| Not only the draft control system must satisfy the tunnel daily driving operation health,the safe request,satisfies in the tunnel fire situation to discharge fume system's effective operation to guarantee the tunnel security operation,moreover must reduce the energy consumption and the resources waste satisfiedly,reduces the tunnel operation cost the function.In this paper,the tunnel ventilation system is optimized to explore the highway tunnel rational,scientific,energy,economic ventilation system.The use of computational fluid dynamics software FLUENT simulation of a highway tunnel jet fan installed under the conditions of various flow patterns.Eventually proposed highway tunnel jet fan installation in a variety of conditions,the optimal program.Which need to optimize the installation of the main parameters are:(1)Dome from the convection fan and the impact of state(2)Fans around the impact of the distance between the state convection(3)The impact of Large section of three low-power portfolio with two powerful combination(4)Fans from outside the hole-side distance and the direction of the relationship between the natural wind(5)Fans from the hole-side distance and the size of the relationship between cross-section(6)Curve to air blower position influence(7)Cross-section of fans suddenly become larger distance between the impact of layoutAnalysis by simulating the main conclusion has(1)Conditions in the same direction,when the fans and the vault at 1.94 meters distance～2.09 meters,the velocity distribution of the most uniform,the speed of the most suitable size.That when fans and the vault at 1.94 meters distance～2.09 meters, the fan a more suitable layout;reverse condition,when the fans and the vault at 1.94 meters distance～2.09 meters,the velocity distribution of the most uniform,the speed of the most suitable size.That when fans and the vault at 1.94 meters distance～2.09 meters,the fan a more suitable arrangement.(2)Installation of two fans in parallel,with the condition,the proposed horizontal distance between two sets of fans from around 2.0m;reverse conditions,the proposed horizontal distance between two sets of fans from around 1.9m;three fans installed in parallel with the conditions,the proposed horizontal distance between fans from around 2.0m;reverse conditions,the proposed horizontal distance between fans from around 1.6m.(3)Required air volume for a great big cross-section of the three-lane tunnel,in the actual selection of the fan,you can select three-lane cross-section three large portfolio of low-power can also select high-power combination of two Units.By the speed of cross-section can be seen Figure:When the installation of two fans,the most uniform velocity distribution,the speed of the most suitable size.Note the installation of two fans,the fans a more suitable arrangement.(4)Outside when the fan speed and natural wind conditions at the same direction, the most uniform velocity distribution,the speed of the most suitable size.Note to fans installed in the same conditions,the fan a more suitable arrangement.(5)When the three-lane tunnels belong to large cross-section,the fans do not need to make special arrangements layout,and required only the same manner as the general cross-section can be arranged.(6)Bending angle when the tunnel for the 100~0～120~0,the tunnel radius of 150～250m,by numerical simulation can be seen:when the fan installed in the middle turn location,the most uniform velocity distribution,the speed of the most suitable size. Note the location of air between the installation of turn,the fan a more suitable arrangement.(7)When there is mutation of the tunnel when the fans try to be placed in three large sections lane.Try to reduce the fan blowing out the flow field in a collision at the loss of mutant Department.Finally,the ventilation system of Yan Men Guan lengthy highway tunnel is analyzed as the numerical simulation model,including its local and integral ducts.And lots of useful conclusions are achieved and the corresponding optimizational suggestions are supplied in the paper.
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