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| 不同通风条件对综合管廊电缆舱火灾火蔓延行为的影响研究 |
| Study on the influence of different ventilation conditions on fire spread behavior in cable compartment of utility tunnel |
| 投稿时间：2024-12-19 修订日期：2025-09-17 |
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| 基金项目:国家自然科学基金项目(52208115)、山东省青年科技人才托举工程(SDAST2024QTA077)、山东省高等学校青创科技支持计划(2023KJ122)、济南市科研带头人工作室项目(202333050) |
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| 中文关键词: 综合管廊 电缆舱 纵向通风 火蔓延 |
| 英文关键词:Utility tunnel Cable compartment Longitudinal ventilation Fire spreading |
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| 中文摘要: |
| 本文采用数值模拟研究了不同通风条件（本文指封闭条件、风口自然开敞和机械纵向通风）对综合管廊电缆舱火灾火蔓延行为的影响，重点分析了热释放速率、火蔓延速度、温度分布以及O2等气体浓度的变化规律。研究结果表明，风口自然开敞时火势向管廊两端呈对称式蔓延，热释放速率有逐渐增大的趋势，而封闭条件会导致火灾熄灭；纵向通风会促进火势向火源下游蔓延，中风速时的热释放速率呈波纹式变化；大风速时，热释放速率会迅速升高。风口自然开敞时，火蔓延速度约为0.0012 m/s，与NIST试验项目得到的结果相近；纵向通风会促进电缆燃烧，火蔓延速度增大，大风速条件时火蔓延速度可达自然开敞的14倍。自然开敞时顶棚温度大体呈对称式分布，随着通风速度的增大，最高温度的位置逐渐向下游偏移，且封闭条件的最高温度要比自然开敞的高。不同通风条件下，O2浓度的变化规律与热释放速率基本一致，但与CO浓度变化趋势相反。本研究可为综合管廊火灾的消防设计和火灾救援提供相关参考。 |
| 英文摘要: |
| FDS numerical simulation software was used to study the effects of different ventilation conditions (this paper refers to the closed conditions, natural ventilation and mechanical longitudinal ventilation) on the fire spread behavior of cable compartment fire in utility tunnel. The heat release rate, fire spreading speed, temperature distribution and the changes of O2 gas concentration were analyzed. The results show that the fire spreads symmetrically to both ends of the pipe gallery during natural ventilation, and the heat release rate tends to increase gradually. When the wind outlet is completely closed, the extinction phenomenon occurs; longitudinal ventilation will promote the fire to spread mainly to the downstream of the fire source, and the heat release rate at medium wind speed shows a sinusoidal fluctuation. When the wind speed is high, the heat release rate will increase rapidly. Under natural ventilation, the fire spread speed is about 0.0012 m/s, which is similar to the results obtained by the NIST test project. Longitudinal ventilation will promote cable combustion, and the flame spread rate increases. The flame spread rate can reach 14 times that of natural opening under high wind speed conditions. The ceiling temperature is generally symmetrically distributed during natural ventilation. With the increase of ventilation speed, the position of the highest temperature gradually shifts downstream, and the highest temperature under closed conditions is higher than that under natural open conditions. Under different ventilation conditions, the O2 concentration is basically consistent with the heat release rate, but it is opposite to the change trend of CO concentration. These results can provide a reference for fire prevention and control in utility tunnel. |
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