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Numerical Simulation for Mine Oblique Lane Fire Based on PDF Non-Premixed Combustion

机译：基于PDF非预混燃烧的矿井斜巷火灾数值模拟

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摘要

In the mine fire period, the smoke plume temperature, critical air velocity, back-flow layer and other fire parameters in the lanes are subjected to environmental factors such as lane dip angle and airflow conditions, coupled with uncertain evolution process. In view of this, a numerical simulation is performed for exploring the dynamic evolution law of fire possibly occurred in the mine. The ANSYS Fluent PDF non-premixed combustion model is applied to reveal the fire development in the lanes with different dip angles under different air velocity. The temperature distribution in the lanes and the evolution law of the fire back-flow layer are also analyzed. Here introduces the dimensionless number-Richardson number (Ri value) to determine the critical value of the development of the fire back-flow layer. The results show that there is a regular relationship of the spatiotemporal evolution properties of fire in the inclined lane with the two factors: dip angle, airflow velocity, According to this law, the calculation model of smoke back-flow layer length with respect to air velocity and inclination angle is established, and the critical air velocity prediction model under the condition of large inclination angle is revised. Based on the critical air velocity and critical angle, the critical value of the Richardson number is determined to be 91.6. When Ri is greater than 91.6, the fire back-flow layer appears, otherwise, it disappears. The findings provide certain clues to identifying the fire in the underground tunnel and predicting the fire development and smoke spread.
机译：在矿山火灾时期，烟雾羽毛温度，临界空气速度，后流动层和其他火灾参数在泳道倾角和气流条件下进行环境因素，加上不确定的进化过程。鉴于此，执行数值模拟，以探索可能发生在矿井中的动态演化法。 ANSYS流畅的PDF非预混燃烧模型用于在不同的空气速度下揭示具有不同倾角的泳道中的火灾开发。还分析了车道中的温度分布和火回流层的演化定律。这里介绍了无量纲数字 - 理查森编号（RI值）来确定火灾回流层的开发的临界值。结果表明，倾斜车道中火灾的时空演化特性存在常规关系：倾角，气流速度，根据本法，烟雾回流层长度相对于空气的计算模型建立速度和倾斜角度，并修订了大倾角条件下的临界空气速度预测模型。基于临界空气速度和临界角度，Richardson号的临界值确定为91.6。当RI大于91.6时，出现火灾回流层，否则，它会消失。该研究结果提供了识别地下隧道中的火灾并预测火灾发育和烟雾传播的某些线索。

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  • 来源
    《Combustion Science and Technology》 |2021年第4期|90-109|共20页
  • 作者

    Wen Hu; Liu Yin; Jin Yongfei; Zhang Duo; Guo Jun; Li Ruikang; Zheng Xuezhao;

  • 作者单位

    Xian Univ Sci & Technol Coll Safety Sci & Engn Xian 710054 Shaanxi Peoples R China|Minist Educ China Key Lab Western Mine & Hazard Prevent Xian Shaanxi Peoples R China|State Mine Emergency Rescue Xian Res Ctr Xian Shaanxi Peoples R China|Key Lab Prevent & Control Coal Fires Shaanxi Prov Xian Shaanxi Peoples R China;

    Xian Univ Sci & Technol Coll Safety Sci & Engn Xian 710054 Shaanxi Peoples R China|Minist Educ China Key Lab Western Mine & Hazard Prevent Xian Shaanxi Peoples R China|State Mine Emergency Rescue Xian Res Ctr Xian Shaanxi Peoples R China|Key Lab Prevent & Control Coal Fires Shaanxi Prov Xian Shaanxi Peoples R China;

    Xian Univ Sci & Technol Coll Safety Sci & Engn Xian 710054 Shaanxi Peoples R China|Minist Educ China Key Lab Western Mine & Hazard Prevent Xian Shaanxi Peoples R China|State Mine Emergency Rescue Xian Res Ctr Xian Shaanxi Peoples R China|Key Lab Prevent & Control Coal Fires Shaanxi Prov Xian Shaanxi Peoples R China;

    Xian Univ Sci & Technol Coll Safety Sci & Engn Xian 710054 Shaanxi Peoples R China|Minist Educ China Key Lab Western Mine & Hazard Prevent Xian Shaanxi Peoples R China|State Mine Emergency Rescue Xian Res Ctr Xian Shaanxi Peoples R China|Key Lab Prevent & Control Coal Fires Shaanxi Prov Xian Shaanxi Peoples R China;

    Xian Univ Sci & Technol Coll Safety Sci & Engn Xian 710054 Shaanxi Peoples R China|Minist Educ China Key Lab Western Mine & Hazard Prevent Xian Shaanxi Peoples R China|State Mine Emergency Rescue Xian Res Ctr Xian Shaanxi Peoples R China|Key Lab Prevent & Control Coal Fires Shaanxi Prov Xian Shaanxi Peoples R China;

    Xian Univ Sci & Technol Coll Safety Sci & Engn Xian 710054 Shaanxi Peoples R China;

    Xian Univ Sci & Technol Coll Safety Sci & Engn Xian 710054 Shaanxi Peoples R China|Minist Educ China Key Lab Western Mine & Hazard Prevent Xian Shaanxi Peoples R China|State Mine Emergency Rescue Xian Res Ctr Xian Shaanxi Peoples R China|Key Lab Prevent & Control Coal Fires Shaanxi Prov Xian Shaanxi Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Tunnel fire; characteristic parameter; critical air velocity; back-flow layer; Richardson number;

    机译：隧道火灾;特征参数;临界空气速度;回流层;Richardson号码;
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