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首页> 外文期刊>International Journal of Heat and Mass Transfer >Film cooling sensitivity of laidback fanshape holes to variations in exit configuration and mainstream turbulence intensity
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Film cooling sensitivity of laidback fanshape holes to variations in exit configuration and mainstream turbulence intensity

机译：悠闲的扇形孔对出口结构和主流湍流强度变化的薄膜冷却敏感性

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摘要

Experimental measurements and numerical simulations have been performed to investigate the sensitivity of film cooling of laidback fanshape hole to the variations in hole exit configuration and mainstream turbulence intensity. The measurements are conducted on a flat plate model with low-speed, incompressible mainstream. Film cooling performances of two laidback fanshape hole configurations are measured under four blowing ratios using transient liquid crystal measurement technique which can process the nonuniform initial wall temperature. Hole exit corner shape is changed from sharp corner to round corner to simulate the effect of real manufacturing and/or deposition on the exit configuration of ideal laidback fanshape hole. The lateral film coverage as well as the film cooling effectiveness of laidback fan-shape hole with round corner exit are reduced due to the smaller lateral expansion caused by round corner shape, especially under low turbulence condition. Large mainstream turbulence intensity can enhance the lateral diffusion of film jets which is beneficial to film cooing of laidback fanshape hole with round corner under larger blowing ratios. For the heat transfer coefficient distributions of the two film hole configurations, variation in film hole exit configuration has very small influence on both the spatial features and the averaged values under the same mainstream turbulence conditions. However, the variation in mainstream turbulence intensity has notable influences on the heat transfer coefficient distributions for both film hole configurations, because the enhancement effect of film jets on heat transfer and the strength of counter-rotating vortex pair are different between high and low mainstream turbulence conditions. The discharge coefficients of laidback fanshape hole configurations are not sensitive to the variations in hole exit configuration and mainstream turbulence intensity under the same blowing ratio.
机译：已经进行了实验测量和数值模拟，以研究后倾扇形孔的薄膜冷却对孔出口结构和主流湍流强度变化的敏感性。测量是在具有低速，不可压缩主流的平板模型上进行的。使用瞬态液晶测量技术，可以处理四个不均匀的初始壁温，在四个吹气比下测量两个后备扇形孔结构的薄膜冷却性能。孔出口拐角形状从尖角变为圆角，以模拟实际制造和/或沉积对理想的后置扇形孔出口构造的影响。由于圆角形状引起的横向膨胀较小，特别是在低湍流条件下，侧面圆角覆盖的扇形孔的横向薄膜覆盖率和薄膜冷却效率降低。较大的主流湍流强度可以增强薄膜射流的横向扩散，这有利于在较大的鼓风比下，具有圆角的悠闲扇形孔的薄膜冷却。对于两个薄膜孔构型的传热系数分布，在相同的主流湍流条件下，薄膜孔出口构型的变化对空间特征和平均值的影响都很小。但是，主流湍流强度的变化对两种膜孔构型的传热系数分布都有显着影响，因为在高和低主流湍流之间，膜射流对传热的增强作用和反向旋转涡流对的强度都不同。条件。在相同的吹气比下，后备扇形孔构型的排放系数对孔出口构型和主流湍流强度的变化不敏感。

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