High-fidelity LES of pin fin-jet configuration effects on supercritical n-decane flow and heat transfer in regenerative cooling channels

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-10-10 DOI:10.1016/j.ijthermalsci.2025.110378

Jin Zhang , Yong Li , Yingchun Zhang , Jiajie Zhang , Gongnan Xie , Bengt Sunden

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Abstract

Active regenerative cooling technology is well-suited for extreme operating conditions characterized by high temperatures and intense thermal loads, serving as a highly effective approach for reducing combustion chamber wall temperatures. Large Eddy Simulation (LES) is employed to investigate the thermo-hydraulic characteristics of supercritical n-decane in a jet-regeneration cooling channel with the pin fin, focusing on the critical yet underexplored effects of pin fin-jet spatial configurations. The results indicate that the fluid flow within the jet-regeneration cooling channel gradually evolves towards a quasi-steady state, accompanied by the breakdown process of large-scale vortex structures into small-scale turbulence. The introduction of the pin fin significantly enhances the distribution stability of the thermophysical properties of supercritical n-decane, facilitating uniform temperature field transfer and thereby boosting the overall heat transfer efficiency of the channel. Compared to the pin fin placement schemes in front of and directly below the jet, positioning the pin fin behind the jet effectively leverages the high turbulence intensity in the jet wake region, achieving an optimal balance between heat transfer enhancement and flow resistance suppression. Compared to the flat channel, this configuration leads to an average increase of 3.29 % in the Nusselt number (Nu) throughout 0–1.8 s, with an instantaneous maximum enhancement of 32.6 %. The Thermal-Hydraulic Performance Factor (HTPF) is notably superior to the benchmark value of unity, underscoring its comprehensive performance advantages.

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引脚鳍-射流结构高保真LES对再生冷却通道内超临界正癸烷流动和传热的影响

主动蓄热式冷却技术非常适合高温和高热负荷的极端工况，是降低燃烧室壁面温度的有效方法。采用大涡模拟（LES）研究了超临界正癸烷在带引脚鳍的射流再生冷却通道中的热水力特性，重点研究了引脚鳍-射流空间构型的重要影响。结果表明：射流再生冷却通道内的流体流动逐渐向准稳态发展，伴随着大尺度涡旋结构向小尺度湍流的分解过程；引脚鳍的引入显著增强了超临界正癸烷热物性分布的稳定性，有利于温度场的均匀传递，从而提高了通道的整体换热效率。与在射流正前方和正下方放置引脚片的方案相比，将引脚片放置在射流后方有效地利用了射流尾迹区域的高湍流强度，实现了强化传热和抑制流动阻力之间的最佳平衡。与平坦通道相比，该结构在0-1.8 s内平均增加了3.29%的努塞尔数（Nu），瞬时最大增强为32.6%。热工性能系数（HTPF）明显优于unity基准值，体现了其综合性能优势。

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

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.