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http://dx.doi.org/10.9711/KTAJ.2017.19.2.213

Development of a program to predict the airflow rate and pollutant concentration in complex network-type tunnels  

Kim, Hyo-Gyu (JS G&B Inc.)
Choi, Pan-Gyu (JS G&B Inc.)
Ryu, Ji-Oh (Dept. of Automotive Engineering, Shin-Han University)
Lee, Chang-Woo (Dept. of Energy and Mineral Resources Engineering, Dong-A University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.19, no.2, 2017 , pp. 213-229 More about this Journal
Abstract
Recently, in urban areas there is a tendency to construct more complex network-type tunnels including entrance and exit ramps. At the same time, various one-dimensional programs based on the network theory have been proposed for tunnel ventilation analysis. This paper aims at developing a program that can analyze the ventilation flow rate and pollutants concentration in complex network-type tunnels based on the none hardy-cross method. The flow analysis in the branch was carried out on the basis of the Gradient method, while for the concentration analysis a new logic has been developed to calculate the inflow and outflow concentration automatically in a complex network-type structure. Additionally, in the tunnel segments showing low flow rate, proper grid interval sizes were proposed to reduce numerical error. To verify the applicability of the program, flow rates predicted in the straight tunnels were compared with the classical velocity-diagram method by Stokic and the TVSDM program. The results showed that the errors were within 1%. In addition, the program was applied to the recent ventilation system adopted in the complex network-type urban tunnels.
Keywords
Tunnel ventilation; Network; Program; Gradient method; Calculation of concentration;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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