Laminar transpiration cooling experiments in hypersonic flow
نویسندگان
چکیده
Abstract The mixing between the coolant and boundary-layer gas downstream of an injector—for transpiration/film cooling—has been extensively studied for turbulent flows; however, only a handful studies concerning laminar exist, particularly in hypersonic flows. In this paper, concentration at wall heat flux reduction transpiring injector flow are experimentally measured examined. Experiments performed Oxford High Density Tunnel Mach 7. A flat-plate model is coated with pressure-sensitive paint (PSP) to spatially resolve film obtain effectiveness based on concentration. Thin-film arrays installed measure reduction. Six different cases featuring nitrogen helium as gas, where blowing ratio varied from 0.0406% $$0.295\%$$ 0.295 % . unit Reynolds number $$12.9\times 10^6\;\mathrm {m^{-1}}$$ 12.9 × 10 6 m - 1 up $$95\%$$ 95 achieved immediately (2 mm) injector. drops monotonic fashion farther downstream; constant coverage 5–20 mm observed higher ratio. above 15% over three lengths present even lowest Heat all cases. obtained PSP compared thermal calculated latter found be than former data points. Finally, collapse modified analytical correlation proposed. Graphical abstract
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ژورنال
عنوان ژورنال: Experiments in Fluids
سال: 2022
ISSN: ['0723-4864', '1432-1114']
DOI: https://doi.org/10.1007/s00348-022-03446-1