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Thermal performance of radially rotating two-pass S-shaped zig-zag channel

机译:径向旋转的两通S字形通道的热性能

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摘要

The detailed Nusselt number distributions, Fanning friction coefficients and thermal performance factors of a radially rotating two-pass square S-shaped zig-zag channel are measured. The fanning friction coefficients are measured from the inner and outer sidewalls, as well as from the leading and trailing end-walls of the rotating channel. At the criterion of constant pumping power consumptions, the thermal performance factors (TPF) are evaluated. The test conditions specified by Reynolds number (Re), rotation number (Ro), density ratio (Δρ/ρ) and buoyancy number (Bu) are 5000 ≤ Re ≤ 15,000, 0≤Ro≤0.5, 0.03 ≤ Δρ/ρ ≤ 0.12 and 0.0049 ≤Bu≤ 0.15. The individual and combined impacts of Reynolds number, rotation number and buoyancy number on the endwall heat transfer properties for present rotating channel are illustrated using a selective set of heat transfer data. Acting by the Coriolis and rotating buoyancy forces to modify the flow structures, the area averaged Nusselt number ratios between the rotating and static channels for the leading and trailing endwalls fall in the respective ranges of 0.93-2.34 and 0.91-2.25. The heat transfer correlations which permit the evaluations of individual and interdependent effects of rotation number and buoyancy number on the regionally averaged Nusselt numbers over the rotating inlet leg, outlet leg and bend region are devised. Correlations evaluating the Fanning friction coefficients of the inner, outer, leading and trailing channel walls are also developed for present rotating channel. Due to the combined Re, Ro and Bu effects on the heat transfer properties and pressure drop performances of present S-shaped two-pass channel, the area averaged Nusselt numbers on leading and trailing endwalls are respectively raised to 3.17-6.83 and 3.22-6.92 times of the Dittus-Boelter Nusselt number (Nu_∞) references. With the accompanying thermal performance factors in the range of 1.25-2.04 at all the static and rotating test conditions, present S-shaped two-pass channel appears as an efficient heat transfer enhancement method with cooling applications to gas turbine blades.
机译:测量了径向旋转的两通道正方形S形之字形通道的详细Nusselt数分布,范宁摩擦系数和热性能因子。扇形摩擦系数是从内侧壁和外侧壁以及旋转通道的前端壁和后端壁测量的。以恒定的泵浦功耗为标准,评估热性能因子(TPF)。雷诺数(Re),转数(Ro),密度比(Δρ/ρ)和浮力数(Bu)指定的测试条件为5000≤Re≤15,000、0≤Ro≤0.5、0.03≤Δρ/ρ≤0.12并且0.0049≤Bu≤0.15。使用一组选择性的传热数据说明了雷诺数,转数和浮力数对当前旋转通道的端壁传热特性的单独影响和综合影响。通过科里奥利力和旋转浮力来修改流动结构,前端壁和后端壁的旋转通道和静态通道之间的面积平均努塞尔数比分别处于0.93-2.34和0.91-2.25的范围内。设计了传热相关性,可以评估旋转数的入口和出口,出口和弯曲区域的旋转数和浮力数对区域平均努塞尔数的个体和相互影响。还为当前的旋转通道开发了评估通道内,外,前和后壁的范宁摩擦系数的相关性。由于结合了Re,Ro和Bu对当前S形两通通道的传热特性和压降性能的影响,前端壁和尾端壁上的面积平均Nusselt数分别提高到3.17-6.83和3.22-6.92 Dittus-Boelter Nusselt编号(Nu_∞)参考的时间。在所有静态和旋转测试条件下,伴随的热性能系数在1.25-2.04范围内,当前的S形两通通道似乎是一种有效的传热增强方法,可应用于燃气轮机叶片的冷却。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2017年第ptab期|1011-1031|共21页
  • 作者单位

    Department of System and Naval Mechatronic Engineering, National Cheng Kung University, No.1, University Road, Tainan City 701, Taiwan, ROC;

    Heat Transfer Laboratory, Department of Mechanical and Automation Engineering, Da-Yen University, No. 168, University Road, Dacun, Changhua 51591, Taiwan, ROC;

    Aeronautical Systems Research Division, National Chung-Shan Institute of Science and Technology, P.O. Box 90008-11-2, Taichung 40722, Taiwan, ROC;

    Aeronautical Systems Research Division, National Chung-Shan Institute of Science and Technology, P.O. Box 90008-11-2, Taichung 40722, Taiwan, ROC;

    Department of Marine Engineering, National Kaohsiung Marine University, No. 142, Haijhuan Road, Nanzih District, Kaohsiung City 81143, Taiwan, ROC;

    Department of Mechanical and Automation Engineering, Da-Yeh University, No. 168, University Road, Dacun, Changhua 51591, Taiwan, ROC;

  • 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

    Rotating S-channel; Passive HTE; Rotor blade cooling;

    机译:旋转S通道;被动HTE;转子叶片冷却;
  • 入库时间 2022-08-18 00:18:07

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