摘要
氢燃料电池动力系统应用于轨道车辆,替代传统内燃机或弓网受流系统,能显著降低建设投资,并具有高效率、无污染、零碳排放、低噪音等优势。然而由于氢气(H_(2))易燃易爆,一旦泄漏,会威胁到人或财产安全,特别在狭小封闭或半封闭空间,空间受限不利于H_(2)扩散会加剧H_(2)聚集,因此氢燃料电池机车的广泛推广需要深入分析其安全性。对不同泄漏位置情况下的H_(2)在隧道内泄漏扩散特性进行数值模拟,研究不同泄漏工况下H_(2)浓度分布随时变规律,结果显示:在泄漏初始阶段,上部泄漏时受实际气流组织和自身浮力的影响,泄漏后H_(2)沿隧道顶部向下游方向进行扩散,可燃气体云的轮廓变大,危险区域存在于隧道顶部;下部泄漏时,气体沿列车底部扩散,危险区域存在于隧道底部。研究结果对促进氢燃料电池机车应用推广具有参考意义。
The hydrogen fuel cell power system is used in rail vehicles to replace traditional internal combustion engines or pantograph-net current collecting systems, which can significantly reduce construction investment, and has the advantages of high efficiency, no pollution, zero carbon emissions and low noise.However, as hydrogen(H_(2)) is a flammable and explosive substance and an accidental release may have catastrophic consequences, especially in the narrow or semi closed spaces where H_(2)is liable to accumulate.Having a comprehensive understanding of hydrogen fuel cell is essential before the extensive promotion. In this paper, a computational fluid dynamics(CFD) model for the prediction of dispersion of H_(2)in a tunnel is proposed and simulations of H_(2)release in different positions are carried out.The results show that H_(2)release positions affect the dispersion characteristic remarkably.When release from the top of the locomotive, H_(2)dispersion pattern is influenced by the actual air distribution and its own buoyancy. H_(2)disperses along the top of the tunnel to the downstream direction, the region of combustible gas cloud becomes larger, and the dangerous region exists at the top of the tunnel. Whereas when release from bottom of the locomotive, H_(2)tends to disperse along the bottom of the train, and the dangerous region exists at the bottom of the tunnel. This study may help to promote the application of hydrogen fuel cell locomotive.
作者
薛龙昌
默帆
宋立业
邓佳佳
刘斌
XUE Longchang;MO Fan;SONG Liye;DENG Jiajia;LIU Bin(CRRC Industrial Institute Corporation Limited,Beijing 100160;不详)
出处
《工业安全与环保》
2022年第3期28-32,共5页
Industrial Safety and Environmental Protection
基金
河北省自然科学基金(E2019210036)。
关键词
氢气
隧道
氢燃料电池
有轨电车
计算流体动力学
hydrogen
tunnel
hydrogen fuel cell
cell trams
computational fluid dynamics
