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Numerical Analysis on the Effect of Parameters that Affect the Flow Rate through the Tunnel with Jet Fan Ventilation System  

Kim, Sa-Ryang (Department of Precision Mechanical Engineering, Kangnung National University)
Hur, Nahmkeon (Department of Mechanical Engineering, Sogang University)
Kim, Young-Il (Thermal/Flow Control Research Center, KIST)
Kim, Ki-Jung (Graduate School, Sogang University)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.11, no.4, 2003 , pp. 178-187 More about this Journal
Abstract
In this study, ventilation flow rate and pressure rise through a tunnel are simulated numerically using computational fluid dynamics (CFD) for various conditions such as roughness height of the surface of tunnel, swirl angle and hub/tip ratio of jet fan, and entrance and exit effects. By using a modified wall function, friction factor can be predicted with respect to the Moody chart within 10% of error for the circular pipe flow and 15% for the present tunnel. For more accurate design, the effect of the swirl angle and hub/tip ratio of jet fan, which is not included in the theoretical equation of pressure rise by jet fan needs to be considered.
Keywords
Tunnel; Jet fan; Ventilation; Pressure rise; Friction factor; CFD; Roughness height; Swirl angle; Hub/tip ratio;
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  • Reference
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