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首页> 美国政府科技报告 >FULL-COVERAGE FILM COOLING HEAT TRANSFER STUDY - SUMMARY OF DATA FOR NORMAL-HOLE INJECTION AND 30° SLANT-HOLE INJECTION
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FULL-COVERAGE FILM COOLING HEAT TRANSFER STUDY - SUMMARY OF DATA FOR NORMAL-HOLE INJECTION AND 30° SLANT-HOLE INJECTION

机译：全覆盖薄膜冷却换热研究 - 正常注射和30°注入孔注射数据汇总

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Heat transfer to a full-coverage film-cooled turbulent boundary layer over a flat surface was studied. The surface consisted of a discrete hole test section containing 11 rows of holes spaced 5 diameters apart in a staggered array and an instrumented recovery region. Ten diameter spacing was also studied by plugging appropriate holes. Two test sections were used, one having holes normal to the surface and the other having holes angled 30° to the surface in the downstream direction. Stanton number data were obtained both in the full-coverage region and in the down-stream recovery region for a range of blowing ratios, or mass flux ratios, from 0 to 1.3. Initial conditions at the upstream edge of the blowing region were varied from 500 to 5000 for momentum thickness Reynolds number and from 100 to 1800 for enthalpy thickness Reynolds number. The range of Reynolds numbers based on hole diameter and mainstream velocity was 6000 to 22 000. Initial boundary layer thicknesses ranged from 0.5 to 2.0 hole diameters. Air was used as the working fluid. The data were taken for the secondary injection temperature equal to the wall temperature and also equal to the mainstream temperature. Superposition was then used to obtain Stanton number as a continuous function of the injectant temperature. The heat transfer coeffi¬cient was defined on the basis of a mainstream-to-wall temperature difference. This definition permits direct comparison of performance between film cooling and transpiration cooling.

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