| 刘暄亚,陆守香,秦俊.水雾作用下气体爆炸火焰传播的实验研究[J].火灾科学,2003,12(1):11-18. |
| 水雾作用下气体爆炸火焰传播的实验研究 |
| The Experimental Study of the Propagation of Gas Explosion Flame Influenced by Water Sprays |
| 投稿时间：2002-09-20 修订日期：2002-11-10 |
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| DOI：10.3969/j.issn.1004-5309.年.期.顺序 |
| 基金项目:国家自然科学基金资助项目(50074018) |
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| 中文关键词: 水雾 火焰结构 抑制 |
| 英文关键词:water sprays flame structure mitigation |
| 摘要点击次数: 676 |
| 全文下载次数: 761 |
| 中文摘要: |
| 利用自行设计的全程透明的火焰加速管和水喷雾系统,对不同水雾条件下的气体火焰传播现象进行了实验研究。运用光电传感器与数字摄像技术分析了不同浓度的甲烷在不同水雾条件下的火焰传播速度、火焰阵面轨迹以及火焰结构特性,并通过对传播火焰反应区温度的测量,探讨了水雾抑制气体爆炸火焰传播的内在机理及所需的条件。实验结果表明:由于水雾作用于火焰反应区,降低了火焰反应区内的温度和气体燃烧速度,延长火焰阵面的预热区,减缓火焰阵面传热与传质的进行,从而使传播火焰得以抑制。水雾对气体爆炸火焰传播的抑制效果与水雾流量速度、雾区浓度以及火焰到达水雾区的火焰传播速度有关。 |
| 英文摘要: |
| In this paper, propagation of the gas flame under different water sprays conditions and its interaction with water droplets have been investigated. The experiments were conducted in a transparent rectangular flame tube with a set of water sprays devices. The photodiodes and digital video camera were employed to record the flame propagation. The principia and conditions of the gas flame mitigation by water sprays were discussed through the investigation of the flame propagation velocity, flame front behavior of gas flame propagating and flame structure. The results indicate that the temperatures of the combust reaction zone which decline because of the heating absorbed of the water droplets in the flame reaction zone weaken the combusting reaction and prolong the preheating of the flame front and retard the process of mass transferring and heat transferring in the flame front. The mitigation of the gas explosion by water spray is related to the spray discharge velocity, the size of water droplets and the velocity of the flame propagation. |
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