A Study on Vehicle Drag Coefficients in Domestic Road Tunnels

Chang-Woo* Lee; Kyeong-Bok Lee

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2005 Vol.7, Issue 4 Preview Page Next Page

A Study on Vehicle Drag Coefficients in Domestic Road Tunnels 국내 도로터널내 차량항력계수 관련 연구

31 December 2005. pp. 313-321

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Abstract

Drag coefficient is one of the critical design factors to quantify the piston effect in vehicle tunnels. Several problems are raised on the drag coefficient currently applied for the ventilation system design; unverified adoption of the projected frontal area of the vehicle from the foreign study in the past, and lack of consideration for the slip-streaming effect. This study aims at better estimation of the traffic-induced ventilation force in the local tunnels. Values for the projected frontal area of the vehicles running on the local roads at present are proposed and results of an extensive CFD study are studied on the slip-streaming effects in various traffic conditions to quantify Kblockage and the drag coefficient in the domestic tunnels.

Keywords

Piston effect

drag coefficient

streaming effect

blockage ratio

터널환기력 중 중요한 비중을 차지하고 있는 교통환기력을 추정하는데 있어서 항력계수는 중요한 설계인자이다. 현재 국내 도로터널 환기시스템 설계시 적용하고 있는 항력계수는 국내 차량특성을 고려하지 않은 외국자료의 인용, 폐색율 만에 기초하며 슬립스트리밍효과를 고려하지 않고 있는 문제를 가지고 있다. 본 논문에서는 국내 터널내 교통환기력의 정확한 추정에 목표를 두고 (1) 현재 운행 중인 국내차량 특성을 고려한 전면 투영면적를 추정하고, (2) 도로서비스 수준별 차량배치상황을 CFD분석하여 슬립스트림밍 효과를 분석하여 차량 1대당 저항계수인 Kblockage와 항력계수를 분석하였다.

키워드

교통환기력

항력계수

슬립스트리밍효과

페색율

References

1.Glerum, L.S., et al., 1991, Ventilation of Road Tu-nels, Royal Institute of Engineers (KIVI), Mi-nistry of Transport, Public Works and Water Management

2.Permanent International Association of Road Cong-ress (PIARC), 1995, Road Tunnels: Emissions, Vent-ilation, Environment, XXth World Road Congress in Montreal

3.일본도로공단, 1997, 설계요령, 제3집 터널, pp. 55-70

4.Bruin, A.C., Maarsing, .R.A and Swart, L., 1997, New Attempts to Solve an Old Problem: Aero-dynamic Measurements in New Vehicle Tunnels, Proceedings of the 9th Symposium on Arody-namics and Ventilation of Vehicle Tunnels, pp. 3-23.

5.Anon., 1999, Memorial Tunnel Fire Ventilation Test Program, Phase IV Report, Bechtel/Parsons Brinckerhoff

6.한국도로공사, 2002, 고속도로 환기시설 설계기준

7.Jang, H.M. and F. Chen, 2002, On the Deter-ination of the Aerodynamic Coefficients of Highway Tunnels, J. of Wind Engineering and Industrial Aerodynamics, vol. 90, pp. 869-96

Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 7
No :4
Pages :313-321

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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