储氢长管拖车隧道燃爆事故演化机理研究

RESEARCH ON ACCIDENT EVOLUTION MECHANISM CAUSED BY HYDROGEN LONG-TUBE TRAILER EXPLOSION IN TUNNEL

  • 摘要: 储氢长管拖车在城市公路隧道运输时突发异常状况将导致氢气泄漏和燃爆事故,本文通过构建储氢长管拖车隧道事故模型,基于隧道内氢气泄漏浓度、冲击波和温度场等特性参数分析,阐明燃爆事故演化规律和毁伤机理。研究表明,泄漏氢气在隧道口呈竖向羽流扩散,而隧道内扩散时会在一定区域积聚。氢气燃爆处驻留车辆和设备构成边界约束条件,将增强爆炸冲击波的传播速度和峰值超压。此外,冲击波与火焰形成耦合效应,进而增强了破坏后果。

     

    Abstract: The emergency situation of hydrogen long-tube trailer occurs in a urban road tunnel is prone to cause hydrogen leakage and explosion accidents. In this study, a numerical model of hydrogen long-tube trailer accident in tunnel is developed based on the real scenario, and the mechanisms of accident evolution and damage effect are then elucidated through the collection and analysis of characteristic parameters (such as dispersion concentration, overpressure and temperature, etc.). The results show that the leaked hydrogen disperses in a vertical plume at the tunnel entrance and accumulates in a certain area when it disperses inside the tunnel, while its dispersion velocity is related to ventilation condition of tunnel. A coupling effect is generated between shock wave and flame induced by such hydrogen long-tube trailer explosion in tunnel, resulting in even larger damage to the tunnel.

     

/

返回文章
返回
Baidu
map