Abstract Provided are numerically predicted flow structural data for a flow passage with an impingement jet array, as well as numerically predicted surface Nusselt number data for the target surface of the passage, which are obtained using a SST turbulence closure model. The closure model and numerical prediction approach are validated by oil film flow visualization experimental results. Spatially averaged Nusselt number data are well represented by the impingement cooling temperature ratio correlation equation of Goodro et al., which indicates that associated Nusselt number ratios decrease as the Tw/To,in temperature ratio increases to values as high as 2.0. Local, spatially resolved Nusselt numbers and spanwise-averaged surface Nusselt number distributions for TR = 1.1 are consistently higher than TR = 2.0 values, when compared at particular surface locations. Cross flow influences are evidenced by spanwise-averaged, periodically varying Nusselt number values which generally increase with streamwise development. When surface oil flow visualization results are considered with numerically predicted turbulent viscosity ratio results, flow features include locally increased viscosity ratio values near impingement jet stagnation regions, horseshoe vortex signatures, and more focused and more narrow viscosity ratio distributions with streamwise development.

中文翻译：

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冷却剂和壁温变化对冲击射流阵列热性能的影响

摘要 提供了具有冲击射流阵列的流道的数值预测流动结构数据，以及使用SST湍流闭合模型获得的通道目标面的数值预测面努塞尔数数据。油膜流动可视化实验结果验证了闭合模型和数值预测方法。Goodro 等人的冲击冷却温度比相关方程很好地表示了空间平均 Nusselt 数数据，这表明相关的 Nusselt 数比随着 Tw/To,in 温度比增加到高达 2.0 的值而降低。TR = 1.1 的局部空间分辨 Nusselt 数和展向平均表面 Nusselt 数分布始终高于 TR = 2.0 值，在特定表面位置进行比较时。横流影响由展向平均、周期性变化的 Nusselt 数值证明，该数值通常随着流向发展而增加。当表面油流可视化结果与数值预测的湍流粘度比结果一起考虑时，流动特征包括在撞击射流停滞区域附近局部增加的粘度比值、马蹄形涡旋特征，以及更集中和更窄的粘度比分布随流向发展。