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基于甲烷爆炸防护机理的柔性防护装置的尺寸研究

Dimensional study of flexible protection device based on methane explosion protection mechanism.

作者信息

Zhang Qinghua, Duan Yulong, Duan Xianqi, Lang Rui, Long Jun

机构信息

Anhui university of science and technology, Huainan, 232001, China.

CCTEG Chongqing Research Institute, Chongqing, 400037, China.

出版信息

Sci Rep. 2025 Mar 27;15(1):10570. doi: 10.1038/s41598-025-95341-y.

DOI:10.1038/s41598-025-95341-y
PMID:40148505
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11950189/
Abstract

Flexible materials deform during flame propagation, altering their blockage ratio and the force exerted on the fluid due to various influencing factors. This affects gas explosion characteristics, changes the flame structure, and reduces explosion overpressure and flame speed. To determine the impact of flexible protective devices on the protection mechanism against gas explosions, this experiment used flexible obstacles (polyurethane sponge) as the protective apparatus. Employing a self-built explosion experiment platform, the research investigated methane explosion flame evolution, flame propagation speed, and explosion overpressure under various sizes of pre-positioned flexible obstacles. The study focused on observing the morphological evolution of methane explosion flames, the speed of flame spread, and the explosion overpressure in scenarios with pre-positioned obstacles of different sizes. The results showed that inserting flexible obstacles effectively reduced explosion overpressure and flame front propagation speed. Based on the working conditions set up in this experiment, the maximum rate of decrease in explosion overpressure exceeds 50% and the maximum rate of decrease in flame front velocity is around 20%. With pre-positioned flexible obstacles, as the blockage ratio of the flexible obstacle increased, the severity of deflagration also increased, with both explosion overpressure and flame front speed rising with the blockage ratio. Explosion overpressure and flame front speed also increased with the thickness of the flexible obstacle; simultaneously, the flame front position advanced with the thickness of the flexible obstacle. When constructing close-range protection devices, the height of the protection device should be lower than the protected object (H < h), and the thickness of the protection device should not be too thick.

摘要

柔性材料在火焰传播过程中会发生变形，由于各种影响因素，其阻塞比和施加在流体上的力会发生改变。这会影响瓦斯爆炸特性，改变火焰结构，并降低爆炸超压和火焰速度。为了确定柔性防护装置对瓦斯爆炸防护机制的影响，本实验采用柔性障碍物（聚氨酯海绵）作为防护装置。利用自建的爆炸实验平台，研究了不同尺寸预先设置的柔性障碍物下甲烷爆炸火焰的演变、火焰传播速度和爆炸超压。该研究重点观察了不同尺寸预先设置障碍物情况下甲烷爆炸火焰的形态演变、火焰传播速度和爆炸超压。结果表明，插入柔性障碍物有效地降低了爆炸超压和火焰前沿传播速度。基于本实验设定的工况，爆炸超压的最大降低率超过50%，火焰前沿速度的最大降低率约为20%。对于预先设置的柔性障碍物，随着柔性障碍物阻塞比的增加，爆燃的严重程度也增加，爆炸超压和火焰前沿速度均随阻塞比的增加而上升。爆炸超压和火焰前沿速度也随柔性障碍物厚度的增加而增加；同时，火焰前沿位置随柔性障碍物厚度的增加而前移。在构建近距离防护装置时，防护装置的高度应低于被保护对象（H < h），且防护装置的厚度不应过厚。

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