引水工程深埋长隧洞施工中通风特性数值模拟

Numerical simulation of ventilation characteristics in deep-buried long diversion tunnel

为了解决传统方法不能准确模拟隧洞中风流方向和温度分布的问题,本文提出一种引水工程深埋长隧洞施工中通风特性数值模拟方法。根据引水工程深埋长隧洞施工的工况建立三维模型,通过GAMBIT软件对基于该模型的隧道划分网格结构,分析该网格结构下的通风特点及方式;采用三维紊态RNG k-ε湍流模型对引水工程深埋长隧洞施工中的通风特性进行分析,对不同工况下的引水工程深埋长隧洞的通风情况进行数值模拟,得到最终通风特性数值方程,实现数值模拟。实验结果表明:该方法可以准确模拟隧洞中风流的方向和温度分布,其划分精度随网格数量大幅度增加,平均划分精度高达85%。能够为构建引水工程深埋长隧洞施工管理提供依据。

The traditional method cannot accurately simulate the direction of wind flow and temperature distribution in a tunnel;thus,a numerical method for simulating ventilation characteristics in the construction of a deep-buried long water-diversion tunnel is proposed in this paper.According to the condition of its construction,a three-dimensional model was established.The tunnel mesh structure based on the model was divided by the software GAMBIT,and the ventilation characteristics and modes under the mesh structures were analyzed.The ventilation characteristics of the deep-buried long water-diversion tunnel were analyzed using the three-dimensional turbulent RNG k-εturbulence model.Additionally,these characteristics under different working conditions were analyzed.Thus,the numerical equation of the final ventilation characteristics was obtained,and the numerical simulation was realized.The experimental results show that the method can accurately simulate the direction and temperature distribution of wind flow in tunnels,and its partition accuracy increases considerably with the number of grids,with an average partition accuracy of 85%.Additionally,it can provide a basis for managing the construction projects of deep-buried long water-diversion tunnels.