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Thermal performance of impinging jet-row onto trapezoidal channel with different effusion and discharge conditions
International Journal of Thermal Sciences ( IF 4.5 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.ijthermalsci.2020.106590
Shyy Woei Chang , Pei-An Chiang , Wei Ling Cai

Abstract The present work was aimed at investigating the effects of row number of effusion holes and coolant discharge ratio from channel tip on the thermal performance of an emulated cooling passage typical in the leading portion of a gas turbine blade. With each effusion and discharge condition, the full-field heat transfer data along with the channel averaged Fanning friction coefficients and thermal performance factors were measured at channel Reynolds numbers of 5000, 7500, 10,000, 12,500 and 15,000 with the corresponding axial distributions of the jet mass flow rate detected. Without effusion, the strong crossflow effects acted with the weakened jet momentum near the sealed channel hub to substantially reduce the regional heat transfer rates. With effusion, the flow confinement formulated by the cavity-like channel hub and the crossflow developed along the test channel were suppressed, leading to the even distribution of jet flow and the recovered impinging-jet heat transfer properties over the channel hub region. While the row number of effusion holes affected the overall heat transfer properties, the impacts of tip extraction were less evident; but the overall heat transfer performance was improved by reducing tip discharge. With leading-edge cooling applications to a gas turbine blade, three sets of heat-transfer and pressure-drop correlations were devised.

中文翻译:

不同射流和排流条件下射流冲击梯形通道的热性能

摘要 目前的工作旨在研究喷流孔的行数和通道尖端的冷却剂排放比对典型的燃气轮机叶片前部模拟冷却通道热性能的影响。在每种流出和排放条件下,在通道雷诺数为 5000、7500、10,000、12,500 和 15,000 以及相应的射流轴向分布时测量全场传热数据以及通道平均范宁摩擦系数和热性能因子检测到质量流量。在没有积液的情况下,强烈的横流效应与密封通道枢纽附近减弱的射流动量一起作用,从而大大降低了区域传热率。带着渗液,由腔状通道毂形成的流动限制和沿测试通道发展的横流被抑制,导致射流的均匀分布和在通道毂区域恢复的冲击射流传热特性。虽然排液孔的排数影响了整体传热性能,但尖端提取的影响不太明显;但通过减少尖端排放提高了整体传热性能。在燃气轮机叶片的前沿冷却应用中,设计了三组传热和压降相关性。虽然排液孔的排数影响了整体传热性能,但尖端提取的影响不太明显;但通过减少尖端排放提高了整体传热性能。在燃气轮机叶片的前沿冷却应用中,设计了三组传热和压降相关性。虽然排液孔的排数影响了整体传热性能,但尖端提取的影响不太明显;但通过减少尖端排放提高了整体传热性能。在燃气轮机叶片的前沿冷却应用中,设计了三组传热和压降相关性。
更新日期:2021-01-01
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