摘要
为分析小半径曲线隧道射流风机布置方式对风机升压折减效率的影响,优化曲线公路隧道射流风机布置方式,采用CFD方法对曲线隧道内多种风机布置方式及射流特性进行三维数值模拟计算分析。结果表明,改变并列风机组横向位置,以隧道断面轴对称线为基准向隧道内侧移动0.5 m风机折减效率最高,其余位置风机折减效率不同程度下降;在满足隧道内建筑限界要求的基础上,风机组离拱顶越远风机折减效率越大;曲线隧道内,风机射流受到曲壁面的影响,射流特性较直线隧道更为复杂,风机诱导段距离约为90 m,风机组纵向间距应大于100 m。
To analyze the influence of the distribution of jet fans on the pressure-rise coefficient in curvy tunnel with small radius and find the optimal distribution of the jet fans, the CFD method was carried out to simulate and analyze the jet characteristics for some cases of various distributions of jet fans. The results show that （1） the pressure-rise coefficient is the largest when the fans are moved 0.5 m toward the inside from the centerline of the tunnel and other positions make the coefficient smaller. （2） the coefficient increases with the increase of the distance between jet fans and the ceiling of tunnel based on meet the request of the construction clearance; （3） the jet characteristics in curvy tunnel are more complicated than those in straight tunnel due to the constraint of the curvy walls, the distance of inductive ventilation is about 90 m and the longitudinal distance between jet fans should be more than 100 m.
出处
《公路交通科技》
CAS
CSCD
北大核心
2009年第5期86-90,共5页
Journal of Highway and Transportation Research and Development
基金
交通部西部交通建设科技资助项目(200831800058)
关键词
隧道工程
曲线隧道
数值模拟
射流风机
升压折减效率
tunnel engineering
curvy tunnel
numerical simulation
jet fan
pressure-rise coefficient
