| In the tunnel,the harmful gases and rolled dust discharged from the vehicle will affect the safety and damage to the human body under the special structure and environmental conditions of the long tunnels.It is also caused by the traffic jam and the occurrence of major traffic accidents factor.So the long tunnel must be ventilated,and control by multi-system integrated computer center whose core is the ventilation control,So that it can provide a guarantee for fast and safe driving and good environment in the tunnel.Advanced ventilation control system is not only used to enhance the ventilation effect and driving safety and comfort,in the reduction of power consumption also has a huge role,in addition,it is also a key technology to promote high-grade highway to achieve high speed,fast efficiency,safety and comfort,it is very important in energy saving,disaster prevention and traffic safety and comfort improvement.Taking a highway tunnel as an example,this paper studies the diffusion of pollutants in full-flow longitudinal ventilation.According to the "Specifications for Design of Ventilation and Lighting of Highway Tunnel"(JTJ 026.1-1999)requirements,Combine with tunnel parameters to get their ventilation hygiene standards and then calculate the number of jet fan configuration;And then based on the actual situation assume the jet fan several distribution.Finally,CFD software is used to simulate the simulation,which there is a direct relationship between the normative smoke concentration and the coarse and fine particles,The distribution state of the former can be obtained by simulating the distribution of the latter three.The simulation results show that:(1)The concentration of smoke in the tunnel where the jet fan is evenly distributed,the dilution effect of the fan is gradually reduced along the direction of the flow of the tunnel,and the increase rate of the smoke concentration is decreasing,and there is a higher smoke concentration area near the fan exist;(2)Before and after the two groups of wind turbine spacing is inconsistent,the smoke on both sides of the tunnel dilution effect is good,but at the same time will reduce the dilution of the middle of the tunnel smoke,and will increase the fan below the smoke concentration and range,but with the number of fans Increase,this effect or gradually disappear;(3)Before and after the two groups of fan height is inconsistent,the fan position is relatively high area below the smoke concentration value is higher,the smoke on both sides of the tunnel has a good dilution effect.When the height and spacing of the fan are consistent,the evenly distributed fan form is more conducive to the dilution of the tunnel smoke concentrationAfter the same pollutant concentration conditions,which the sum of the power of the fan as a whole,the fan running power is low and the fan number is more,compare with pollutant dilution effect of the tunnel when the fan running high power and the number of less the former is obviously superior to the latter.Therefore Based on this and combine frequency conversion technique,propose a fuzzy control method of frequency conversion ventilation in tunnel and designe a fuzzy control system,with the help of simulation function,establishe a fuzzy control rule base,and it is corrected with the actual condition to obtaine better control ability.Then,taking a tunnel as an example,analyze the fuzzy control and compared with the traditional control method obtaine the advantages of ventilation and the advantages of energy saving. |
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