Destabilization mechanism of oblique detonation induced by the recirculation zone in a channel flow

IF 6.2 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-08-11 DOI:10.1016/j.combustflame.2025.114401

Wenqiang Du , Shuzhen Niu , Pengfei Yang , Honghui Teng

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引用次数: 0

Abstract

The stability of flow structures is crucial for the combustion efficiency of oblique detonation waves (ODWs). Prior studies have predominantly attributed the destabilization of ODWs to the merging of subsonic regions behind detonation Mach stem. However, the flow structures of ODWs in channels are complex, probably leading to a variety of destabilization mechanisms. This study numerically investigates the ODWs under the influence of viscosity using a detailed chemical reaction model. Results show that the recirculation zone on the lower channel wall plays an important role in the stability of the detonation wave system, which has been ignored in most studies. Specifically, when the secondary reflected shock generated by the lower recirculation zone interacts with the recirculation zone on the upper wall, it triggers the continuous growth of the upper recirculation zone and the formation of an aerodynamic throat. This ultimately leads to flow choking and destabilization of the detonation waves. Based on the above findings, we further evaluate the effectiveness of a moving wedge in regulating the unstable ODWs. It is found that promptly moving the wedge downstream can suppress the upstream movement of the lower recirculation zone, preventing secondary reflected shocks from disrupting the upper recirculation zone. As a result, the unstable detonation wave system is successfully re-stabilized.

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通道流动中再循环区诱发斜爆震的失稳机理

流动结构的稳定性对斜爆震波的燃烧效率至关重要。以往的研究主要将爆轰波的失稳归因于爆轰马赫数后亚音速区域的合并。然而，odw在通道中的流动结构是复杂的，可能导致多种不稳定机制。本文采用详细的化学反应模型，对黏度对odw的影响进行了数值研究。结果表明，下通道壁上的再循环区对爆震波系统的稳定性起着重要的作用，而这在大多数研究中被忽略了。具体来说，当下循环区产生的二次反射激波与上壁面的再循环区相互作用时，触发上循环区不断增长，形成气动喉道。这最终会导致气流堵塞和爆震波的不稳定。在此基础上，我们进一步评估了移动楔块对不稳定odw的调节效果。研究发现，及时将楔块向下游移动可以抑制下循环区的上游运动，防止二次反射冲击破坏上循环区。结果表明，不稳定的爆震波系统得到了成功的再稳定。

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.