Influence of porous media on heat transfer of hydrocarbon fuel in the regenerative cooling channel under different heating surfaces

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2024-10-01 DOI:10.1016/j.tsep.2024.103014

Yongqian Xie, Hao Liu, Hui Shi, Xingzhen Zhu, Yulei Guan

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Abstract

The regenerative cooling technology which uses endothermic hydrocarbon fuel as coolant provides guarantee for the efficient operation of scramjet. The porous medium used in the regenerative cooling channel can enhance heat transfer to increase the heat sink of hydrocarbons due to its high thermal conductivity. To further elucidate the effect of porous media in the actual regenerative cooling, this paper constructs a three-dimensional cooling channel filled with porous media under different heating surfaces in the numerical simulations. The simulation results show that the buoyancy of fuel fluid under different heating surfaces is different, causing different behavior of the fluid flow direction on the cross section. Bottom heating produces the best heat transfer effect in the regenerative cooling channels with/without porous media. When porous medium is added in the cooling channel, its high thermal conductivity is conducive to energy transport, leading to the reduction of the density stratification and temperature non-uniformity coefficient, and the outlet temperature and heat sink of fuel fluid are increased. In addition, the obstructing effect of porous media causes the cross-sectional fluid flow direction to change in the cooling channel, and the most significant obstruction is observed in the case of the top heating process.

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多孔介质对不同加热表面下再生冷却通道中碳氢化合物燃料传热的影响

使用碳氢化合物燃料作为冷却剂的再生冷却技术为争气式喷气发动机的高效运行提供了保障。再生冷却通道中使用的多孔介质由于具有高导热性，可以增强热传递以增加碳氢化合物的散热量。为了进一步阐明多孔介质在实际再生冷却中的作用，本文在数值模拟中构建了一个在不同加热面下充满多孔介质的三维冷却通道。模拟结果表明，不同加热面下燃料流体的浮力不同，导致横截面上流体的流动方向也不同。在有/无多孔介质的再生冷却通道中，底部加热的传热效果最好。在冷却通道中加入多孔介质后，其较高的导热性有利于能量传输，导致密度分层和温度不均匀系数降低，燃料流体的出口温度和散热量提高。此外，多孔介质的阻塞效应会导致冷却通道中的横截面流体流向发生变化，其中顶部加热过程中的阻塞最为明显。

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

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

期刊介绍： Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.