Effects Of Variable Pressure Outlets For Array Jet Impingement Cooling With A Bidirectional Exit Air Scheme

IF 2.8 4区工程技术 Q2 ENGINEERING, MECHANICAL

Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-08-05 DOI:10.1115/1.4063106

Michael Bonds, G. Iyer, S. Ekkad

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引用次数: 0

Abstract

Array jet impingement in conjunction with other cooling methods such as effusion cooling is used in gas turbine combustion zones to provide optimized cooling in the form of double wall cooling around a combustion chamber. Utilizing a transient liquid crystal (TLC) technique an experimental investigation into the effects of pressure gradients and single versus multiple exits for array jet impingement crossflow is evaluated in the form of a detailed heat transfer analysis. In this study, four pressure gradients to bias mass flow ratios as (1:1), (1:2), (1:3), and (1:0), two jet array configurations either inline or staggered with jet to jet spacings (x/D = y/D) of 1.4, 1.9, and 2.2, three jet to target distances (z/D) ranging from 2-4, and three Reynolds number from 5,000 to 15,000 are considered. In total, a test matrix of 72 different performance conditions was evaluated. Results are presented as local and area averaged Nusselt number plots along with local heat transfer coefficient contours. Overall, Nusselt number decreases with increased (z/D) and increased pressure gradient bias towards a single exit from (1:1) to (1:0). There is also slightly better performance from inline jet array configurations compared to staggered configurations.

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可变压力出口对双向出口阵列射流冲击冷却的影响

阵列射流冲击与其他冷却方法(如射流冷却)一起用于燃气轮机燃烧区，以燃烧室周围双壁冷却的形式提供优化的冷却。利用瞬态液晶(TLC)技术，以详细的传热分析形式评估了压力梯度和单出口与多出口对阵列射流撞击横流的影响。在本研究中，考虑了四种压力梯度与偏置质量流比(1:1)、(1:2)、(1:3)和(1:0)，两种射流阵列配置，射流间距(x/D = y/D)分别为1.4、1.9和2.2，三种射流与目标距离(z/D)为2-4，三种雷诺数为5000 ~ 15000。总共评估了72种不同性能条件的测试矩阵。结果显示为局部和区域平均努塞尔数图以及局部传热系数等高线。总的来说，努塞尔数随着(z/D)的增加和压力梯度偏向于单一出口从(1:1)到(1:0)的增加而减少。与交错配置相比，直列射流阵列配置的性能也稍好一些。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.