Imran Naved, Tobias Hermann, Chris Hambidge, Hassan Saad Ifti, Matthew McGilvray, Iullia S Tirichenko, Luc Vandeperre

DOI Number XXX-YYY-ZZZ

Conference Number HiSST-2022-440

The design of a transpiration cooled system requires detailed local heat transfer information on and in the
vicinity of the porous injector; however, limited spatially resolved experimental studies exist, particularly
in hypersonic flows. In this work experiments were conducted on a flat plate model in the Oxford High
Density Tunnel at Mach 6.1 in both laminar and turbulent regimes. Spatially resolved 2D surface heat
transfer measurements were acquired by imaging directly on and downstream of two micro-porous transpiration cooled injectors (METAPOR CE170 and Zirconia) using high-speed infra-thermography. Whilst
injection in the laminar regime results in a steady, monotonic reduction in heat transfer from the start
of the injector, a flatter profile is present for the turbulent cases where turbulent mixing inhibits surface
heat transfer reduction. It was found that a modification to existing relations from film theory successfully correlates the stream-wise heat transfer distribution on the injector for different blowing rates
of Nitrogen and Helium injection. A key result is that Helium performs much better than reported in
previous experiments for a turbulent boundary layer.

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In Categories: High-Speed Aerodynamics and Aerothermodynamics, HiSST 2022
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