Influence of blockage ratio and length-to-diameter ratio on explosion dynamics of DME/H2 blended gas in semi-open space

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy Pub Date : 2025-04-22 DOI:10.1016/j.energy.2025.136258

Yu Ma , Tao Fan , Yijun Li , Qi Zhang , Qian Zhao , Yuchun Zhang

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引用次数: 0

Abstract

This study systematically investigates the influence of obstacle blockage ratio (BR = 0–0.75) and pipeline length-to-diameter (L/D = 45–90) ratio on explosion dynamics in dimethyl ether/hydrogen (DME/H₂) blended gas. The results indicate that increasing BR enhances flame turbulence, which intensifies combustion reactions and accelerates flame propagation. Consequently, there is a significant rise in the maximum explosion overpressure (P_max) and a reduction in the time to reach P_max. Specifically, P_max increases the most at BR = 0.55 with 204 % and the time to reach P_max shortens the most at BR = 0.35 with 13.3 % compared to unobstructed condition. However, at the higher blockage ratio of BR = 0.75, the throttling effect becomes dominant, resulting in a decrease in P_max and an extended time to reach P_max. Additionally, increasing the L/D ratio enhances the turbulence effect generated during the flame propagation, resulting in the formation of more small-scale vortex structures at the flame front. This promotes the mixing of unburned gas with the flame front, thereby increasing the combustion rate and peak overpressure, while shortening the time to reach P_max by 7.95–41.4 %. Notably, neither BR nor L/D ratio significantly affected peak flame temperatures.

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堵塞比和长径比对半开放空间二甲醚/氢气混合气体爆炸动力学的影响

系统研究了障碍物堵塞比（BR = 0 ~ 0.75）和管道长径比（L/D = 45 ~ 90）对二甲醚/氢（DME/H2）混合气体爆炸动力学的影响。结果表明，BR的增加增强了火焰湍流，从而加剧了燃烧反应，加速了火焰的传播。因此，最大爆炸超压（Pmax）显著上升，达到Pmax的时间缩短。其中，在BR = 0.55时，达到Pmax的时间增加最多，为204%；在BR = 0.35时，达到Pmax的时间缩短最多，为13.3%。然而，在BR = 0.75的较高堵塞比下，节流作用占主导地位，导致Pmax降低，达到Pmax的时间延长。此外，L/D比的增大增强了火焰传播过程中产生的湍流效应，导致火焰前缘形成更多的小尺度涡结构。这促进了未燃烧气体与火焰前缘的混合，从而提高了燃烧速度和峰值超压，同时使达到Pmax的时间缩短了7.95 ~ 41.4%。值得注意的是，BR和L/D比对火焰峰值温度没有显著影响。

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来源期刊

Energy 工程技术-能源与燃料

CiteScore

15.30

自引率

14.40%

发文量

审稿时长

14.2 weeks

期刊介绍： Energy is a multidisciplinary, international journal that publishes research and analysis in the field of energy engineering. Our aim is to become a leading peer-reviewed platform and a trusted source of information for energy-related topics. The journal covers a range of areas including mechanical engineering, thermal sciences, and energy analysis. We are particularly interested in research on energy modelling, prediction, integrated energy systems, planning, and management. Additionally, we welcome papers on energy conservation, efficiency, biomass and bioenergy, renewable energy, electricity supply and demand, energy storage, buildings, and economic and policy issues. These topics should align with our broader multidisciplinary focus.