摘要
交通风力的有效利用可减小隧道通风系统初投资及运行能耗。现有交通风力的计算方法,采用较多假设,计算精度低、耗时长。为解决现有计算方法中的问题,本研究创新性地将"移动参考系&周期性边界条件"的CFD方法应用于隧道车辆队列周围流场的数值模拟,且以试验结果验证不同工况下该方法的准确性;并基于此方法,探究了不同行车间距和阻塞比对隧道车辆空气阻力系数的影响规律。结果表明:1)"移动参考系&周期性边界条件"的CFD方法可快速、准确地计算隧道内车辆的交通风力;2)随着行车间距的增大,车辆空气阻力系数增大,行车间距超过180 m后无明显增加;3)随着阻塞比的减小,车辆空气阻力系数减小,阻塞比小于0.15后减小程度较小。本研究可为不同工况时的空气阻力系数计算提供依据,进而指导隧道通风系统设计与运行。
Effective utilization of traffic wind can reduce the initial investment and operating energy consumption of tunnel ventilation system.The existing methods of traffic wind calculation adopt many assumptions,and the calculation accuracy is low and the entire process is time-consuming.In order to solve the problems in the existing methods,this study innovatively applied the CFD method of"moving reference frames&periodic boundary conditions"to the numerical simulation of flow field around vehicles in tunnel.The test results were used to verify the accuracy of the method under different working conditions.Based on this method,this study explored the effect of different vehicle spacing and blockage ratio on the air resistance coefficient of tunnel vehicles.The results show that:1)The"moving reference frames&periodic boundary conditions"CFD method can quickly and accurately calculate the traffic wind in tunnel;2)As the vehicle spacing increases,the air resistance coefficient of the vehicle increases,and there is no significant increase after the vehicle spacing exceeds 180 m;3)As the blockage ratio decreases,the air resistance coefficient of vehicle decreases,and there is no significant decrease after the blocking ratio is less than 0.15.This study can provide a basis for calculating the air resistance coefficient under different working conditions,and offer guidance to the design and operation of the tunnel ventilation system.
作者
李保军
梁辰吉昱
南硕
蔡鑫
刘辉喜
邵晓亮
LI Baojun;LIANG Chenjiyu;NAN Shuo;CAI Xin;LIU Huixi;SHAO Xiaoliang(Shenzhen Traffic Facilities Construction Center,Shenzhen 518040,Guangdong,China;Tsinghua University,Beijing 100084,China;University of Science and Technology Beijing,Beijing 100083,China)
出处
《建筑科学》
CSCD
北大核心
2021年第4期77-82,共6页
Building Science
关键词
公路隧道
通风
数值方法
行车间距
阻塞比
highway tunnel
ventilation
numeral method
vehicle spacing
blockage ratio
