泡沫铜对密闭管道内合成气爆炸特性影响的实验研究

郑凯; 任佳乐; 宋晨; 贾千航; 邢志祥

doi:10.11883/bzycj-2023-0036

泡沫铜对密闭管道内合成气爆炸特性影响的实验研究

doi: 10.11883/bzycj-2023-0036

常州大学安全科学与工程学院，江苏常州 213164

基金项目: 国家自然科学基金（51804054）

详细信息

作者简介:
郑　凯（1989－　），男，博士，副研究员，zk@cczu.edu.cn

通讯作者:
邢志祥（1967－　），男，博士，教授，xingzhixiang@cczu.edu.cn

中图分类号: O382; X932
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- 被引次数: 0
出版历程
- 收稿日期: 2023-02-09
- 修回日期: 2023-04-07
- 网络出版日期: 2023-04-26
- 刊出日期: 2024-01-11

Experimental study on influences of copper foam on explosive characteristics of syngas in a closed pipe

School of Safety Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China

摘要

摘要: 为研究泡沫铜孔隙密度和H₂体积分数对合成气爆炸特性的影响，在封闭的管道中安装了孔隙密度为15、25和40 ppi的泡沫铜，实验分析了当量比为1的合成气-空气在不同H₂体积分数时的火焰结构、尖端速度和超压等参数变化规律。实验结果表明：火焰在泡沫铜上游的行为是受“郁金香”火焰形成过程的影响，泡沫铜对其没有影响。但是孔隙密度和H₂体积分数的改变不仅会影响“郁金香”火焰的形成时间，还会影响变形“郁金香”火焰的形成。泡沫铜将火焰分割促使其从层流向湍流转化，对爆炸火焰传播起到加速作用。泡沫铜会引起管道内超压和火焰尖端速度的极大提升，且孔隙密度越小，H₂体积分数越大，火焰穿过泡沫铜后的最大火焰尖端速度越大，压力上升幅度越大，超压峰值越高。
- 合成气 /
- 泡沫铜 /
- 爆炸火焰 /
- 尖端速度 /
- 超压
Abstract: In order to investigate the effect of the pore density of copper foam and hydrogen volume fractions ($\varphi $) on the in-air-explosive characteristics of premixed syngas, copper foams with pore densities of 15, 25 and 40 ppi were fixed in a closed pipe (100 mm× 100 mm× 1000 mm) 500 mm from the ignition end. Correspondingly, the premixed syngas-air flame propagates in duct without copper foam was compared. The configuration, tip velocity and overpressure, etc. of the flame were observed by igniting the premixed syngas with equivalence ratio of 1 to the air and a wide range of hydrogen volume fractions (from 10% to 90%). Detailed flame evolution process was visualized by a high-speed camera and the overpressure was recorded by pressure transducer. The results indicates that the copper foam has a significant impact on flame propagation and overpressure-time history. Before the flame reaching the copper foam, its configuration and tip velocity, as well as the overpressure, are only determined by the fuel component, but not the foam, during its formation process to a tulip shape. The pore density and $\varphi $ affect not only the formation time of tulip flame, but also the appearance of distorted tulip flame. The copper foam could lead to the segmentation of flame front and transform the flame front from laminar to turbulence, resulting in the flame acceleration. This phenomenon becomes more evident with the decreasing of pore density. The presence of copper foam can increase the flame tip speed and overpressure significantly. For the case with a smaller pore density, both the maximum flame tip speed, growth of overpressure and maximum overpressure of premixed syngas-air increase with the $\varphi $.
- syngas /
- copper foam /
- explosion flame /
- flame tip speed /
- overpressure

HTML全文

图 1 实验系统示意

Figure 1. Schematic of experimental system

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图 2 不同孔隙密度的泡沫铜

Figure 2. Copper foams with different pore densities

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图 3 不添加泡沫铜时的火焰形态

Figure 3. Flame without copper foam

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图 4 $\varphi $=10%下受不同孔隙密度泡沫铜抑制的火焰形态

Figure 4. Flame at $\varphi $=10% and different pore densities

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图 5 $\varphi $=50%下不同孔隙密度时的火焰形态

Figure 5. Flame at $\varphi $=50% and different pore densities

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图 6 $\varphi $=90%下不同孔隙密度时的火焰形态

Figure 6. Flame at $\varphi $=90% and different pore densities

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图 7 火焰尖端速度随火焰前锋位置的变化

Figure 7. Measured flame tip speed as a function of flame tip location

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图 8 不同孔隙密度下的火焰速度参数

Figure 8. Measured flame speed parameters at different ppi

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图 9 超压（p）随时间变化

Figure 9. Measured overpressure (p) changing with time

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图 10 不同条件的时超压（p）与火焰前锋速度（v）的关系

Figure 10. Relationship between overpressure (p) and flame tip speed (v) under different conditions

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图 11 最大超压（p_max）与H₂体积分数（$\varphi $）的关系

Figure 11. Measured maximum overpressure (p_max) changing with volume fracture of H₂ ($\varphi $)

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