A fundamental study on the jet fan capacity for smoke control considering thermal buoyancy force in tunnel fires

Ho-Hyung  Lee; Pan-Gyu Choi; Jong-Bok Jo; Seung-Chul Lee; Chang-Woo Lee

doi:10.9711/KTAJ.2018.20.2.501

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2018 Vol.20, Issue 2 Preview Page Next Page

A fundamental study on the jet fan capacity for smoke control considering thermal buoyancy force in tunnel fires 터널 화재 시 열부력을 고려한 제연용 제트팬 용량산정에 관한 기초 연구

31 March 2018. pp. 501-511

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Abstract

As a result of the recent revision of the ‘Guideline for Installation and Management of Fire Prevention Facility in Road Tunnels’, the thermal buoyancy has to be taken into account when calculating the capacity of jet fans for smoke control in tunnel fires. However, there is no detailed methodologies for considering thermal buoyancy, so further study is needed. In this study, the thermal buoyancy in the tunnel is calculated by 3-D numerical simulation to consider the thermal buoyancy in case of fire in tunnels, and the relationship between heat buoyancy and vehicle drag, And the method of calculating the capacity of the jet fan for smoke control in tunnels. According to the analysis results, heat buoyancy acts as a resistance force in the case of a down-slope tunnel, and the pressure rise of jet fan for smoke control is not simply determined by the value of heat buoyancy at the entrance of the tunnel and the value of the vehicle drag at the exit. And it is analyzed that it is necessary to carry out a comprehensive review according to the location of the fire vehicle in tunnels.

Keywords

Road tunnel

Thermal buoyance force

Vehicle drag force

Simulation

Jet fan for smoke control

최근 ‘도로터널 방재시설 설치 및 관리지침’의 개정으로 인해 터널 내 제연용 제트팬의 용량 산정 시에는 열부력을 고려 하도록 규정하고 있다. 그러나 열부력을 고려하는 세부방법론에 대한 규정이 없어, 이에 대한 세부적인 추가 연구가 필요 한 실정이다. 본 연구에서는 터널 내 화재 시 열부력을 고려하기 위하여 3차원 수치해석 시뮬레이션을 수행하여 터널 내 열부력을 계산하고, 화재차량의 진행방향에 따라 열부력과 차량항력의 관계, 즉, 화재차량의 위치에 따른 터널 내 제연 용 제트팬 용량 산정방법에 대하여 검토를 수행하였다. 분석결과에 따르면, 하향경사 터널의 경우에는 열부력이 터널 내 저항력으로 작용하며, 터널 내 화재연기를 제연하기 위해 필요한 제연팬의 승압력은 단순히 터널 입구부의 열부력 값과 출구부의 차량항력값에 의해 단순히 결정되지 않으며, 터널 내 화재차량의 위치에 따라 종합적인 검토가 필요한 것으로 분석되었다.

키워드

도로터널

열부력

차량항력

수치해석

제연용 제트팬

References

Austrian Research Association for Roads, Rail and Transport (FSV) (2008), Guidelines and regulations for road construction (RVS 09.02.21).

Federal Department of Environment, Transport, Energy and Communications (2008), “Luftung der Strassentunnel Systemwahl; Dimensionierung und Ausstattung”, ASTRA 13001.

Korea Expressway Corporation (2012), A study on the improvement of the calculation criteria for the jet fan in road tunnels, pp. 120-141.

MOLIT (Ministry of Land, Infrastructure and Transport) (2011), Road design manual (617. Ventilation), pp. 617-28 - 617-35.

MOLIT (Ministry of Land, Infrastructure and Transport) (2016), Guidelines for fire prevention equipment’s installation and management in road tunnels, pp. 56-57.

The Norwegian Road and Transport Department (2010), Road Tunnels (Handbooks).

Yoo, J.O., Shin, H.J. (2013), “A numerical study on effects of thermal buoyance force on number of jet fans for smoke control”, Journal of Korean Tunnelling and Underground Space Association, No. 15, Vol. 3, pp. 301-310.

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 : 20
No :2
Pages :501-511
Received Date : 2018-02-13
Revised Date : 2018-02-23
Accepted Date : 2018-02-28
DOI :https://doi.org/10.9711/KTAJ.2018.20.2.501

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

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