When the mountain tunnel projects passing through the complex formation with coal, it happened along with disaster accidents such as gas outburst, gas combustion, and gas explosion. These disasters should seriously threaten the safety and life of the construction personnel and affect the normal operation of the tunnel construction. Ventilation is the most effective means to control gas, fire, dust, heat, and other disasters. To study the effects of different ventilation modes in highway gas tunnels, Fluent software was used to simulate forced ventilation, exhaust ventilation, and mixed ventilation in a high gas tunnel of a highway in Hunan. The distribution law of the airflow velocity and gas concentration of these three ventilation modes were obtained to determine the optimal ventilation system. It was shown that vortex zones of different ranges formed in the tunnel for all three ventilation modes, and the gas concentration was higher in the vortex zone than in other regions. Mixed ventilation of them is superior to the other two modes, showing the best ventilation effect with regard to airflow velocity and gas concentration.

中文翻译：

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公路瓦斯隧道气体通风方式的数值模拟

当山隧道穿过煤的复杂地层时，会发生瓦斯突出，瓦斯燃烧和瓦斯爆炸等灾害事故。这些灾害将严重威胁施工人员的安全和生命，影响隧道施工的正常运行。通风是控制瓦斯，火，灰尘，热和其他灾害的最有效手段。为了研究不同通风方式对公路瓦斯隧道的影响，使用Fluent软件模拟了湖南某高速公路高瓦斯隧道中的强制通风，排气通风和混合通风。获得了这三种通风方式的气流速度和气体浓度的分布规律，从而确定了最佳的通风系统。结果表明，在三种通风方式下，隧道内都形成了不同范围的涡流区，涡流区的气体浓度高于其他区域。它们的混合通风优于其他两种模式，在气流速度和气体浓度方面显示出最佳的通风效果。