Experimental device and method for determining minimum air duct area of actual engineering tunnel

The invention relates to an experimental device and method for determining the minimum air duct area of an actual engineering tunnel. The experimental device comprises a tunnel experimental model, a fan, an air duct plate and an adjusting mechanism, wherein the air duct plate is assembled with the tunnel experimental model in a sliding sealing connection mode, and the adjusting mechanism is arranged under the air duct plate and used for supporting and adjusting the height of the air duct plate so as to change the air duct area. The experimental device with the adjustable air duct area can be used for simulating the ventilation and smoke exhaust conditions in an actual engineering tunnel ventilation system, and conditions are created for determining the minimum air duct area in the actual engineering tunnel ventilation system. On the other hand, the experimental device and method for determining the minimum air duct area of the actual engineering tunnel can provide a theoretical basis for the structural design