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The Effects of Counterrotating Vortex Pair Intensity on Film-Cooling Effectiveness

机译：反向涡对强度对薄膜冷却效果的影响

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摘要

The current investigation clarifies the key factor on the film cooling effectiveness, which is the fundamental of the film cooling research. Conventionally, the momentum flux ratio is thought as the most critical factor on the film cooling effectiveness, and the counterrotating vortex pair (CRVP) also has significant impact. A new scheme named the nozzle scheme has been created to separate the momentum flux ratio and control the CRVP intensity. Three configurations of the nozzle scheme and the baseline have been simulated numerically under density ratio of 2 and blowing ratios that varied from 0.5 to 2. The results demonstrate that the CRVP intensity, instead of the momentum flux ratio, is the most critical factor governing the film-cooling effectiveness, and the mainstream direction component is its main component. Therefore, its two compositions, which are the corresponding velocity gradients, naturally become the key parameters considered in the design of new film cooling geometry.
机译：当前的研究阐明了薄膜冷却效果的关键因素，这是薄膜冷却研究的基础。传统上，动量通量比被认为是影响薄膜冷却效果的最关键因素，并且反向旋涡对（CRVP）也具有重要影响。已经创建了一种称为喷嘴方案的新方案，以分离动量通量比并控制CRVP强度。在密度比为2和吹塑比为0.5到2的情况下，对喷嘴方案和基线的三种配置进行了数值模拟。结果表明，CRVP强度而不是动量通量比是控制喷油嘴的最关键因素。薄膜的冷却效果，而主流方向的成分是其主要成分。因此，它的两个成分，即相应的速度梯度，自然成为新的薄膜冷却几何结构设计中考虑的关键参数。

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  • 来源
    《Heat Transfer Engineering》 |2015年第18期|1360-1370|共11页
  • 作者

    HAO MING LI; IBRAHIM HASSAN;

  • 作者单位

    Department of Mechanical Engineering, Concordia University, Montreal, Canada;

    Department of Mechanical Engineering, Concordia University, 1515 St. Catherine W., EV4-213, Montreal, Quebec, Canada H3G 2W1,Department of Mechanical Engineering, Texas A&M University at Qatar, Doha, Qatar;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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