational temperature and Mach number decrease with the increase in the nozzle scale and expansion ratio,while the speed of sound,static pressure,and translational temperature increase as the nozzle scale and expansion ratio increase.

关 键 词：High enthalpy nozzle Hypervelocity free flow Thermochemical nonequilibrium flow Scale effects 

分 类 号：O35[理学—流体力学]