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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 the long road tunnel, it is often involved in the curved duct with guide vanes. In this paper, the local effect of the tunnel ventilation system is firstly discussed, and then the curved duct with the angles of 30 °, 60 ° and 90 ° and the concentric circles, The local resistance loss coefficient of thin circular and 95 ° thin round guide vane at right angle bend is obtained and compared with the empirical formula and the design parameters of the ventilation tunnel of road tunnel are further optimized the study. The results show that: (1) The coefficient of local drag loss in the straight duct is closely related to the type of guide vane and r / D (r / D) set. The guide vanes of different types of guide vane are only corresponding to the specific straight bend parameters r / D) to achieve a better diversion effect; (2) The use of a curved duct with an angle of 80 ° instead of a straight bend duct with guide vane is completely feasible.