Experimental study on the influence of delayed explosion characteristics of dusty methane

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2025-09-17 DOI:10.1016/j.tsep.2025.104120

Haixia Zhang , Qingcheng Zhang , Tao Cui , Zhuowen Cai , Jingde Xu , Zhie Wang

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Abstract

To systematically investigate the impact of varying concentrations of coal dust on the characteristics of methane explosions under the influence of ignition delay, a 60 L spherical chamber was used to simulate an underground coal chamber environment. The laser schlieren technique was employed to observe the micro-flow field of deflagration, and the flame front was processed using MATLAB, which enabled the analysis of the evolution process of the development morphology of the flame structure. A series of mixed explosion experiments were conducted under conditions of varying coal dust concentrations (0 g/m³, 10 g/m³, 20 g/m³, and 30 g/m³) and ignition delay times (30 ms, 60 ms and 90 ms, respectively). These findings suggest that the introduction of an ignition delay leads to a decrease in the initial peak pressure (P_max) of methane-air explosions, followed by an increase in the maximum pressure rise rate (dP/dt)_max and the explosion severity index (K_st). It is evident that delayed ignition exacerbates flame instability, with turbulence accelerating flame propagation while reducing pressure. The maximum explosion pressure (P_max) was found to decrease by 6.24 %, whilst the maximum pressure rise rate (dP/dt)_max increased by 82.48 %. In conditions of reduced ignition delays, an increase in dust concentration results in a decrease in P_max and an increase in both (dP/dt)_max and K_st. As the ignition delay time and dust concentration increase, the explosion pressure (P_max) increases dramatically at 30 g/m³, with (dP/dt)_max and K_st also increasing. The findings offer a valuable contribution to the field of dusty methane explosion, which provides insights that can be used to prevent and manage coal mine catastrophes.

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含尘甲烷延迟爆炸特性影响的实验研究

为了系统研究不同浓度煤尘对延迟点火条件下甲烷爆炸特性的影响，采用60l球形燃烧室模拟地下煤室环境。采用激光纹影技术观察爆燃微流场，并利用MATLAB对火焰锋面进行处理，分析火焰结构发展形态的演变过程。在不同煤尘浓度（0 g/m3、10 g/m3、20 g/m3和30 g/m3）和点火延迟时间（分别为30 ms、60 ms和90 ms）条件下进行了一系列混合爆炸实验。这些结果表明，点火延迟的引入导致甲烷-空气爆炸的初始峰值压力（Pmax）降低，随后最大压力上升速率（dP/dt）max和爆炸严重指数（Kst）增加。很明显，延迟点火加剧了火焰的不稳定性，湍流加速了火焰的传播，同时降低了压力。最大爆炸压力（Pmax）降低了6.24%，最大压力上升速率（dP/dt）max增加了82.48%。在减少点火延迟的条件下，粉尘浓度的增加导致Pmax的降低和（dP/dt）max和Kst的增加。随着点火延迟时间和粉尘浓度的增加，爆炸压力（Pmax）在30 g/m3时急剧增大，（dP/dt）max和Kst也随之增大。这些发现为灰尘甲烷爆炸领域提供了宝贵的贡献，为预防和管理煤矿灾难提供了见解。

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

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

期刊介绍： Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.