Transpiration-Cooling Heat Transfer Experiments in Laminar and Turbulent Hypersonic Flows
نویسندگان
چکیده
The design of a transpiration-cooled system requires detailed local heat transfer information on and in the vicinity porous injector; however, limited spatially resolved experimental studies exist, particularly hypersonic flows. In this work, experiments were conducted University Oxford’s high-density tunnel at Mach 6.1 both laminar turbulent regimes. Spatially two-dimensional surface measurements acquired by imaging directly downstream two microporous injectors (METAPOR® CE170 zirconia) using high-speed infrared thermography. Whereas injection regime results steady, monotonic reduction from start injector, flatter profile is present for cases where mixing inhibits reduction. It was found that modification to existing relations film theory successfully correlates streamwise distribution injector different blowing rates nitrogen helium. A key result helium performs much better than reported previous experiments. Finally, thermal effectiveness characterized collapse achieved modified analytical correlation proposed.
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ژورنال
عنوان ژورنال: Journal of Thermophysics and Heat Transfer
سال: 2023
ISSN: ['1533-6808', '0887-8722']
DOI: https://doi.org/10.2514/1.t6626