The Model Experiment Of Xuefengshan Mountain Tunnel Ventilation System

Ventilation system is a most important component of long road tunnel, and the ultimate goal of ventilation system design lie in meeting the ventilation under the fire risk and dilute the contamination under operating mode. This research adopts the organic glass to make the large proportion tunnel model of 1:10 according to the similar principle of the experiment of the model, allocate five 15kw frequency modulation air fans to pump and extraction air, use model experiment to prove the rationality of the design of Xuefengshan mountain tunnel ventilation system, and study the pressure balancing mode and operating mode while ventilating and running. Adopt 1:1 speed, add obstruction bar and rough the interior wall to receive the same pressure variation tendency and speed change mode as prototype tunnel. With advanced measurement tools, to measure wind speed for 8 points and pressure for 16 points with high accuracy at the same time. Through this method can understand the speed and pressure data in the whole tunnel, and can carry on with the prototype tunnel correspondingly. For guarantee true dependability of experiment , is it step up the experiment along the tunnel obstruction coefficient experiment , obstruction through bar experiment and efflux air blower to go on at first.In the experiment, carry on the operating mode experiment under various kinds of situations and arrange the smoke extraction experiment mainly, also adjust every fan at different revolution to study the relation of influencing by each other adjusted. While ventilating regulating while running in the tunnel , should have priority to choose the air blower that exert a largest influence on this section of wind amount to regulate , when the fire is ventilated , make tunnel wind speed keep in minimum wind speed that smog does not flow back , is it is it adjust efflux quantity of turning on of air blower to come according to traffic size of wind to need then, draw some important conclusion can run to tunnel ventilation of regulate the reference of offering. the result can give reference to the operating mode of ventilation. At the same time, this model experiment indicates that the design of ventilation of this tunnel is rational basically, can meet various kinds of run operating mode that request the quantity of fresh air, can control to fire exhaust gas organization of operating mode effectively too, can guarantee that the exhaust gas is listed according to the way of plan.