不同位置多孔障碍物对预混火焰传播的影响

doi:10.16265/j.cnki.issn 1003-3033.2020.11.017

中国安全科学学报 ›› 2020, Vol. 30 ›› Issue (11): 114-120.doi: 10.16265/j.cnki.issn 1003-3033.2020.11.017

不同位置多孔障碍物对预混火焰传播的影响

程方明¹ 副教授, 常助川¹, 高彤彤², 纪鹏飞³, 罗振敏¹ 教授

1 西安科技大学安全科学与工程学院,陕西西安 710054;
2 中国十七冶集团有限公司陕西分公司,陕西西安 710038;
3 天津市消防救援总队防火监督处,天津 300090

收稿日期:2020-08-21 修回日期:2020-10-12 出版日期:2020-11-28 发布日期:2021-07-15
作者简介:程方明 (1982—),男,辽宁本溪人,博士,副教授. 主要从事气体粉尘爆炸防控等方面的研究。E-mail: chengfm@xust.edu.cn。
基金资助:
国家重点研究和发展计划(2016-YFC-0800100);国家自然科学基金资助(51674193, 51504186)。

Influence of multi-hole obstacles at different locations on premixed flame's propagation

CHENG Fangming¹, CHANG Zhuchuan¹, GAO Tongtong², JI Pengfei³, LUO Zhenmin¹

1 School of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an Shaanxi 710054, China;
2 Shaanxi Branch, China Seventeen Metallurgical Group Co., Ltd., Xi'an Shaanxi 710038, China;
3 Fire Supervision Office, Tianjin Fire Rescue Corps, Tianjin 300090, China

Received:2020-08-21 Revised:2020-10-12 Online:2020-11-28 Published:2021-07-15

摘要/Abstract

摘要： 为进一步明确预混火焰的传播机制,试验研究半封闭管道不同位置处多孔障碍物对可燃气体爆炸火焰传播的影响;利用高速摄像机拍摄火焰传播过程,分析火焰穿过障碍物前后的形状及动力学变化;同时利用边缘算子检测火焰边缘,并计算火焰边缘长度,衡量火焰的褶皱程度。结果表明:火焰在顶端封闭的管道内传播时会出现回流现象。相比无障碍物工况,管内设置的多孔障碍物会诱导火焰锋面褶皱加剧,从而增大火焰边缘长度,缩短火焰在管道内的传播时间。此外,障碍物距点火位置越远,对火焰的影响越显著;与无障碍工况相比,当障碍物在100 mm处,火焰最大传播速度被提高54%,管道内传播时间被缩短76.2%,火焰边缘长度被增大52.7%。

关键词: 多孔障碍物, 预混火焰, 火焰传播速度, 火焰褶皱, 图像边缘检测

Abstract: In order to understand propagation mechanism of premixed flame, influence of multi-hole obstacles at different locations in semi-closed pipes on flame propagation was studied through experiments. Then, propagation process was recorded by high-speed cameras, and shape and dynamic changes of flame before and after passing through obstacles were analyzed. Meanwhile, its edges were detected by using boundary operator, pixels were calculated, and folds were measured. The results show that compared with cases without obstacles, multi-hole obstacles intensifies flame front folds, which therefore increases pixel value of its edge and shortens time to spread in pipes. In addition, it was found that the farther obstacles are away from ignition position, the more significant impact they will have on flame. And compared with cases of zero obstacle, when it is at 100 mm position, maximum transmission speed of flame is increased by 54%, transmission time is reduced by 76.2%, and flame edge pixel increased by 52.7%.

Key words: multi-hole obstacles, premixed flame, flame propagation speed, flame fold, image edge detection

中图分类号:

X932
O383

程方明, 常助川, 高彤彤, 纪鹏飞, 罗振敏. 不同位置多孔障碍物对预混火焰传播的影响[J]. 中国安全科学学报, 2020, 30(11): 114-120.

CHENG Fangming, CHANG Zhuchuan, GAO Tongtong, JI Pengfei, LUO Zhenmin. Influence of multi-hole obstacles at different locations on premixed flame's propagation[J]. China Safety Science Journal, 2020, 30(11): 114-120.

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不同位置多孔障碍物对预混火焰传播的影响

Influence of multi-hole obstacles at different locations on premixed flame's propagation

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