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Research Article

A Numerical Analysis on the Determination of Shock Loss Coefficient at Flared Intersection of Network-type Double-deck Road Tunnel

네트워크형 복층 도로터널 확폭구간에서의 충격손실 계수 결정을 위한 수치해석 연구

Yo Han Park1
,
Seung Junk Lee1
,
Jin Kim1*
박 요한1
,
이 승준1
,
김 진1*
1Deptment of Energy Resources Engineering, Inha University
1인하대학교 에너지자원공학과
* 교신저자* Corresponding Author
1 February 2018. pp. 111-124
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Abstract

The purpose of this study is to analyze ventilation design factor for network-type double-deck road tunnel that have been developed actively around the world. A numerical analysis was carried out through computational fluid dynamics (CFD) to derive shock loss coefficient that occurs due to the change in cross sectional area at both merging section and diverging section. The model used for the numerical analysis is real-scale model and the reliability of the result is secured by comparing with the coefficient of the previous studies. As a result of this study, shock loss coefficient was calculated depending on the change in cross-sectional area ratio and was higher than the result of previous studies in case of both merging section and diverging section. It is considered that the characteristics of the geometrical structure of network-type double-deck road tunnel have a great impact on shock loss coefficient. Therefore, the result of this study is expected to be helpful for more accurate ventilation design of network-type double-deck road tunnel.

Keywords
Network double-deck road tunnel
Flared Intersection
CFD
Shock loss coefficient

본 연구는 전세계적으로 활발하게 기술 개발 중인 네트워크형 복층 도로터널에서의 환기 설계를 위해 새롭게 요구되는 설계인자를 분석한다. 분류 및 합류부 지점에 존재하는 확폭구간에서 단면적의 변화에 따라 발생하는 충격손실계수를 결정하기 위해 전산유체역학(CFD)를 통한 수치해석 연구를 진행하였다. 수치해석에 사용된 모델은 실제 스케일을 반영하였고 이전의 선행 연구의 충격손실계수 값과의 비교분석을 통해 그 값의 신뢰성을 확보하였다. 수치해석 연구의 결과로 단면적비의 변화에 따른 충격손실계수 값을 도출해냈고 급확대부와 급축소부 두 경우 모두 이전의 선행 연구에서 제시된 충격손실계수 값보다 높게 계산되어졌다. 이는 네트워크형 복층 도로터널의 기하학적 구조의 특성이 충격손실계수에 미치는 영향이 크다고 판단된다. 따라서 본 연구의 결과 값은 앞으로 네트워크형 복층 도로터널의 환기 설계에 있어 좀 더 정확한 설계에 도움이 될 것으로 기대된다.

키워드
네트워크형 복층 도로터널
확폭구간
전산유체역학
충격손실계수
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Information
  • Publisher :Korean Society for Rock Mechanics and Rock Engineering
  • Publisher(Ko) :한국암반공학회
  • Journal Title :Tunnel and Underground Space
  • Journal Title(Ko) :터널과 지하공간
  • Volume : 28
  • No :1
  • Pages :111-124
  • Received Date : 2018-02-12
  • Revised Date : 2018-02-23
  • Accepted Date : 2018-02-23
  • DOI :https://doi.org/10.7474/TUS.2018.28.1.111
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