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• W4382517961 endingPage "108488" @default.
• W4382517961 startingPage "108488" @default.
• W4382517961 abstract "When an aircraft flies at hypersonic speeds in the atmosphere, its optical window is subjected to severe aerodynamic heating. To investigate the supersonic film cooling laws of hypersonic optical dome, three supersonic (Mach 2.35) film generation devices with different jet outlet heights (1 mm, 2 mm, 3 mm) were designed. The experiments were conducted in a hypersonic (Mach 7.1) gun wind tunnel. The NPR (nozzle pressure ratio = jet outlet static pressure/nearby mainstream static pressure) ranged from 0 to 2.3. The heat flux on the window surface was measured by the thin film resistance thermometer. Experimental results indicate that, under different jet outlet heights, the film cooling effectiveness increased gradually as the NPR increased, corresponding to an increase in effective cooling length. The existing similarity parameters for film cooling could effectively predict the effective cooling length of supersonic film when NPR = 1. However, the prediction effect deviated significantly when NPR ≠ 1. Moreover, the effective cooling length corresponding to the unit mass flow rate of the coolant first increased and then decreased with the increase of NPR, and there existed an optimal solution. Furthermore, with the same coolant mass flow rate, higher jet Mach number lead to better supersonic film cooling performance." @default.
• W4382517961 created "2023-06-30" @default.
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• W4382517961 date "2023-09-01" @default.
• W4382517961 modified "2023-10-15" @default.
• W4382517961 title "Experimental investigation on supersonic film cooling of hypersonic optical dome under different nozzle pressure ratios" @default.
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• W4382517961 doi "https://doi.org/10.1016/j.ast.2023.108488" @default.
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