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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental and numerical study of the anti-crossflows impingement cooling structure
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Experimental and numerical study of the anti-crossflows impingement cooling structure

机译：防横流冲击冷却结构的实验与数值研究

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摘要

The jet impingement array is a commonly used cooling structure for modern HPT vanes. The spend coolant from upstream impingement holes (crossflows) can disrupt and deflect the downstream jets in the array leading to a decrease in heat transfer intensity. A novel multi-row impingement cooling structure, named the Anti-Crossflows (ACF) cooling structure, that could reduce the negative effect of crossflows was studied for the cooling of convectively cooled vanes. The ACF impingement cooling structure uses the corrugated impingement plate to increase the sectional area for the outflow of crossflows. More than 20 experiments with transient liquid crystal (TLC) measurements under different geometry and Reynolds number were applied to validate the numerical methods. The flow and heat transferring characteristics of the prototype and ACF impingement cooling structure were thoroughly investigated by a set of numerical studies based on 3D RANS methods. It was found that the novel ACF impingement cooling structure had better cooling performance compared with traditional impingement cooling, including lower flow resistance and more homogeneous heat transferring intensity on the target surface. This is because the increased sectional area for crossflows reduces the momentum of crossflows at the downstream impingement jets, and the disruption and deflection on jet flows are significantly weakened. Furthermore, the ACF impingement cooling structure was implemented in a convectively cooled turbine vane and investigated numerically. The results showed that the ACF impingement cooling structure was promising for the vane by improving the performance of vane cooling system. The partial wall temperature of the vane was reduced by 10-30 K with the same pressure drop and mass flow of cooling air.
机译：射流冲击阵列是现代HPT叶片常用的冷却结构。来自上游撞击孔（错流）的废冷却剂会破坏阵列中的下游射流并使之偏转，从而导致传热强度降低。对流冷却叶片的冷却，研究了一种新型的多行冲击冷却结构，称为反横流（ACF）冷却结构，该结构可以减少错流的负面影响。 ACF冲击冷却结构使用波纹冲击板来增加横流流出的截面积。应用了20多个不同几何形状和雷诺数的瞬态液晶（TLC）测量实验，以验证数值方法。通过基于3D RANS方法的一组数值研究，彻底研究了原型和ACF冲击冷却结构的流动和传热特性。研究发现，新型ACF冲击冷却结构与传统的冲击冷却相比具有更好的冷却性能，包括更低的流阻和更均匀的目标表面传热强度。这是因为增加的横流截面积减小了下游冲击射流处横流的动量，并且大大减小了射流的扰动和偏转。此外，ACF冲击冷却结构是在对流冷却的涡轮叶片中实现的，并进行了数值研究。结果表明，通过改善叶片冷却系统的性能，ACF冲击冷却结构对叶片是有希望的。在相同的压降和冷却空气质量流量的情况下，叶片的部分壁温降低了10-30K。

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  • 作者

    Zhongran Chi; Rui Kan; Jing Ren; Hongde Jiang;

  • 作者单位

    Gas Turbine Institute, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    Gas Turbine Institute, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    Gas Turbine Institute, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    Gas Turbine Institute, Department of Thermal Engineering, Tsinghua University, Beijing 100084, 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

    Turbine cooling; Impingement; Crossflow;

    机译：涡轮冷却;撞击横流;

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