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首页> 外文期刊>International Journal of Heat and Fluid Flow >Evolution of jets effusing from inclined holes into crossflow
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Evolution of jets effusing from inclined holes into crossflow

机译：从倾斜孔进入错流的射流演变

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摘要

The turbulent flow structure and vortex dynamics of a jet-in-a-crossflow (JICF) problem, which is related to gas turbine blade film cooling, is investigated using the particle-image velocimetry (PIV) technique. A cooling jet emanating from a pipe interacts with a turbulent flat plate boundary layer at a Reynolds number Re_∞ = 400,000. The streamwise inclination of the coolant jet is 30° and two velocity ratios (VR = 0.28, VR = 0.48) and two mass flux ratios (MR = 0.28, MR = 0.48) are considered. Jets of air and CO_2 are injected separately into a boundary layer to examine the effects of the density ratio between coolant and mainstream on the mixing behavior and consequently, the cooling efficiency. The results show a higher mass flux ratio to enlarge the size of the recirculation region leading to a more pronounced entrainment of hot outer fluid into the wake of the jet. Furthermore, the lateral spreading of the coolant is strongly increased at a higher density ratio. The results of the experimental measurements are used to validate numerical findings. This comparison shows an excellent agreement for mean velocity and higher moment velocity distributions.
机译：利用粒子图像测速技术（PIV）研究了与燃气轮机叶片薄膜冷却有关的急流（JICF）问题的湍流结构和涡旋动力学。从管道发出的冷却射流与湍流平板边界层相互作用，其雷诺数Re_∞= 400,000。冷却剂射流的流向倾斜度为30°，并考虑了两个速度比（VR = 0.28，VR = 0.48）和两个质量通量比（MR = 0.28，MR = 0.48）。空气和CO_2的射流分别注入边界层中，以检查冷却剂和主流之间的密度比对混合行为以及冷却效率的影响。结果显示出较高的质量通量比，以扩大再循环区域的尺寸，从而导致较热的外部流体更明显地夹带进入喷嘴尾流。此外，冷却剂的横向扩散以更高的密度比大大增加。实验测量的结果用于验证数值结果。这种比较显示出对于平均速度和更高的矩速度分布的极好的一致性。

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