This paper presents a novel experimental technique where infrared thermography is employed to directly measure the surface heat transfer of a transpiration-cooled porous material in transient hypersonic flow. Experiments were conducted in the Oxford High Density Tunnel on a flat-faced hemispherical probe at a single Mach 7 freestream condition ( R e u = 3.84 10 6    m 1 ) with nitrogen, air, argon, krypton, and helium injection gases and mass flow rates ranging from 0.01 to 0.235    kg s 1 m 2 . Surface heat transfer measurements were extracted by imaging directly on the porous material using a FLIR A6751 high-speed long-wave infrared camera. Porous alumina was chosen due to its favorable thermal properties for infrared analysis and its very small pore sizes ( 2    μ m ) enabling a uniform outflow. It was found that the surface Stanton number reduction matched to within 10% of both computational fluid dynamics results and correlations.


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    Title :

    Heat Transfer Measurements of a Transpiration-Cooled Stagnation Point in Transient Hypersonic Flow



    Published in:

    Publication date :

    2023-04-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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