Comparisons of Overall Performance among Double-jet Film Cooling Holes, Cylinder holes, and Fan-shaped holes

IF 1.9 4区工程技术 Q2 ENGINEERING, MECHANICAL Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-09-08 DOI:10.1115/1.4063351

Jiang Lei, Jiaxu Yao, Jianhong He, Xi Yang, Kecheng Zhang, Lesley Wright

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Abstract

In this paper, the film-cooling effectiveness (?) and heat transfer coefficient (h) of different film hole geometries are investigated, including double-jet film cooling (DJFC) holes, streamwise cylindrical holes, and fan-shaped holes, both experimentally and numerically. Results reveal that when the blowing ratio is less than 1.0, the DJFC holes have the highest ? and the highest h, as well as the highest net heat flux reduction (NHFR). However, a higher blowing ratio (>1.0) leads to a quickly decreasing NHFR of DJFC holes. The asymmetric anti-kidney vortex and the high turbulent kinetic energy (TKE) are dominant in the performance of the DJFC holes. Owing to medium effectiveness and the lowest heat transfer coefficient, the fan-shaped holes possess the highest net heat flux reduction at M=2.0 although the value is negative. The relatively weak kidney vortex and the low TKE can explain the phenomena. The cylindrical holes have the lowest ? and the lowest NHFR due to the kidney vortex and relatively higher TKE.

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双射流膜冷却孔、圆柱孔和扇形孔的综合性能比较

本文采用实验和数值方法研究了不同形状的膜孔，包括双射流膜冷却孔(DJFC)、流向圆柱孔和扇形孔的膜冷却效率和传热系数。结果表明，当吹气比小于1.0时，DJFC孔的孔径最大。h值最高，净热通量减少值(NHFR)最高。而吹气比越高(>1.0)，DJFC孔NHFR下降越快。非对称反肾涡和高湍流动能(TKE)是影响DJFC孔性能的主要因素。由于效率中等，换热系数最低，在M=2.0时，扇形孔的净热流减少量最大，尽管M=2.0为负值。较弱的肾涡和较低的TKE可以解释这一现象。圆柱孔有最低的?由于肾涡和相对较高的TKE, NHFR最低。

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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.