| Title |
Ventilation Characteristics by Traffic Piston Effect in Underground Network-type Road Junction |
| Authors |
Nam-Young Kim ; Jong-Bok Jo ; Hwataik Han |
| DOI |
http://dx.doi.org/10.6110/KJACR.2015.27.7.337 |
| Keywords |
터널환기 ; 지하도로 ; 교통환기력 ; 입체교차로 ; 환기특성 Tunnel ventilation ; Underground road ; Piston effect ; Junction ; Ventilation characteristics |
| Abstract |
This paper investigates the ventilation characteristics in a two-dimensional underground network junction composed of four main lines interconnected by eight ramps. Simple one-dimensional models cannot be applied to network junctions since there are interferences of traffic piston effects in the main lines and at the ramps. A numerical algorithm was developed to analyze the pressure and airflow distributions iteratively. The Darcy-Weisbach equation was used to calculate the piston effects by traffic flows, and a Hardy Cross iteration was conducted for network analysis at the interconnected junction. The results show interesting ventilation characteristics and CO concentration distributions depending on system parameters such as vehicle speed, tunnel diameter, and other junction configurations. |