双向行车公路隧道射流通风系统优化分析

针对双向行车公路隧道设置回车道、紧急避车带的特点,根据隧道射流通风原理和模拟试验结果,对射流特性、通风效率进行了阐述和分析。提出了射流通风系统优化设计的原则和方法,给出了升压系数,回车道、停车带局部阻力系数等通风参数的计算公式,并对射流风机与回车道、停车带最小间距,射流组的最小控制间距,风机的壁面距,风机中心距,机组洞口距,不同压源共同作用下的射流增压的计算,风机增压与风机组数的关系进行了论述,以保证通风系统的合理布局。

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.