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首页> 外文期刊>International Journal of Heat and Mass Transfer >Investigation on the mixing mechanism of single-jet film cooling with various blowing ratios based on hybrid thermal lattice Boltzmann method
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Investigation on the mixing mechanism of single-jet film cooling with various blowing ratios based on hybrid thermal lattice Boltzmann method

机译：基于混合热格子玻尔兹曼方法的不同吹塑比的单喷膜冷却混合机理研究

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摘要

Massive parallel simulation applied multiple graphic processing units (multi-GPUs) is carried out to perform an in-depth investigation on the mixing mechanism between hot crossflow and coolant jet flow in film cooling with large eddy simulation (LES) based on hybrid thermal lattice Boltzmann method (HTLBM). A coolant jet is injected at an inclined angle of α = 30° into a turbulent flat plate boundary layer profile with a Re = 4000 free-stream Reynolds number. Three blowing ratios ranging from 0.2 to 0.8 are studied. A three-part definition on jet-crossflow-interaction region is proposed. They are shear domain, rotating domain, and dissipation domain, respectively. In shear domain, the turbulent-kinetic-energy (TKE) value is quite small and the coolant film is stable. In rotating domain, crossflow mixes with jet flow violently and coolant film loses stability gradually. The great turbulent-dissipation effect in dissipation domain causes large energy loss and disappearing of counterrotating vortex pair, which results in the poor thermal protection and coolant film collapses. Moreover, under different blowing ratios, quite different states of microscopic flow structures are presented, which causes different macroscopic heat transfer behaviors. On the other hand, the present simulation with 165 million grids is fulfilled on 9 K20M GPUs applying CUDA-MPI and a high computational performance of 896.35 MLUPS is achieved.
机译：基于混合热晶格玻尔兹曼，采用大型涡模拟（LES），对应用多图形处理单元（multi-GPU）的大规模并行仿真进行了深入研究，以研究薄膜冷却中热错流与冷却剂射流的混合机理。方法（HTLBM）。冷却剂射流以α= 30°的倾斜角注入具有Re = 4000自由流雷诺数的湍流平板边界层轮廓中。研究了三种吹塑比，范围从0.2到0.8。提出了射流-横流-相互作用区域的三部分定义。它们分别是剪切域，旋转域和耗散域。在剪切域中，湍流动能（TKE）值很小，冷却液膜很稳定。在旋转域中，错流与射流剧烈混合，冷却液膜逐渐失去稳定性。消散区域中的巨大湍流消散效果导致大量能量损失和反向旋转的涡流对消失，从而导致较差的热保护和冷却液膜塌陷。此外，在不同的吹风比下，呈现出非常不同的微观流动结构状态，从而导致不同的宏观传热行为。另一方面，在9个使用CUDA-MPI的K20M GPU上完成了具有1.65亿个网格的当前仿真，并且实现了896.35 MLUPS的高计算性能。

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    Yanqin Shangguan; Xian Wang; Yueming Li;

  • 作者单位

    State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, 28 Xianning West Road, Xi'an, Shaanxi 710049, China Shaanxi Key Laboratory of Environment and Control for Flight Vehicle, School of Aerospace, Xi'an Jiaotong University, 28 xianning west road, Xi'an, Shaanxi 710049, China;

    State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, 28 Xianning West Road, Xi'an, Shaanxi 710049, China Shaanxi Key Laboratory of Environment and Control for Flight Vehicle, School of Aerospace, Xi'an Jiaotong University, 28 xianning west road, Xi'an, Shaanxi 710049, China;

    State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, 28 Xianning West Road, Xi'an, Shaanxi 710049, China Shaanxi Key Laboratory of Environment and Control for Flight Vehicle, School of Aerospace, Xi'an Jiaotong University, 28 xianning west road, Xi'an, Shaanxi 710049, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lattice Boltzmann method; Large eddy simulation; Film cooling; Mixing mechanism; Multiple graphic processing units;

    机译：格子波尔兹曼法大涡模拟;薄膜冷却;混合机制;多个图形处理单元;

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