Full-Coverage Film Cooling—Part I: Comparison of Heat Transfer Data for Three Injection Angles
Full-Coverage Film Cooling—Part I: Comparison of Heat Transfer Data for Three Injection Angles
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全覆盖气膜冷却—第一部分：三种喷射角度的传热数据比较
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
R. Moffat
中科院分区：
文献类型：
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作者：
M. Crawford;W. Kays;R. Moffat
1971 年至 1977 年间，斯坦福大学进行了风洞实验，研究三种几何形状的全覆盖薄膜冷却表面的传热特性：正常喷射、30 度倾斜喷射和 30 度×45 度复合角度喷射。传热系统由平坦的全覆盖部分和下游回收部分组成。实验目标是确定每种几何结构的喷吹比 (M)、喷吹温度比 (θ) 和上游初始条件对表面热通量的影响。展向平均斯坦顿数是针对从 0 到 1.3 的吹塑比以及每个吹塑比下的两个注射温度值进行测量的。传热系数是根据主流壁温差定义的。初始动量和焓厚度雷诺数从 500 变化到约 3000。本文比较了三种喷射几何形状的实验结果。此外，还检查了孔间距和孔排数的影响。
Wind tunnel experiments were carried out at Stanford between 1971 and 1977 to study the heat transfer characteristics of full-coverage film cooled surfaces with three geometries: normal-, 30 deg slant-, and 30 deg × 45 deg compound-angled injection. A flat full-coverage section and downstream recovery section comprised the heat transfer system. The experimental objectives were to determine, for each geometry, the effects on surface heat flux of injection blowing ratio (M), injection temperature ratio (θ), and upstream initial conditions. Spanwise-averaged Stanton numbers were measured for blowing ratios from 0 to 1.3, and for two values of injection temperature at each blowing ratio. The heat transfer coefficient was defined on the basis of a mainstream-to-wall temperature difference. Initial momentum and enthalpy thickness Reynolds numbers were varied from 500 to about 3000. This paper compares the experimental results for the three injection geometries. In addition, the effects of hole spacing and number of rows of holes were examined.