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首页> 外文期刊>Tunnelling and underground space technology >Reduced-scale experimental and numerical study of fire in a hybrid ventilation system in a large underground subway depot with superstructures under fire scenario
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Reduced-scale experimental and numerical study of fire in a hybrid ventilation system in a large underground subway depot with superstructures under fire scenario

机译：火灾情景下大型上层地下地铁车站混合通风系统失火的缩小实验和数值研究

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摘要

To reduce energy consumption and improve the safety and reliability of ventilation systems in underground subway depots, a hybrid ventilation (HV) system composed of natural ventilation, mechanical fans, and flow deflectors was proposed and tested. A reduced-scale (1:50) experiment and a full-scale numerical simulation were conducted, wherein four heat release rates (HRRs; 281 W, 380 W, 531 W, and 866 W) of the fire source and five ventilation velocities (0.7 m/s, 1.0 m/s, 1.4 m/s, 1.9 m/s, and 2.4 m/s) were tested. The temperature distributions under the ceiling were measured. Smoke movement and smoke layer stability were visualized using a laser sheet. The smoke layer height, gas flux of shafts, and smoke movement route were recorded from the simulation. Under HV, the ceiling temperature decreased significantly with increasing ventilation velocity; however, changes in temperature were different at different locations. With appropriate ventilation velocity (1.4 m/s), HV effectively controlled the smoke temperature of the bottom layer and ensured the stability of the smoke layer in the interlayer. However, the stability of the smoke layer was disrupted at higher ventilation velocities, which caused the smoke to sink, whereas a lower velocity could not slow the rise in temperature. The relationship among ventilation velocity, HRR, ceiling temperature, and smoke layer stability was analysed. A new criterion, N (N = 0.62), was proposed to determine the critical ventilation velocity associated with a lower ceiling temperature and improved smoke layer stability.
机译：为了减少能耗并提高地下地铁站通风系统的安全性和可靠性，提出并测试了由自然通风，机械风扇和导流板组成的混合通风（HV）系统。进行了缩小比例（1:50）实验和全面数值模拟，其中火源的四个热释放速率（HRR； 281 W，380 W，531 W和866 W）和五个通风速度（测试了0.7 m / s，1.0 m / s，1.4 m / s，1.9 m / s和2.4 m / s。测量了天花板下的温度分布。使用激光片观察烟雾运动和烟雾层稳定性。从模拟中记录了烟层的高度，竖井的气体通量和烟的移动路线。在高压下，天花板温度随着通风速度的增加而显着下降；但是，不同位置的温度变化是不同的。 HV以适当的通风速度（1.4 m / s）有效控制底层的烟气温度，并确保中间层烟气层的稳定性。然而，较高的通风速度会破坏烟雾层的稳定性，从而导致烟雾下沉，而较低的速度并不能减缓温度的升高。分析了通风速度，HRR，天花板温度和烟层稳定性之间的关系。提出了一个新的标准N（N = 0.62），以确定与较低的天花板温度和改善的烟层稳定性相关的临界通风速度。

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  • 来源
    《Tunnelling and underground space technology》 |2019年第6期|98-112|共15页
  • 作者

    Wang Zhilei; Zhu Li; Guo Xinxin; Pan Xuhai; Zhou Bin; Yang Juan; Jiang Juncheng; Hua Min; Feng Lu;

  • 作者单位

    Nanjing Tech Univ, Coll Safety Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Safety Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Safety Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Safety Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China|Nanjing Tech Univ, Inst Fire Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China|Nanjing Tech Univ, Jiangsu Key Lab Urban & Ind Safety, Nanjing 210009, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Urban Construct, Nanjing 210009, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Safety Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Safety Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China|Nanjing Tech Univ, Inst Fire Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China|Nanjing Tech Univ, Jiangsu Key Lab Urban & Ind Safety, Nanjing 210009, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Safety Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China|Nanjing Tech Univ, Jiangsu Key Lab Urban & Ind Safety, Nanjing 210009, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Coll Urban Construct, Nanjing 210009, Jiangsu, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Underground large space; Superstructure; Hybrid ventilation; Scaling model; Smoke control;

    机译：地下大空间;上部结构;混合通风;比例模型;烟雾控制;

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