6 km/s运动激波波后高温空气辐射特性实验研究  

Experimental study of the radiation characteristics of high-temperature air after a 6 km/s shock wave

作　　者：张森豪 许以欣 张仕忠[1] 张晓源[1] 林鑫[1] 李进平[1] 卢会群 李飞[1] 余西龙[1,2] Zhang Senhao;Xu Yixin;Zhang Shizhong;Zhang Xiaoyuan;Lin Xin;Li Jinping;Lu Huiqun;Li Fei;Yu Xilong(State Key Laboratory of High Temperature Gas Dynamics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;Guangdong Aerospace Research Academy,Guangzhou 511458,China)

机构地区：[1]中国科学院力学研究所高温气体动力学国家重点实验室,北京100190 [2]中国科学院大学工程科学学院,北京100049 [3]广东空天科技研究院,广州511458

出　　处：《空天技术》2023年第3期15-20,39,共7页Aerospace Technology

基　　金：广东省重点领域研发计划资助(2021B0909060004)。

摘　　要：临近空间高超声速飞行器的绕流是经过强激波压缩的高温空气,可以产生强烈的高温辐射,对于飞行器的热防护设计具有重要影响,因此开展波后高温空气辐射特性研究具有重要意义。在中科院力学所的JF-14激波风洞中,开展了6 km/s运动激波波后辐射光谱实验研究。利用超高速相机捕捉了激波的运动和辐射空间分布特征,探索了瞬态和动态结合的辐射光谱测量方法,测量了可见光波段(510~790 nm)的运动激波波后瞬态光谱,并初步获得了N_(2)分子第一正带系光谱、O原子光谱特征谱线,以及Na原子光谱特征谱线的辐射强度时空演化规律。将实验光谱与SPARK 3.0辐射逐线计算程序的理论光谱进行计算拟合,推断了N_(2)分子的转动温度和振动温度。本研究为后续开展激波波后振动弛豫等物理现象的研究工作奠定了基础。The flow around hypersonic vehicles is high temperature air compressed by strong shock waves, which can generate strong radiation. This radiation significantly affects the vehicles' s thermal protection design. Therefore, it is of great significance to research the radiation characteristics of the shock layer. The radiation spectrum after 6 km/s shock wave is studied experimentally. Experiments are performed in the JF-14shock tunnel of the Institute of Mechanics, CAS. The motion of shock wave and the spatial distribution of radiation are captured by a high speed camera. A method of radiation spectroscopic measurements combining transient and dynamics is explored. The transient spectra of visible light band(510~790 nm) are measured.Preliminary spatiotemporal evolution patterns of the emission intensities of the characteristic spectral lines in the first band system of N_(2) molecules, the atomic oxygen(O) spectrum, and the atomic sodium(Na) spectrum have been obtained. The experimental results are compared to theoretical spectra predicted by the line-by-line code SPARK 3.0, and rotational and vibrational temperature of N_(2) are evaluated by spectral matching optimization. This study lays a foundation for further research on post-shock vibration relaxation and other physical phenomena.

关 键 词：发射光谱 辐射特性 地面实验 非接触测量 激波 

分 类 号：V416[航空宇航科学与技术—航空宇航推进理论与工程]