In longitudinal ventilation road tunnel systems the booster fans are mounted close to the tunnel roof. Since velocities of the flow are high, the friction losses on the walls are an important elements in these types of application. Tests have been carried out to determine the effectiveness of the impulsive fan. The actual impulse force delivered has been measured on a tunnel model with standard ANAS (Italian Road Board) cross section. During the research the distance of the jet axis from the wall and the tunnel velocity have been varied. In the final test series the velocity distribution at the nozzle exit has been changed and the influence of the jet swirl has been evaluated.
Experimental Study on the Longitudinal Ventilation System
MARTEGANI, ANTONIO DARIO;PAVESI, GIORGIO;
1994
Abstract
In longitudinal ventilation road tunnel systems the booster fans are mounted close to the tunnel roof. Since velocities of the flow are high, the friction losses on the walls are an important elements in these types of application. Tests have been carried out to determine the effectiveness of the impulsive fan. The actual impulse force delivered has been measured on a tunnel model with standard ANAS (Italian Road Board) cross section. During the research the distance of the jet axis from the wall and the tunnel velocity have been varied. In the final test series the velocity distribution at the nozzle exit has been changed and the influence of the jet swirl has been evaluated.
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
