The dynamics of oblique detonation waves in non-uniform inflows: Flame structure and stability

IF 6.2 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2026-05-01 Epub Date: 2026-02-27 DOI:10.1016/j.combustflame.2026.114886

Yichen Zhang , Xiaojing Zheng , Gaoxiang Xiang

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Abstract

The successful operation of oblique detonation wave (ODW) engines is critically dependent on the stability of the detonation wavefront under realistic, non-uniform inflow conditions, a phenomenon that remains inadequately understood. This study employs two-dimensional simulations with a detailed H₂/air mechanism to systematically elucidate the dynamic response of ODW structures to both gradient-type and sine-type inhomogeneities in equivalence ratio, pressure, temperature, and velocity. Results reveal that gradient-type inflows induce progressive deflection of the wavefront and alter the transition locus, whereas sine-type non-uniformities trigger periodic modulation, leading to distinctive flame dynamics including cellular patterns and localized extinction-reignition cycles. Crucially, large-amplitude oscillations are found to provoke decoupling of the shock and reaction fronts, defining critical stability boundaries. These findings provide fundamental insights into the coupling between inflow perturbations and detonation combustion, offering vital guidelines for the robust design of hypersonic propulsion systems.

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非均匀流入中斜爆震波的动力学：火焰结构和稳定性

斜爆震波（ODW）发动机的成功运行在很大程度上取决于爆震波前在现实的非均匀流入条件下的稳定性，这一现象仍然没有得到充分的了解。本研究通过二维模拟H2/空气的详细机理，系统地阐明了ODW结构对梯度型和正弦型非均匀性在等效比、压力、温度和速度方面的动态响应。结果表明，梯度型流入引起波前逐渐偏转并改变过渡轨迹，而正弦型非均匀性引发周期性调制，导致独特的火焰动力学，包括细胞模式和局部熄灭-重燃循环。至关重要的是，发现大振幅振荡会引起冲击和反应锋面的解耦，从而定义临界稳定性边界。这些发现对流入扰动和爆轰燃烧之间的耦合提供了基本的见解，为高超声速推进系统的鲁棒设计提供了重要的指导。

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.