高温气体辐射发光下温敏涂层热流密度辨识方法  

Method for Identifying Heat Flux of Temperature-Sensitive Paint under High-Temperature Gas Radiation

作　　者：贾广森 金鑫[1] 姚大鹏[1] 陈农[1] JIA Guangsen;JIN Xin;YAO Dapeng;CHEN Nong(China Academy of Aerospace Aerodynamic,Beijing 100074,China)

机构地区：[1]中国航天空气动力技术研究院,北京100074

出　　处：《气体物理》2025年第1期68-78,共11页Physics of Gases

基　　金：国家自然科学基金(11972332)。

摘　　要：为解决温敏涂层技术在高温气体辐射发光等强干扰条件下的热流密度辨识难题,基于涂层表面辐射光强的梯度变化,采用Levenberg-Marquardt优化算法,建立了气体辐射发光条件下全局最优化热流密度辨识方法。并采用平板-楔模型在高焓激波风洞中开展了实验研究,实验来流总温分别为2816 K与4620 K。结果表明,高温气体辐射对光学测量方法有重要影响,随着来流总温的增加,气体辐射发光进一步增强。涂层表面光强梯度幅值随时间逐渐降低,并趋于稳定值;在不同总温条件下,温升较小的平板区域,气体辐射光强梯度幅值在总梯度幅值中的最大占比为16.9%,在温升较大的区域占比在4.8%以下。基于梯度变化的全局最优化热流密度辨识方法在气体辐射光强梯度占比较小的条件下可有效消除高温气体辐射发光的影响,获得较为可靠的热流密度数据,在平板无干扰区及楔面热流密度峰值区域与热电偶测量结果相差在20%以内。In order to solve the problem of heat flux identification of temperature-sensitive paints under the interference condition of high-temperature gas radiation luminescence,based on the gradient change of radiation light intensity of the coating,a heat flux identification method using the Levenberg-Marquardt optimization algorithm had been established,and experiments were carried out using the flat plate-wedge model in the high-enthalpy shock tunnel,with the total temperature of 2816 K and 4620 K,respectively.The results show that the high-temperature gas radiation has an important influence on the optical measurement method,and the gas radiation luminescence is further enhanced with the increase of the total temperature of the incoming flows.The amplitude of the light intensity gradient on the coating surface gradually decreases with time and tends to be stable.Under different total temperature conditions,in the flat area with a small temperature rise,the maximum value of the gas radiation light intensity gradient amplitude in the total gradient amplitude is 16.9%,accounting for less than 4.8%in areas with large temperature rise.The global optimal heat flux identification method based on gradient change can effectively eliminate the influence of high-temperature gas radiation,and the difference between the measurement results of temperature-sensitive paint and the thermocouple measurement results is less than 20%in the non-disturbing area of the plate and the peak heat flux area of the wedge.

关 键 词：高温气体辐射发光 温敏涂层技术 光强梯度 热流密度辨识 热电偶 

分 类 号：V211.7[航空宇航科学与技术—航空宇航推进理论与工程]