高海拔内燃牵引特长隧道运营通风技术研究

Operating Ventilation Technology for Diesel-hauled Train Crossing Extra-long Tunnels in High Altitude Plateau

研究目的:青藏铁路拉日线盆因拉隧道为高原、高寒地区内燃牵引特长隧道,共设1个斜井、3个横洞。拉日线隧址区特殊的气候条件及横洞的开通对隧道运营通风的影响亟待研究。本文基于拉日线NJ2型内燃机车排放指标检测值以及拉日线隧址区自然风现场观测结果,采用RNG k-ε湍流模型,模拟分析横洞对盆因拉隧道自然通风效果的影响,并确定不同横洞开通时,隧道内外自然风的关系,热位压作用对隧道内自然风的影响。研究结论:(1)运营通风建议方案为2#、4#横洞排风,拉萨端、日喀则端、3#横洞进风;(2)结合防灾,选用射流风机,正洞内安装风机,开启后风向应与车行方向一致;(3)该研究结果对推进我国高原地区长大隧道运营通风技术的发展有着积极意义。

Research purposes： The Penyinla tunnel, in the railway line from Lhasa to Shigatse, is a diesel -hauled, extra -long tunnel with high altitude and extremely cold climate. One deviated well and three cross -holes were built in the process of construction. Under the conditions of special climate in tunnel zone from Lhasa to Shigatse, the influence of cross - holes on operation ventilation needs to be studied urgendy. Based on detection value of emission index of NJ2 type diesel locomotives and the monitoring results of natural wind, the RNG k - e turbulence model was adopted to simulate and analyze the influence of cross - holes on natural ventilation in the Penyinla tunnel. The relationships of natural wind between outside and inside of tunnel, and the influence of thermal pressure on natural wind in the tunnel were confirmed when different cross -holes opening. Research conclusions： （1） The propositional projects for operating ventilation are as follows, the cross -holes numbering 2# and 4# are proposed as exhaust outlet, the portal to Lhasa,to Shigatse and the cross -holes numbering 3# are recommended as air inlets. （2） Combining with disaster - prevention, the wind direction of chosen jet fan for main tunnels should be same with the train movement. （3） The research results are useful to operation ventilation technology of long tunnel in high altitude area.