摘要
对内燃机车牵引条件下海拔3 000m以上、长度大于3km的山谷型老关角隧道和河谷型羊八井Ⅰ号隧道内正常运营期间的CO和NOx（换算成NO2）浓度及风速进行现场监测,并基于理论分析和一维数值模拟方法,研究内燃机车牵引条件下高海拔单线铁路隧道内的污染物扩散系数及自然通风界限。结果表明：内燃机车牵引条件下高海拔单线铁路隧道内的CO和NOx扩散系数与风速呈二次抛物线关系,且高海拔单线铁路隧道内的CO和NOx扩散系数远大于平原地区,采用瞬时点源一维扩散模型可以合理描述高海拔单线铁路隧道内污染物的扩散规律;对于长度在4km以下的高海拔单线铁路隧道,当内燃机车行驶速度超过48km·h-1、自然风速为1.5~2.0m·s-1时,可实现隧道内的自然通风。
Field monitoring was carried through on the concentration of CO and NOx （converted to NO2） and air speed during normal operation under diesel locomotive traction condition in the First Guanjiao Tunnel （mountain-valley type） and Yangbajing 1# Tunnel （river-valley type）, both 3 000 m above sea-level and with the length of more than 3 km. With theoretical analysis and one-dimensional numerical simulation method, the diffusion coefficients of pollutants and the natural ventilation threshold for single- track railway tunnel at high altitude under diesel locomotive traction were studied. The results show that, the diffusion coefficients of CO and NOx in single-track railway tunnel at high altitude under diesel locomo- tive traction have a quadratic parabola relationship with air speed and are far greater than those in plain area. The one-dimensional flow diffusion equation of instantaneous point source can reasonably describe the diffusion rule of pollutants in single-track railway tunnel at high altitude. For single-track railway tunnel at high altitude with the length less than 4 km, when the running speed of diesel locomotive is over 48 km . h-1 and the natural air speed is 1.5-2.0 m. s-1 , natural ventilation can be realized in the tunnel.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2015年第6期63-69,共7页
China Railway Science
基金
铁道部科技研究开发计划项目(20070301)
关键词
高海拔隧道
单线铁路隧道
内燃机车牵引
污染物
扩散系数
隧道通风
自然通风界限
High-altitude tunnel
Single-track railway tunnel
Diesel locomotive traction
Pollutant
Diffusion coefficient
Tunnel ventilation
Natural ventilation threshold
