Effect of Microchannel On the Composite Cooling Performance of a Simulated Turbine Blade Leading Edge

IF 2.8 4区工程技术 Q2 ENGINEERING, MECHANICAL

Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-06-17 DOI:10.1115/1.4062756

Xinnan Chen, Zhigang Li, Jun Li

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Abstract

As the turbine blade leading edge becomes one of the hottest regions in the engine, a microchannel structure was applied to further improve the cooling performance. Adiabatic and conjugate heat transfer analyses were conducted to compare the heat transfer and cooling performance of the leading edge with or without microchannels, while the influence of mass flow rate of coolant was also included. Based on the investigations on the effect of geometrical designs, the flow and composite cooling performance of the microchannels were further optimized. The results indicate that the internal heat transfer intensity was greatly enhanced with the arrangement of microchannels, while the adiabatic film coolant coverage was slightly deteriorated. On this basis, the composite cooling performance of the leading edge was effectively improved by at least 7.54%. However, the flow resistance of film cooling holes was obviously increased due to the obstruction of microchannels, and a larger thickness of microchannels would alleviate this feature. In addition, the composite cooling performance of the leading edge was further optimized by increasing the radius of microchannels, and the same effect was achieved by reducing the spanwise distance between the film cooling holes and the micro-jet holes. Compared with the leading edge model without microchannels, the former design increased the area-averaged overall cooling effectiveness of the leading edge by at least 11.17% under all the mass flow rates of coolant studied in this paper, while the latter design improved the composite cooling performance by at least 12.76%.

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微通道对模拟涡轮叶片前缘复合冷却性能的影响

由于涡轮叶片前缘是发动机中温度最高的区域之一，为了进一步提高冷却性能，采用了微通道结构。通过绝热传热和共轭传热分析，比较了有无微通道时前缘的传热和冷却性能，同时考虑了冷却剂质量流量的影响。在研究几何设计影响的基础上，进一步优化了微通道的流动性能和复合冷却性能。结果表明:微通道的布置大大提高了内部换热强度，而绝热膜冷却剂的覆盖率略有下降;在此基础上，前缘复合冷却性能有效提高了至少7.54%。然而，由于微通道的阻塞，气膜冷却孔的流动阻力明显增加，较大的微通道厚度可以缓解这一特征。此外，通过增加微通道半径进一步优化了前缘的复合冷却性能，并通过减小膜冷却孔与微射流孔之间的展向距离达到同样的效果。与无微通道的前缘模型相比，在本文研究的所有冷却剂质量流量下，前者设计使前缘的面积平均整体冷却效率提高了至少11.17%，后者设计使复合冷却性能提高了至少12.76%。

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来源期刊

Journal of Heat Transfer-transactions of The Asme 工程技术-工程：机械

自引率

0.00%

发文量

182

审稿时长

4.7 months

期刊介绍： Topical areas including, but not limited to: Biological heat and mass transfer; Combustion and reactive flows; Conduction; Electronic and photonic cooling; Evaporation, boiling, and condensation; Experimental techniques; Forced convection; Heat exchanger fundamentals; Heat transfer enhancement; Combined heat and mass transfer; Heat transfer in manufacturing; Jets, wakes, and impingement cooling; Melting and solidification; Microscale and nanoscale heat and mass transfer; Natural and mixed convection; Porous media; Radiative heat transfer; Thermal systems; Two-phase flow and heat transfer. Such topical areas may be seen in: Aerospace; The environment; Gas turbines; Biotechnology; Electronic and photonic processes and equipment; Energy systems, Fire and combustion, heat pipes, manufacturing and materials processing, low temperature and arctic region heat transfer; Refrigeration and air conditioning; Homeland security systems; Multi-phase processes; Microscale and nanoscale devices and processes.