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首页> 外文期刊>Combustion Science and Technology >NUMERICAL SIMULATION ON THE INFLUENCES OF INITIAL TEMPERATURE AND INITIAL PRESSURE ON ATTENUATION CHARACTERISTICS AND SAFETY DISTANCE OF GAS EXPLOSION
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NUMERICAL SIMULATION ON THE INFLUENCES OF INITIAL TEMPERATURE AND INITIAL PRESSURE ON ATTENUATION CHARACTERISTICS AND SAFETY DISTANCE OF GAS EXPLOSION

机译：初始温度和初始压力对气体爆炸衰减特性和安全距离影响的数值模拟

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摘要

Understanding a safety distance necessary to avoid the harms of a shock wave to underground personnel may have great significance to the safety of underground personnel, disaster relief efforts, and the treatment of the gas explosion in coal mines. Through a roadway model with a cross-section area of 80 x 80 mm2 and a length of 100 m, the explosive attenuation characteristics of a methanelair mixture with a fuel concentration of 9.5% and a filling ratio of 10% were simulated hy using AutoReaGas software far various initial temperatures (248-328 K) and initial pressures (20-200 KPa). The results show that the safety distance increases with the increase of the initial temperature and follows the changing trend of decreasing, increasing, and decreasing again with the increase of the initial pressure. The time of flame arrival to each point away from initiation and the maximum distance of flame propagation both increase with the increase of the initial temperature, hut they are almost the same for various initial pressures. Before the attenuation of the shock wave occurs, increasing the initial temperature increases the maximum temperature, but decreases the peak overpressure, the maximum density, the maximum combustion rate, and the maximum gas velocity. However, increasing the initial pressure increases the peak overpressure, the maximum density, and the maximum combustion rate. The influences of the initial temperature and the initial pressure on these parameters at the longer distance points from the ignition source are greater than those at the shorter distance points.
机译：了解避免冲击波对地下人员造成伤害所必需的安全距离可能对地下人员的安全，救灾工作以及煤矿瓦斯爆炸的处理具有重要意义。通过截面积为80 x 80 mm2，长度为100 m的道路模型，使用AutoReaGas软件模拟了燃料浓度为9.5％，填充率为10％的甲烷混合气的爆炸衰减特性。各种初始温度（248-328 K）和初始压力（20-200 KPa）。结果表明，安全距离随着初始温度的升高而增大，并且随着初始压力的升高而遵循减小，增大，再次减小的变化趋势。火焰到达远离引发的每个点的时间和火焰传播的最大距离都随初始温度的升高而增加，但对于各种初始压力，它们几乎是相同的。在冲击波衰减发生之前，增加初始温度会增加最高温度，但会降低峰值过压，最大密度，最大燃烧速率和最大气体速度。但是，增加初始压力会增加峰值过压，最大密度和最大燃烧速率。初始温度和初始压力对距点火源的较长距离点处的这些参数的影响大于在较短距离点处的影响。

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  • 来源
    《Combustion Science and Technology》 |2012年第3期|p.135-150|共16页
  • 作者

    Bing-you Jiang; Bai-quan Lin; Shu-lei Shi; Chuan-jie Zhu; Jun Ning;

  • 作者单位

    Faculty of Safety Engineering, China University of Mining & Technology, Xuzhou, China,State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou, China;

    School of Management, Xuzhou Normal University, Xuzhou, China,State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou, China;

    School of Management, Xuzhou Normal University, Xuzhou, China;

    Faculty of Safety Engineering, China University of Mining & Technology, Xuzhou, China,State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou, China;

    Faculty of Safety Engineering, China University of Mining & Technology, Xuzhou, China,State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    gas explosion; initial pressure; initial temperature; safety distance; shock wave;

    机译：瓦斯爆炸;初始压力初始温度安全距离激波;

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