Once a fire occurs in long curve tunnel, the mixing of hot smoke flow and cold air leads to turbulence due curvature’s impact. This phenomenon results greater thermal pressure difference at source substantially temperature field than straight tunnel. The longitudinal flowing along wall loses lot velocity tunnel massive friction. Under same extinguishing conditions, have different requirements f...

There are several industrial methods for tunnel ventilation system design. In particular, for tunnels where axial flow fans are applicable, there are specialized computer programs that calculate the various pressure drops that consider wall friction and local losses due to signs and appurtenances, and considering vehicle emission factors based on up-hill or down-hill conditions, determine the n...

In order to solve the problems of large energy consumption existing in tunnel lighting control system, an automatic control system of tunnel lighting is designed based on stepless control method. The tunnel lighting control model is established based on “Specifications for Design of Ventilation and Lighting of Highway Tunnel (China)”. Simulation of tunnel lighting control based on the establish...

Subway is consisted of tunnels, platforms and ventilation shafts. The air flow between these structures forms a ventilation network. There is a need for fire modeling tools capable of both rapid and precise simulation for fire and smoke propagation in such ventilation network. Computational Fluid Dynamics (CFD) is widely used in subway fire performance design. However, the boundary conditions u...

In this paper, the impact of vehicles in road tunnel on smoke spread in case of fire is illustrated using the FDS (Fire Dynamics Simulator) system. FDS is a CFD-based fire field model capable to simulate fire in various environments capturing a big variety of physical processes related to fire. A set of simulations of fire in a 300 m long two-lane single directional road tunnel with longitudina...

The main ridge of the Alps lays just crosses Austria. Therefore it is not surprising that most highways in Austria do have to pass through a lot of road tunnels. Among these tunnels, some of the world longest tunnels for vehicle traffic are found. For safety reasons today all long road tunnels are planed with two tubes. Two tubes allow one way traffic in each tube. In the case of one way traffi...

There are many issues affecting multi-hole parallel tunneling and long tunnel ventilation, such as insufficient fresh air supplied at the face, pollution by contaminated winds, uncoordinated work among multiple fans. In view of these issues, this paper uses numerical simulation software Fluent combined with orthogonal analysis test method, and, based on actual working conditions Yuelongmen Tunn...