Investigating the combustion-flow coupling effects in a cavity-based scramjet combustor

IF 6.2 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-09-20 DOI:10.1016/j.combustflame.2025.114485

Ming Yan , Ye Tian , Jialing Le , Ji Li , Changchun Yan , Wenyan Song

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Abstract

This study investigates combustion-flow interactions within a scramjet combustor, examining how varying fuel equivalence ratios influence flow characteristics and combustion performance. By employing numerical simulations and experimental validations, we explore the dynamic interplay between combustion flames, shock waves, and localized flow fields, aiming to elucidate the evolution laws governing flow dynamics and flame propagation. The findings reveal that the recirculation zone within the cavity undergoes continuous disassembly and merging, inducing periodic oscillations in the flow field with a cycle duration of 3.6 ± 0.2 ms. Hydrogen injection stabilizes the flow field by balancing upstream and downstream pressures, thereby creating a structured mixing flow field. Furthermore, under reacting flow conditions, a pre-combustion shock train forms due to the combined effects of heat release from combustion and compression caused by fuel injection. Notably, at a fuel equivalence ratio of 0.398, reducing hydrogen supply causes a shift in the combustion regime, accompanied by decreased heat release and weakened shock train intensity. The specific impulse reaches its maximum at a ratio of 0.453, while flow uniformity at the combustor exit is optimized at 0.496. This study contributes to the understanding of complex combustion-flow interactions in scramjet engines, offering valuable insights into optimizing engine performance.

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腔型超燃冲压发动机燃烧室燃烧-流动耦合效应研究

本研究考察了超燃冲压发动机燃烧室内的燃烧-流动相互作用，考察了不同燃料当量比对流动特性和燃烧性能的影响。通过数值模拟和实验验证，探讨了燃烧火焰、激波和局部流场之间的动态相互作用，旨在阐明流动动力学和火焰传播的演化规律。研究结果表明，腔内循环区经历了连续的拆卸和合并过程，引起了流场的周期振荡，周期持续时间为3.6±0.2 ms。注氢通过平衡上下游压力来稳定流场，从而形成一个结构化的混合流场。此外，在反应流动条件下，由于燃烧释放的热量和燃油喷射引起的压缩的综合影响，形成了燃烧前的冲击序列。值得注意的是，当燃料当量比为0.398时，氢气供应的减少会导致燃烧状态的改变，同时伴随着热量释放的减少和冲击列车强度的减弱。比冲在0.453时达到最大值，而燃烧室出口流动均匀性在0.496时达到最优。这项研究有助于理解超燃冲压发动机中复杂的燃烧-流动相互作用，为优化发动机性能提供有价值的见解。

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

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.