摘要
在长大公路隧道通风系统中,经常涉及到设置导流叶片的弯曲风道。本文首先对隧道通风系统弯道局部效应进行了探讨,继而采用有限元数值模拟方法系统研究了角度分别为30°、60°、90°的弯曲风道及含同心圆型、翼形、107°薄圆形、95°薄圆形导流叶片直角弯曲风道的局部阻力损失系数,并将其计算结果与经验公式进行对比验证,在此基础上对公路隧道通风弯道设计参数进行了进一步优化研究。研究结果表明:(1)直弯风道内局部阻力损失系数与所设置的导流叶片类型及直弯参数(r/D)密切相关,不同类型导流叶片的设置只有对应特定的直弯参数(r/D)才能达到较好的导流效果;(2)采用角度为80°的弯曲风道取代设置导流叶片的直弯风道完全可行。
In the ventilation system of long highway tunnel, there is often concern of the use of bending-ducts with diversion vanes. At first, this paper explores the problem of the local loss effect in ventilation system in the tun- nel, then, by means of numerical simulation, studies the local loss coefficients of bending-ducts with an angle of 30°, 60° and 90 °and the ducts with the diversion vane of the types as concentric circle, wing, 107° thin circular, 95 °thin circular, at the same time, empirical formula are used to test and verify the reliability of the model parameters, final- ly, the bending-duct parameter in road tunnel design is optimized based on the acquired conclusion. It is concluded that： （ 1） The local loss coefficient of bending-duct is closely related to the types of diversion vane and the parameter r/D, the diversion effect would be better as various diversion vanes meet the specified r/D ; （ 2 ） The feasibility of replacing diversion vane by adjusting different bending-duct angle is verified.
出处
《地下空间与工程学报》
CSCD
北大核心
2014年第2期455-459,共5页
Chinese Journal of Underground Space and Engineering
基金
交通部西部建设科技项目(2013 318 802 400)
关键词
通风
弯曲风道
数值模拟
局部阻力损失系数
导流叶片
ventilation
bending-duct
numerical simulation
local loss coefficient
diversion vane
