超高速风洞温敏漆膜基结构传热特性分析

Analysis on Heat Transfer Characteristics of Film-based Structures with Temperature Sensitive Paint in Hypersonic Wind Tunnels

磷光热图技术是实现超高速风洞流场下飞行器模型表面热环境测量的关键技术之一,但目前仍缺乏温敏漆(TSP)膜基结构传热特性及膜基材料适用性的系统研究。本文开展了不同材料厚度的TSP膜基结构在不同流场工况下内部传热特性的数值仿真分析。针对超高速脉冲式和暂冲式风洞,分别研究了流场作用时间、表面热流密度和TSP层厚变化对不同材料体系膜基结构内部热扩散深度及表面温升的影响规律。结果表明:TSP膜基结构内部热扩散深度主要与模型材料热扩散率和流场作用时间有关,受热流密度和TSP层厚的影响较小;表面温升主要随热流密度和TSP层厚变化,且均呈正相关趋势。研究成果可为磷光热图在风洞试验应用中定制化设计膜基结构材料和厚度提供理论支撑。

The phosphor thermography technology is one of the key technologies to measure the thermal environment of aircraft model surface in the flow fields of hypersonic wind tunnels.However,there is still a lack of systematic research on the heat transfer characteristics of film-based structures with temperature sensitive paint(TSP)and the applicability of film-based materials.Therefore,a numerical simulation analysis on the internal heat transfer characteristics of TSP film-based structures with different material thicknesses under different flow field conditions is carried out.The effects of therunning time,surface heatflux,and TSP layer thickness on the internal thermal diffusion depth and surface temperature rise of the film-based structures with different material systems are studied for hypersonicshock and blow-down wind tunnels.The results show that the internal thermal diffusion depth of the TSP film-based structure is mainly related to the thermal diffusion coefficient of the model material and the running time,and is less affected by the heatflux and the TSP layer thickness.The surface temperature rise mainly varies with the heatfluxand TSP layer thickness,and the changes both are positively correlated.The research results could provide theoretical support for the customized design of the material and thickness of film-based structures in the applications of phosphor thermography in wind tunnel tests.