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Journal of Thermal Science

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2025 , Vol. 34 >Issue 2: 524 - 541

DOI: https://doi.org/10.1007/s11630-024-2073-2

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Flow and Heat Transfer of Hydrocarbon Fuel in a Channel with Staggered-Side-Gap Micro Ribs

  • JIANG Yuguang ,
  • QI Yongjian ,
  • WANG Leqing ,
  • LIN Yong ,
  • FAN Wei
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  • School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China

网络出版日期: 2025-03-05

基金资助

This paper is sponsored by the National Natural Science Foundation of China (No. 51906207, No. U22B2091), the Young Elite Scientists Sponsorship Program by CAST (2021QNRC001) and Technical Field Foundation (2021-JCJQ-JJ-0342). The authors thank the reviewers for their valuable advice on this paper.

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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Flow and Heat Transfer of Hydrocarbon Fuel in a Channel with Staggered-Side-Gap Micro Ribs

  • JIANG Yuguang ,
  • QI Yongjian ,
  • WANG Leqing ,
  • LIN Yong ,
  • FAN Wei
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  • School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China

Online published: 2025-03-05

Supported by

This paper is sponsored by the National Natural Science Foundation of China (No. 51906207, No. U22B2091), the Young Elite Scientists Sponsorship Program by CAST (2021QNRC001) and Technical Field Foundation (2021-JCJQ-JJ-0342). The authors thank the reviewers for their valuable advice on this paper.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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摘要

在高超声速飞行过程中，超燃冲压发动机面临着极端的热环境，这对发动机的冷却技术提出了严峻挑战。采用碳氢燃料的再生冷却技术被认为是一种有前景的解决方案，其中碳氢燃料通过微通道（200微米至3毫米）流动换热以吸收燃烧产生的热量。由于机载碳氢燃料严格受限，传热恶化和超温现象极有可能发生。在本文中，引入了具有交错侧隙的微肋，并对其进行了数值研究，以强化换热。与直线通道和带有直线微肋的通道相比，交错侧隙能够减轻局部低速区域并强化纵向和横向的涡流，换热效果显著增强。较大的肋高通过更强的侧隙效应强化传热，但代价是更大的压降损失。综合换热因子η在h/H=0.1的情况下为最优，与直线通道相比提高了204.5%。当肋间隔过小或过大时，其性能接近直线通道。综合换热因子η在L/p=100的情况下为最优，与直线通道相比提高了212.9%。已知微肋的几何形状改进，即交错侧隙微肋，能够诱导额外的横向涡流，更有效地改善换热性能。本文的研究为超燃冲压发动机的冷却结构设计提供了支持。

关键词： micro rib; staggered side gap; heat transfer enhancement; hydrocarbon fuel; regenerative cooling

本文引用格式

JIANG Yuguang , QI Yongjian , WANG Leqing , LIN Yong , FAN Wei . Flow and Heat Transfer of Hydrocarbon Fuel in a Channel with Staggered-Side-Gap Micro Ribs[J]. 热科学学报, 2025 , 34(2) : 524 -541 . DOI: 10.1007/s11630-024-2073-2

Abstract

SCRamjet is exposed to severe thermal environments during hypersonic flights, which poses a serious challenge to the engine cooling technology. Regenerative cooling with hydrocarbon fuel is considered promising, in which the hydrocarbon fuel flows through micro channels (200 μm–3 mm) to absorb the combustion heat release. With strictly limited hydrocarbon fuel onboard, heat transfer deterioration and over-temperature are highly possible. In this paper, micro ribs with staggered side gaps are introduced and numerically studied to enhance the heat transfer. Compared with the straight channel and channel with straight micro ribs, the staggered side gaps alleviate the local low velocity zone and intensify the longitudinal and transverse vortexes. The heat transfer is obviously enhanced. Larger rib height enhances the heat transfer by stronger side gap effects at the cost of larger pressure loss. The best overall heat transfer factor η is achieved in the case of hrib/H=0.1, which increases by 204.5% comparing to the straight channel. When the rib interval is too small or too large, it approaches to the straight channel. The best overall heat transfer factor η is achieved in the case of L/prib=100, which increases by 212.9% comparing to the straight channel. It is known the improvement in the geometry of the ribs, i.e., the staggered-side-gap micro ribs, induces extra transverse vortex and improves the heat transfer performance more effectively. The research of this paper provides support for the cooling design of the SCRamjet.

Key words： micro rib; staggered side gap; heat transfer enhancement; hydrocarbon fuel; regenerative cooling

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