爆炸压力积聚工况下石松子粉尘爆炸火焰传播特性

喻健良; 纪文涛; 闫兴清; 于小哲; 侯玉洁

doi:10.11883/bzycj-2017-0436

爆炸压力积聚工况下石松子粉尘爆炸火焰传播特性

doi: 10.11883/bzycj-2017-0436

大连理工大学化工机械与安全学院, 辽宁大连 116024

基金项目:

国家自然科学基金项目 51574056

国家自然科学基金项目 51604057

详细信息

作者简介:
喻健良(1963-), 男, 博士, 教授, 博士生导师, yujianliang@dlut.edu.cn

中图分类号: O381;X392
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- 文章访问数: 5945
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- 被引次数: 0
出版历程
- 收稿日期: 2017-12-04
- 修回日期: 2018-02-06
- 刊出日期: 2019-02-05

Flame propagation characteristics of lycopodium dust explosion under explosion pressure accumulation conditions

School of Chemical Machinery and Safety Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China

摘要

摘要: 搭建了一套兼具承压和可视性能粉尘爆炸实验平台，在压力积聚工况下实验研究了石松子粉尘爆炸火焰传播特性。实验结果表明：压力积聚工况下的石松子粉尘爆炸火焰呈现空间离散的束状结构，火焰锋面呈齿状。随着粉尘浓度的提升，火焰连续性增强，锋面趋于平滑，亮度增加，并在750 g/m³达到最佳。不同浓度条件下的石松子粉尘爆炸火焰在传播过程中均呈现明显的速度脉动特征，但脉动频率随粉尘浓度的增大而减小。爆炸火焰平均传播速度随粉尘浓度的增大先增大后减小，并在750 g/m³达到最高。不同浓度条件下的石松子粉尘爆炸火焰前期传播速度均高于后期传播速度。
- 压力积聚 /
- 粉尘爆炸 /
- 火焰结构 /
- 火焰传播速度
Abstract: An experimental setup which can withstand high pressure with good visibility was built. Flame propagation characteristics of lycopodium dust explosion were investigated under explosion pressure accumulation conditions. The experimental results showed that a space-dispersed fascicle-like flame structure was formed after the explosion of lycopodium dust under explosion pressure accumulation conditions. The flame front with a serrate structure was observed. However, on further increasing the dust concentration the flame continuity as well as the luminance increased and reached the top at the concentration of 750 g/m³. The velocity fluctuation during the flame propagation process of lycopodium dust explosion at different concentrations was found. But the fluctuation frequency decreased with the increase of dust concentration. The average flame propagation velocity increased and then decreased with the increase of dust concentration and reached the top at the dust concentration of 750 g/m³. The value of flame velocity was higher in the early stage, but lower in the later stage.
- pressure accumulation /
- dust explosion /
- flame structure /
- flame propagation velocity

HTML全文

图 1 实验装置示意图

Figure 1. Schematic diagram of experimental setup

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图 2 石松子粉尘粒径分布

Figure 2. Diameter distribution of lycopodium dust

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图 3 石松子粉尘扫描电镜

Figure 3. Scanning electron microscope of lycopodium dust

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图 4 浓度为250 g/m³的石松子粉尘爆炸火焰结构随时间的变化规律

Figure 4. Flame structure of lycopodium varying with time at dust concentration of 250 g/m³

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图 5 浓度为500 g/m³的石松子粉尘爆炸火焰结构随时间的变化规律

Figure 5. Flame structure of lycopodium varying with time at dust concentration of 500 g/m³

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图 6 750 g/m³浓度下石松子粉尘爆炸火焰结构随时间的变化规律

Figure 6. Flame structure of lycopodium varying with time at dust concentration of 750 g/m³

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图 7 1 000 g/m³浓度下石松子粉尘爆炸火焰结构随时间变化规律

Figure 7. Flame structure of lycopodium varying with time at dust concentration of 1 000 g/m³

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图 8 不同浓度的石松子粉尘爆炸火焰锋面位置随时间的变化

Figure 8. Flame front position of lycopodium dust explosion along with time at different dust concentrations

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图 9 不同浓度的石松子粉尘爆炸火焰传播速度随时间变化

Figure 9. Flame speed of lycopodium dust explosion along with time at different dust concentrations

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