A hydrogen deflagration-jet flame coupled behavior in a ventilated confined space: Effects of ventilation area and leakage duration

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2024-11-09 DOI:10.1016/j.combustflame.2024.113842

Hongsheng Ma , Changjian Wang , Yang Li , Tao Du , Quan Li

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引用次数: 0

Abstract

Non-uniform hydrogen deflagrations were experimentally conducted in a ceiling ventilated chamber considering the effects of ventilation area A_v and leakage duration t_ig. Two new coupled flame behaviors are observed. The first type of coupled flame structure involves the non-growing conical flame bubbles and jet flames, while the second type involves the growing ellipsoid flame bubbles and jet flames. A decrease in A_v or an increase in t_ig promotes the evolution of first type of coupled flame behavior into the second type. The horizontal propagation of deflagration flames can be divided into three typical stages and the horizontal flame front undergoes a gradual decrease in speed and then a slight acceleration. The overpressure transient exhibits a double peak structure in under-ventilated cases. The overpressure peak P₁ is induced by the coupled upward propagation of jet flames and initial flame bubbles. The overpressure peak P₂ is related to the coupled flame behavior involving jet flame combustion and flame bubble expansion. The maximum overpressure and maximum pressure rise rate show a sharp upward trend as the first type of coupled flame structure evolves into the second type.

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通风密闭空间中的氢爆燃-喷射火焰耦合行为：通风面积和泄漏持续时间的影响

考虑到通风面积 Av 和泄漏持续时间 tig 的影响，在天花板通风室内进行了非均匀氢爆燃实验。观察到两种新的耦合火焰行为。第一种耦合火焰结构涉及不生长的锥形火焰气泡和喷射火焰，第二种耦合火焰结构涉及生长的椭圆形火焰气泡和喷射火焰。Av 值的降低或 tig 值的增加会促使第一种耦合火焰行为演变为第二种耦合火焰行为。爆燃火焰的水平传播可分为三个典型阶段，水平火焰前沿的速度逐渐下降，然后略有加速。在通风不足的情况下，过压瞬态呈现双峰结构。过压峰值 P1 是由喷射火焰和初始火焰气泡的耦合向上传播引起的。过压峰 P2 与喷射火焰燃烧和火焰气泡膨胀的耦合火焰行为有关。当第一种耦合火焰结构演变为第二种耦合火焰结构时，最大超压和最大压力上升率呈急剧上升趋势。

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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.