《火灾科学（中英文）》编辑部

姜学鹏,吕彦昕,李超,万娟.侧部点式排烟模式下烟气分层特性研究[J].火灾科学,2021,30(3):151-159.

侧部点式排烟模式下烟气分层特性研究

Study on the characteristics of flue gas stratification under the side point smoke exhaust mode

DOI：10.3969/j.issn.1004-5309.2021.03.04

基金项目:国家自然科学基金(51874213,51806156); 湖北省自然科学基金青年项目(2018CFB186,2018CFB226)

作者	单位
姜学鹏	武汉科技大学资源与环境工程学院,武汉,430081 武汉科技大学消防安全技术研究所,武汉,430081 武汉科技大学湖北省工业安全工程技术研究中心,武汉,430081
吕彦昕	武汉科技大学资源与环境工程学院,武汉,430081 武汉科技大学消防安全技术研究所,武汉,430081
李超	武汉科技大学资源与环境工程学院,武汉,430081 武汉科技大学消防安全技术研究所,武汉,430081
万娟	武汉科技大学资源与环境工程学院,武汉,430081 武汉科技大学消防安全技术研究所,武汉,430081

中文关键词: 侧部点式排烟烟气分层烟气掺混影响长度烟气层厚度数值模拟

英文关键词:Side point smoke exhaust Smoke stratification Influence length of flue gas blending Smoke layer thickness Numerical simulation

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全文下载次数: 2028

中文摘要:

引入烟气掺混影响长度的概念,针对侧部点式排烟模式下不同火灾热释放速率、排烟流量等变化条件,对烟气层厚度、烟气层温度及水平流动速度随烟气水平蔓延的变化情况进行了数值模拟研究。结果表明:烟气掺混影响长度与排烟流量成正比例增长关系;排烟流量较小时,烟气存在明显分层,随着排烟流量的增大,烟气层与冷空气层剧烈掺混,烟气层变得紊乱,看不到明显的分层现象;同一纵向条件下排烟口附近上层烟气层的流速值随排烟流量增加呈现先增大后减小的趋势,不同纵向条件下排烟口外侧烟层流速较低,距离排烟口越远时,侧向排烟对烟气蔓延的抑制作用越弱;排烟流量对于烟气层稳定性的抑制作用主要集中在排烟口处及排烟口与隧道端部区段。

英文摘要:

In this paper, numerical simulation is conducted to examine the thickness of the flue gas layer, the temperature of the flue gas layer, and the horizontal flow rate, by introducing the concept of flue gas mixing influence length. Different heat release rates and flue gas flow rates in the side point type smoke exhaust mode are considered. The results show that the length of the flue gas mixing influence is proportional to the smoke flow rate. When the smoke flow rate is low, the flue gas shows apparent stratification. With the increase of the smoke flow rate, the smoke layer and the cold air layer are mixed violently. The smoke layer becomes turbulent with no evident stratification. Under the same vertical conditions, the flow velocity of the upper smoke layer near the exhaust port shows a trend of first increasing and then decreasing with the exhaust flow increase. The flow velocity of the smoke layer outside the lower exhaust port is lower, and the farther away from the exhaust port, the inhibitory effect of lateral exhaust smoke on the spread of smoke is weaker. The suppression effect of the exhaust flow on the stability of the smoke layer is mainly concentrated in the exhaust at the mouth and between the exhaust vent and the end of the tunnel.

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