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首页> 外文期刊>International Journal of Heat and Mass Transfer >Endwall thermal performances of radially rotating rectangular channel with pin-fins on skewed rib lands
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Endwall thermal performances of radially rotating rectangular channel with pin-fins on skewed rib lands

机译：倾斜肋骨上带销鳍的径向旋转矩形通道的端壁热性能

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摘要

This experimental study measures the pressure drop coefficients (f) and the full-field endwall Nusselt number (Nu) distributions of a rotating channel fitted with inclined rectangular slender pin-fins through leading and trailing endwalls roughened by skewed ribs with radially outward flow for gas turbine rotor blade cooling applications. Inclinations of pin-fins comply with the rib-induced flows to resonate the heat transfer enhancement (HTE) mechanisms tripped by pin-fins and angled-ribs. By the aid of infrared thermography method to detect the full-field Nu scans over the two opposite rotating ribbed endwalls subject to the influences of Coriolis forces and buoyancy interactions, the combined and isolated effects of Reynolds (Re), rotation {Ro) and buoyancy (Bu) numbers on local and area-averaged heat transfer properties at the conditions of 5000 ≤ Re ≤ 15,000, 0 ≤ Ro ≤ 0.4 and 0.0007 ≤ Bu ≤ 0.31 are parametrically examined. While the endwall Nu distributions still respond the impacts of the rib-wise secondary flows and the horseshoe vortices at pin-endwall junctions, the implantation of slender pin-fins along the wide rib-lands and between two successive angled ribs noticeably modify the typical endwall Nu imprints in a ribbed or pin-fin channel. With rotation, the typical Re, Ro and Bu effects on Nu properties are followed by this compound HTE measure, but the relaxation of pressure gradients by rotation moderates the pressure drop penalties from the non-rotating references, leading to further elevations of thermal performance factors (TPF). A set of selected heat-transfer and pressure-drop data demonstrates the Coriolis and rotating buoyancy effects on Nu,f and TPF properties for present pin-fin ribbed channel. Acting by the combined Coriolis and rotating buoyancy effects, the rotating leading and trailing area-averaged Nusselt numbers (Nu) and the/values are modified respectively to 0.94-1.29 and 1-1.43 and 0.99-0.43 times of the static channel references. To aid design activities, the physically consistent Nu and/correlations were generated to permit the assessments of individual and interdependent Re, Ro and Bu effects on the area-averaged heat transfer properties over leading and trailing endwalls and on the pressure-drop performances.
机译：该实验研究测量了带有倾斜矩形细长针状翅片的旋转通道的压力降系数（f）和全场端壁Nusselt分布（Nu），该通道通过倾斜肋加粗的前端壁和后端壁进行了径向向外的气体流动涡轮转子叶片的冷却应用。针状散热片的倾斜度与肋条引起的流动相符，从而使由针状散热片和斜肋触发的传热增强（HTE）机制产生共振。借助红外热成像方法，在受到科里奥利力和浮力相互作用的影响的两个相对的旋转肋肋端壁上检测全场Nu扫描，雷诺（Re），旋转（Ro）和浮力的组合和隔离效应参数检验了在5000≤Re≤15,000、0≤Ro≤0.4和0.0007≤Bu≤0.31的条件下局部和区域平均传热性能的（Bu）数。尽管端壁的Nu分布仍然可以响应肋向第二流和销钉-端壁交界处的马蹄形涡流的影响，但沿着宽肋骨区域和两个连续的成角度的肋骨之间的细长针鳍的植入明显改变了典型的端壁Nu在肋状或针翅形通道中烙印。在旋转时，此复合HTE度量遵循典型的Re，Ro和Bu对Nu性质的影响，但是旋转引起的压力梯度松弛会缓和非旋转参考中的压降损失，从而导致热性能因子进一步升高（TPF）。一组选定的传热和压降数据证明了对于当前的针翅肋式通道，科里奥利和旋转浮力对Nu，f和TPF特性的影响。受科里奥利效应和旋转浮力作用的共同作用，旋转的前后区域平均努塞尔特数（Nu）和/值分别修改为静态通道参考的0.94-1.29和1-1.43和0.99-0.43倍。为了协助设计活动，生成了物理上一致的Nu和/或相关性，以允许评估各个独立且相互依赖的Re，Ro和Bu对前端壁和后端壁的面积平均传热特性以及压降性能的影响。

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