Optimization Analysis of Two-direction Road Tunnel Ventilation System with Jet Fan

The tunnel carriageway U-turn and parking strip,which is built in the two-direction road tunnel for safety purpose.But the influence factors affecting the ventilation system with jet fan are complex,in terms of ventilation efficency.Based on the simulated (experment) results,the principles and methods of optimization design for ventilation system with jet fan are presented,as well as the(ventilation) parameter and the some experimental formulas have been presented,including the coefficient of pressure boost,the coefficient of local head loss of carriageway U-turn and parking strip,and the minimum distance between the jet fan and the U-turn,the jet fan and parking strip,the jet fan group,the jet fan and wall surface,and the center distance of the jet fan,the distance between jet fan and(tunnel) entrance,the boosting pressure calculation of composite airflow of different pressure,and the relationship between the boosting pressure and the number of jet fan set for optimum analysis are expounded.