Measurements of non-equilibrium and equilibrium temperature behind a strong shock wave in simulated martian atmosphere

作     者：Xin Lin Xi-Long Yu Fei Li Shao-Hua Zhang Jian-Guo Xin Xin-Yu Zhang 

作者机构：School of OptoelectronicsBeijing Institute of Technology State Key Laboratory of High Temperature Gas DynamicsInstitute of MechanicsChinese Academy of Sciences 

出 版 物：《Acta Mechanica Sinica》 (力学学报（英文版）)

年 卷 期：2012年第28卷第5期

页      面：1296-1302页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

主　　题：Radiation measurements - Shock wave Marsre-entry Rotational temperature Vibrational temperature 

摘      要：Non-equilibrium radiation measurements behind strong shock wave for simulated Martian atmosphere are presented in this paper. The shock wave is established in a hydrogen oxygen combustion driven shock tube. Time- resolved spectra of the Av = 0 sequence of the B^2∑^＋ → X^2∑^＋ electronic transition of CN have been observed through optical emission spectroscopy （OES）. A new method, which is based on fitting high resolution spectrum for rotational and vibrational temperatures measurement, is proposed to diag- nose temperature distribution behind the shock wave. It is estimated that the current scheme has the maximum deviation less than 8% （lσ） for vibrational temperature measurement through detailed analysis of the influence of the uncertainties of spectroscopic constants and spectral resolution. Radiation structure of the shock layer, including induction, relaxation and equilibrium process, and corresponding rotational and vibrational temperatures are obtained through time gating OES diagnostics with sub-microsecond temporal resolution. The present extensive results will strongly benefit the reaction rate estimation and computational fluid dynamics （CFD） code validation in high enthalpy Mars reentry chemistry.