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

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

Naved, Imran / Hermann, Tobias / McGilvray, Matthew / Ewenz Rocher, Marc / Hambidge, Chris / Doherty, Luke / Le Page, Laurent / Grossman, Madeleine / Vandeperre, Luc

Abstract

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 ( $R e_{u} = 3.84 \cdot 10^{6} m^{- 1}$ ) with nitrogen, air, argon, krypton, and helium injection gases and mass flow rates ranging from 0.01 to $0.235 kg \cdot s^{- 1} \cdot m^{- 2}$ . 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 ( $\approx 2 μ m$ ) 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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Dokumentinformationen

Titel :

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

Beteiligte:

Naved, Imran (Autor:in) / Hermann, Tobias (Autor:in) / McGilvray, Matthew (Autor:in) / Ewenz Rocher, Marc (Autor:in) / Hambidge, Chris (Autor:in) / Doherty, Luke (Autor:in) / Le Page, Laurent (Autor:in) / Grossman, Madeleine (Autor:in) / Vandeperre, Luc (Autor:in)

Erschienen in:

Journal of Thermophysics and Heat Transfer ; 37 , 2 ; 296-308

Erscheinungsdatum :

2022-09-02

Format / Umfang :

13 pages

ISSN :

1533-6808

DOI :

https://doi.org/10.2514/1.T6610

Medientyp :

Aufsatz (Zeitschrift)