红外热图在高超声速低密度风洞测热试验中的应用概述

The summarization of infrared thermography on aerodynamic heating measurement in hypersonic low density wind tunnel

围绕大极角情况下模型表面温度的测量、红外热图测热精度的提高、模型物面坐标与红外热图像素位置对应关系等问题,对近年来在高超声速偌氏密度风洞开展的红外热图测热工作进行了总结,给出了一些实用、简单、经济的方法。为验证上述技术,在高超声速低密度风洞开展了用红外热图技术与热电偶同时测量一平板带劈薄壁模型表面的气动加热率分布以及半球圆柱模型红外测热数据与DMSC计算结果的比较。不同手段获得的数据与红外测热数据相互验证的结果表明:这些技术的解决,有利于红外热图技术向工程化实用化迈进。

Such problems as surface temperature measurement under great measurement angle, the measurement accuracy, and the corresponding relation between model spatial coordinates and the pixels in infrared thermography etc. , are studied in heating rate measurement by infrared thermography in hypersonic low-density wind tunnel. The studies in the recent years have been summarized and some practical and simple methods are given. To validate these above-mentioned techniques, aerodynamic heating rates on a thin skin flat plate with a wedge were measured by means of both infrared thermography and thermocouple, the ones on a sphere-cylinder model were measured using infrared thermograpy and compared with DMSC theoretical method in hy personic low density model wind tunnel, and the results agreed well with each other. As a result, the solutions to the problems will push forward infrared thermography to the engineering and practical application.