| Title |
Effect of Rear-Vortex of a Convergent-Divergent Duct on the Flow Acceleration Installed in a Vertical Structure |
| Authors |
정광섭(Kwang-Seop Chung) ; 김철호(Chul-Ho Kim) ; 조현성(Hyun-sung Cho) |
| DOI |
http://dx.doi.org/10.6110/KJACR.2013.25.2.094 |
| Keywords |
벤투리관 ; 전산유체동력학 ; 와류효과 Venturi duct ; Computational Fluid Dynamics ; Vortex effect |
| Abstract |
A convergent-divergent nozzle or venturi nozzle has been used to accelerate the wind speed at its throat. The wind speed at the throat is inversely proportional to its area according to the continuity equation. In this numerical study, an airflow phenomena in the venturi system placed at a vertical structure was investigated to understand the vortex effect occurred at the rear- side of the vertical structure on the air speed increment at the throat of the venturi system. For this study, a venturi system sized by 20(m)×20(m)×6(m) was modelled and the area ratio(AR) of the model venturi was 2.86. To see the vortex effect on the air flow acceleration in the venturi throat, two different boundary conditions was defined From the study, it was found that the pressure coefficient(CP) of the venturi system with the vortex formed at the exit of the venturi was about 2.5times of the CP of the venturi system without the vortex effect. The velocity increment rate of the venturi system with the vortex was 61% but 9.5% only at the venturi system without the vortex. Conclusively, it can be said that the venturi system installed in a vertical structure has very positive effect on the flow acceleration at its throat due to the vortex formed at the rear-side of the vertical structure. |