The transition from CJ-deflagration to detonation in a square channel

IF 6.2 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-08-15 DOI:10.1016/j.combustflame.2025.114407

Maddy Moran, Gaby Ciccarelli

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引用次数: 0

Abstract

Experiments were performed in a 7.6 cm square channel to study the transition of a Chapman-Jouguet (CJ) deflagration to detonation in stoichiometric propane-oxygen, hydrogen-oxygen, and acetylene-oxygen with and without argon dilution. The subcritical transmission of a CJ detonation wave through a perforated plate produced a CJ deflagration. High-speed side-view schlieren, end view chemiluminescence visualization, and soot foils were used to identify the location and nature of the deflagration-to-detonation transition (DDT) process. Detonation initiation was categorized as prompt or delayed depending on the effect of the compressible-turbulent flow immediately downstream of the perforated plate. For prompt initiation the transverse waves generated by the decoupled detonation were directly responsible for detonation initiation. The mixture detonation cell structure irregularity played no role in prompt initiation but played a significant role for delayed initiation. For undiluted propane-oxygen progressive strengthening of the transverse waves ultimately led to detonation initiation at the channel walls because of lateral transverse wave collisions. For the argon diluted mixtures that have regular detonation cell structures, detonation initiation typically occurred in the corners, most likely due to flame boundary layer interaction due to the absence of transverse wave collisions at the DDT location. The mechanism for transverse wave amplification was not present for the regular cell structure mixture.

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从j -爆燃到方形通道内爆轰的过渡

实验在7.6 cm平方的通道中进行，研究了在化学计量丙烷-氧、氢-氧和乙炔-氧稀释和不稀释的情况下，Chapman-Jouguet （CJ）爆燃到爆轰的转变。CJ爆震波通过穿孔板的亚临界传输产生CJ爆燃。利用高速侧视纹影、端视化学发光可视化和烟灰箔来识别爆燃-爆轰过渡（DDT）过程的位置和性质。根据穿孔板下游可压缩湍流的影响，将爆轰起爆分为迅速起爆和延迟起爆。对于快速起爆，解耦爆轰产生的横波直接起爆。混合爆轰室结构的不规则性对爆轰迅速起爆没有影响，但对延迟起爆起着重要作用。对于未稀释的丙烷-氧，横向横波的逐渐增强最终导致通道壁上的爆轰起爆。对于具有规则爆轰室结构的氩稀释混合物，爆轰起爆通常发生在角落，很可能是由于在DDT位置没有横波碰撞而引起的火焰边界层相互作用。对于规则的细胞结构混合物，不存在横波放大机制。

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.