气流特征对水平长管内石松子粉尘爆炸火焰结构的影响

高伟; 阿部俊太郎; 荣建忠; 土桥律

doi:10.11883/1001-1455-(2015)03-0372-08

气流特征对水平长管内石松子粉尘爆炸火焰结构的影响

doi: 10.11883/1001-1455-(2015)03-0372-08

1.
大连理工大学化工机械学院, 辽宁大连 116024
2.
东京大学工学院化学系统工程专攻, 东京 113-8656
3.
公安部四川消防研究所, 四川成都 610036

基金项目: 国家自然科学基金项目(51406023);中国博士后科学基金项目(2014M560213)

详细信息

作者简介:
高伟(1984—), 男, 博士, 讲师, gaowei07@mail.ustc.edu.cn

中图分类号: O383;X932
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出版历程
- 收稿日期: 2013-07-08
- 修回日期: 2014-06-03
- 刊出日期: 2015-05-25

Effect of airflow characteristics on flame structure for following lycopodium dust-air mixtures in a long horizontal tube

1.
School of Chemical Machinery, Dalian University of Technology, Dalian 116024, Liaoning, China
2.
Department of Chemical System Engineering School of Engineering, University of Tokyo, Tokyo 113-8656, Japan
3.
Sichuan Fire Research Institute of Ministry of Public Security, Chengdu 610036, Sichuan, China

摘要

摘要: 为探索气流特征对水平长管内粉尘爆炸火焰结构的影响, 对采用加压送气传输方式形成的石松子粉尘云经静电引燃后其火焰在水平长管内的传播特性进行实验。利用热线风速仪测量不同气流条件下沿管径方向的速度分布和湍流强度分布, 采用高速摄像系统记录了火焰在水平管道内的传播过程。实验观察到, 即使管内石松子粉尘质量分数相同, 仍然会出现2种不同类型的火焰结构:一种类型火焰轮廓规则、清晰, 火焰中心为连续的黄色发光区并由红色边缘火焰包裹; 另一种类型火焰空间离散, 火焰发光区局部存在, 散乱地呈现不规则状态。详细分析不同气流条件对火焰结构的影响。
- 爆炸力学 /
- 粉尘爆炸 /
- 气动传输 /
- 气流特征 /
- 火焰结构 /
- 火焰传播速度
Abstract: Experiments were conducted to investigate the effect of conveying airflow characteristics on flame structure for the electric spark ignition in air flow of lycopodium dust.Hot wire anemometers were used to measure the distributions of velocity and turbulent intensity along the diameter in a 6 cm diameter and 4 m length horizontal acrylic tube of a blow-type pneumatic conveying system.The measured dust-air mixtures flowing velocities ranged between 10 and 30 m/s.A high-speed video camera was utilized to record the flame propagation process and to obtain the direct light emission photographs.Two apparently different types of flames appeared in the flame propagation process under different airflow conditions.Type A flame was characterized by a regular and continuous structure with the yellow light-emitting zone in the center surrounding by the red luminous zone.Type B flame was discrete in the space and the structure of the luminous zone was irregular.Furthermore, the flame propagation velocities, vortex structures, formation conditions and relative burning velocities of the two types flames under different airflow velocities were discussed in detail.
- mechanics of explosion /
- dust explosion /
- pneumatic transportation /
- air flow characteristics /
- flame structure /
- flame propagation velocity

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图 1 实验装置示意图

Figure 1. Experimental apparatus

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图 2 石松子粒子扫描电镜图像

Figure 2. SEM photographs of unburned and burned lycopodium particles

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图 3 石松子粒子粒径分布曲线

Figure 3. Diameter distribution of the lycopodium particles

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图 4 不同初始气流速度下沿管径方向的气流速度分布和湍流强度分布

Figure 4. Distributions of airflow velocities and turbulent intensities along the diameter under different initial velocities

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图 5 不同气流速度下不同时刻的火焰前端、后端位置

Figure 5. Flame front, rear positions with time under different airflow velocities

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图 6 不同气流速度下火焰的不同位置传播速度

Figure 6. Flame propagation velocities of different positions under different airflow velocities

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图 7 2种类型火焰的形态特征

Figure 7. Characteristics of the two types flames

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图 8 A类型火焰的涡旋结构

Figure 8. Flame vortex structure of type A

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图 9 2种类型火焰的相对燃烧速度

Figure 9. Relative propagation velocities of the two types flames

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