Experimental study of natural ventilation for road tunnels with shafts

Obtains a similarity criterion for natural ventilation in road tunnels with shafts by a dimensional analysis. With approximate modeling method, carries out experiments with unidirectional-moving vehicles in a 1∶10 scale model tunnel. Testing results indicate that the required minimum air velocity is 0.33m/s for the self-simulating zone, and three effective vehicle-conditions are f0.8vt1.6, f0.8vt2 and f1.3vt2 for the minimum air velocity. Verifies the similarity criterion by comparing the dimensionless tested data with dimensionless theoretical results.