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首页> 外文期刊>Advances in Mechanical Engineering >Numerical Study on Flow and Heat Transfer Performance of Rectangular Heat Sink with Compound Heat Transfer Enhancement Structures
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Numerical Study on Flow and Heat Transfer Performance of Rectangular Heat Sink with Compound Heat Transfer Enhancement Structures

机译：复合传热强化结构矩形散热片流动与传热性能的数值研究

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Modern gas turbine blade is operating at high temperature which requires abundant cooling. Considering both heat transfer rate and pumping power for internal passages, developing efficient cooling passages is of great importance. Ribbed channel has been proved as effective heat transfer enhancement technology for considerable heat transfer characteristics; however, the pressure loss is impressive. Dimple and protrusion are frequently considered as new heat transfer augmentation tools for their low friction loss in recent years. Numerical simulations are adopted to investigate the thermal performance of rectangular channel with compound heat transfer enhancement structures with ribs, dimples, and protrusions. Among all configurations, the nondimensional dimple/protrusion depths are 0.2. The results present the flowstructures of all channel configurations. The Nu/Nu(0) distributions of channel section are discussed for each case. The pressure penalty f/f(0) and the thermal performance TP are also considered as important parameters for heat transfer enhancement. It can be concluded that the optimal structure of the compound heat transfer enhancement structure is rib + protrusion (D=6mm) + dimple (D=15mm).
机译：现代燃气涡轮叶片在高温下运行，这需要充分的冷却。考虑到内部通道的传热速率和泵送功率，开发有效的冷却通道非常重要。肋通道已被证明是有效的传热增强技术，具有相当大的传热特性。但是，压力损失是惊人的。近年来，酒窝和突出物因其低摩擦损失而经常被认为是新的传热增强工具。采用数值模拟研究具有肋，凹痕和突起的复合传热增强结构的矩形通道的热性能。在所有配置中，无量纲的凹痕/突出深度为0.2。结果显示了所有通道配置的流动结构。针对每种情况讨论了通道部分的Nu / Nu（0）分布。压力损失f / f（0）和热性能TP也被认为是增强传热的重要参数。可以得出结论，复合传热增强结构的最佳结构是肋+突起（D = 6mm）+凹痕（D = 15mm）。

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