大型地下互通隧道射流风机升压特性数值模拟研究

Numerical Simulation and Study of the Boosting Capacity of Jet Fan in Large Underground Interchange Tunnels

根据流体力学的计算原理,采用CFD计算软件FLUENT,对深圳东部过境地下互通的两车道矩形直线隧道、两车道和三车道拱形小半径曲线隧道、四车道拱形直线隧道的射流通风流场和升压力情况进行了数值模拟。通过模拟射流风机升压力与理论计算升压力的比较,得到了两车道矩形直线隧道和拱形曲线隧道的升压力折减系数、三车道曲线隧道和四车道直线隧道的横向安装间距及升压力折减系数。模拟结果还表明,设计提出150m的纵向安装间距是满足要求的,在风机安装数量较多的情况下,可适当减小间距。该研究成果为依托工程的设计提供了指导,也可为类似工程提供参考。

Based on the fluid mechanics principle, a series of tunnel models for Shenzhen eastern transit underground interchange （linear rectangular tunnel with two-lane, small radius curve arched tunnels with two lanes and three lanes, Linear arched tunnel with four lanes） are built to simulate the flow field and pressure field in jet ventilation tunnels. Compare the numerical boosting capacity of jet fan with theoretical arithmetic one, the reduction coefficients in linear rectangular tunnel and curve arched tunnel with two lanes are obtained, and the transverse installation spacing between jet fans and the reduction coefficients in linear tunnel with four lanes and curve tunnel with three lanes are got. The results show that, the designed transverse installation spacing between jet fans, which is 150m, meet requirements, and when more than two fans are installed, the spacing could be appropriately reduced. The research results provide guidance for support project and other similar projects.