| Title |
A Numerical Analysis on the Effect of Parameters for the Flow Rate through the Tunnel with Jet Fan Ventilating System |
| Keywords |
Road tunnel ; 도로터널 ; Ventilation ; 환기 ; CFD ; 전산유체역학 ; Jet fan ; 제트 홴 ; Roughness height ; 조도 |
| Abstract |
In the present study, ventilation flow rates and pressure rises through a road tunnel are simulated numerically using CFD with the various conditions such as roughness height, swirl angle of jet fan, entrance and exit effect and hub to tip ratio. By using a modified wall function, friction factor can be predicted under 10% of error with respect to the Moody chart for the circular pipe flow and 15%, for the present tunnel. For more precise design, the effects of the swirl angle and hub to tip ratio of jet fan, which is not included in the theoretical equation of pressure rise by jet fan are necessary to be considered. |