Physiochemical View of Fuel Jet Impingement and Ignition Upon Contact with a Cylindrical Hot Surface

IF 5.8 2区工程技术 Q2 ENERGY & FUELS Combustion and Flame Pub Date : 2024-10-05 DOI:10.1016/j.combustflame.2024.113784

Sayop Kim , Tonghun Lee , Kenneth S. Kim , Chol-Bum M. Kweon , Je Ir Ryu

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Abstract

This study delves into ignition and flame dynamics involving a cylindrical hot surface impact. Previous studies have focused on the flat-wall hot surface interacting with fuel spray, leaving gaps in understanding the effects of cylindrical hot surfaces on fuel-air mixing and ignition. Using high-fidelity large-eddy simulations (LES), this study investigates how fluid elements, upon contacting an electronically activated glow plug structure, exhibit mixing and thermochemical properties. The analysis examines how this type of structure enhances fuel-air mixing and subsequently influences the thermochemistry behavior in conjunction with the fuel-specific combustion behavior. The study includes scenarios with free spray and non-thermal deposit cases to assess their mixing impact, alongside testing five different electric voltage inputs to study the thermally assisted ignition process. Results demonstrate that the cylindrical structure hinders flow, reducing its inertia and increasing flow residence time. Moreover, a significant Coandă effect due to the circular wall structure is identified, potentially serving as a mechanism for enhancing flame-holding. Furthermore, varying the input voltage notably affects ignition timing, revealing a non-monotonic ignition delay pattern with lower voltages. Detailed analysis highlights the critical role of negative temperature coefficient (NTC)-driven low-temperature chemistry (LTC) in the ignition process.

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燃料射流与圆柱形热表面接触时的撞击和点火的物理化学观点

本研究深入探讨了涉及圆柱形热表面撞击的点火和火焰动力学。以往的研究主要集中在平壁热表面与燃料喷射的相互作用上，对圆柱形热表面对燃料-空气混合和点火的影响的理解存在空白。本研究利用高保真大涡流模拟（LES），研究了流体元素在接触电子激活的辉光塞结构时如何表现出混合和热化学性质。分析研究了这种结构如何增强燃料与空气的混合，进而影响热化学行为和特定燃料的燃烧行为。研究包括自由喷雾和非热沉积情况，以评估它们对混合的影响，同时还测试了五种不同的电压输入，以研究热辅助点火过程。结果表明，圆柱形结构会阻碍流动，减少其惯性并增加流动停留时间。此外，圆壁结构还产生了明显的 Coandă 效应，这可能是增强火焰保持力的一种机制。此外，改变输入电压对点火时间有显著影响，揭示了低电压下的非单调点火延迟模式。详细分析强调了负温度系数（NTC）驱动的低温化学（LTC）在点火过程中的关键作用。

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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.