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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.19 No.2

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

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2017, v.19 no.2, pp.213-229
https://doi.org/10.9711/KTAJ.2017.19.2.213




& (2017). Development of a program to predict the airflow rate and pollutant concentration in complex network-type tunnels. (사)한국터널지하공간학회, 19(2), 213-229, https://doi.org/10.9711/KTAJ.2017.19.2.213

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 networktype 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
터널환기, 네트워크, 프로그램, Gradient 법, 농도계산, Tunnel ventilation, Network, Program, Gradient method, Calculation of concentration

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