具有横通道的双洞公路隧道火灾数值模拟研究

隧道内发生火灾时空气流动状况非常复杂,是一种带有剧烈放热化学反应的流动现象,它包含着流动、传热、传质和化学反应以及它们之间的相互作用,实际燃烧过程是三维非稳态湍流过程.文章采用三维数值模拟方法,用连续方程、动量方程、能量方程及气体组分方程描述其气流流动状态,并采用湍流粘性系数模型中应用最广泛和最成功的受浮力影响的湍流模型方程.通过对某实际隧道的不同火灾工况进行模拟计算,以及速度场、温度场的分析,从中可以较全面地了解隧道火灾特性和烟气发展规律,从而提出控制火灾烟气的优化通风方案,为确定人员逃生方式及时间提供理论依据.

Numerical Simulation of Fire in Double Tube Road Tunnel with Transverse Alleyways

When the tunnel is on fire,the air flow state is very complex,which is a flow phenomenon with intense exothermic chemical reactions and includes fluxion,heat transfer,mass transfer,chemical reaction and interactions between them.The actual combustion process is a three-dimensional unsteady turbulent process.In this paper based on the three-dimensional numerical simulation method,the continuity equations,momentum equations,energy equations and species equations are used to describe the air flow state.The most widely used and most successful turbulence modal equation affected by the buoyancy among the turbulence viscosity models is adopted in this paper.By simulating different fire conditions in an actual tunnel and analyzing the velocity and temperature field,the tunnel fire characteristics and smoke development laws can be understand comprehensively.So,the optimum ventilation plan to control fire smoke is raised and the theoretical basis is provided to determine the time and means to escape.