湍流和热扩散效应对旋涡火焰间歇边界层闪回的协同作用

IF 6.2 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-09-12 DOI:10.1016/j.combustflame.2025.114458

Shiming Zhang , Zhen Lu , Yue Yang

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引用次数: 0

摘要

采用火焰表面密度法（FSD）模拟了富氢旋涡火焰的间歇边界层闪回（BLF）。本文介绍了6例以混合管周期性火焰进出为特征的间歇BLF。间歇BLF特性随氢体积分数的变化而变化。在低氢富集情况下，小火焰凸起进出混合管。间歇BLF事件持续时间和BLF深度随氢含量的增加而增加。同时，深穿上游的大火焰舌是最富氢的情况。模拟得到的平均峰深和标准差与低、中度富氢情况下的实验数据吻合较好。然而，LES-FSD低估了最高富氢情况下BLF峰的平均深度。流动-火焰相互作用的分析揭示了间歇性BLF现象的两种机制。出口附近火焰凸起的振荡是由再循环区引起的逆流引起的。同时，由于湍流燃烧速度大导致边界层分离，湍流和热扩散效应协同作用导致深度间歇BLF发生。

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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Synergy of turbulence and thermo-diffusive effects on the intermittent boundary-layer flashback of swirling flames

We simulated the intermittent boundary-layer flashback (BLF) of hydrogen-enriched swirling flames using large-eddy simulation (LES) with the flame-surface-density (FSD) method. Six cases of intermittent BLF, characterized by periodic flame entry and exit of the mixing tube, are presented. The intermittent BLF characteristics varied with the hydrogen volume fraction. Small flame bulges entered and exited the mixing tube in low hydrogen-enrichment cases. The duration of intermittent BLF events and BLF depth increased as the hydrogen content increased. Meanwhile, a large flame tongue penetrating deeply upstream characterized the highest hydrogen-enrichment case. The mean BLF peak depths and standard deviations obtained through simulations aligned well with experimental data for low and moderate hydrogen-enrichment cases. However, LES-FSD underestimated the average BLF peak depth for the highest hydrogen-enrichment case. Analysis of the flow-flame interaction revealed two mechanisms underlying the intermittent BLF phenomena. The flame bulges’ oscillation near the outlet is caused by the reverse flow induced by the recirculation zone. At the same time, the deep intermittent BLF occurs due to the boundary layer separation induced by the large turbulent burning velocity, resulting from the synergy of turbulence and thermo-diffusive effects.

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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.