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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical predictions on fluid flow and heat transfer in U-shaped channel with the combination of ribs, dimples and protrusions under rotational effects
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Numerical predictions on fluid flow and heat transfer in U-shaped channel with the combination of ribs, dimples and protrusions under rotational effects

机译：旋转作用下肋，凹痕和突起相结合的U形通道内流体流动和传热的数值预测

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摘要

Recently, dimple and protrusion structure has been proved as an effective heat transfer augmentation approach on coolant channel due to its advantage on pressure penalty. A compound heat transfer enhancement technique, the combination of ribs, dimples or protrusions, is applied to a U-shaped square channel similar with the gas turbine blade internal passage. Considering the rotational condition of gas turbine blade on operation, the effect of rotation is also investigated for the coolant channel in order to approximate more to the real operation condition. Thus, the objective of this study is to discuss the effect of rotation on fluid flow and heat transfer performance of turbine blade similar U-shaped channel with the combination structure of ribs, dimples or protrusions. The investigated Reynolds number is 1.25 million and considered rotational number includes 0, 0.4 and 0.6. From the results, the fluid patterns of two-pass channel with compound heat transfer enhancement structure are presented for none-rotating and rotating cases. Meanwhile, spatially Nusselt distributions of roughened walls are obtained to reveal the heat transfer rates. Finally, the area averaged Nusselt number ratio and channel friction penalty are evaluated. The results indicate that rib-protrusion structure seems to be the most effective structure while rib-dimple structure has only slight advantage than ribbed channel. Furthermore, the additional friction penalty by dimple and protrusion structure is tiny. It can also be expected that, the thermal performance of this compound structure can be even improved after a denser arrangement of dimple/protrusion structure and optimal shape design.
机译：最近，由于其在压力损失方面的优势，凹痕和突起结构已被证明是在冷却剂通道上的有效传热增加方法。一种复合的传热增强技术，是肋，凹痕或突起的组合，被应用于类似于燃气轮机叶片内部通道的U形方形通道。考虑到燃气轮机叶片在运行时的旋转状况，还研究了冷却液通道的旋转影响，以便更接近实际运行状况。因此，本研究的目的是讨论旋转对具有肋，凹痕或突起的组合结构的类似U形通道的涡轮叶片的流体流动和传热性能的影响。研究的雷诺数为125万，考虑的旋转数包括0、0.4和0.6。结果表明，在不旋转和旋转情况下，具有复合传热增强结构的两通通道的流体形态。同时，获得了粗糙壁的空间Nusselt分布，以揭示传热速率。最后，评估了面积平均努塞尔数比和通道摩擦损失。结果表明，肋-凸起结构似乎是最有效的结构，而肋-酒窝结构仅比肋状通道略有优势。此外，由凹痕和突起结构引起的附加摩擦损失很小。还可以预期，在更密集地布置凹痕/凸出结构和最佳形状设计之后，甚至可以改善该复合结构的热性能。

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    Zhongyang Shen; Yonghui Xie; Di Zhang;

  • 作者单位

    School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China;

    School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China;

    Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an,Shaanxi Province 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

    Dimple; Protrusion; Rib; Heat transfer; Rotation; Gas turbine;

    机译：酒窝;突出;肋;传播热量;回转;燃气轮机;

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