Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Comparative Analysis of Flow Characteristics Using Reflected Pressure Wave at Crossing of Subway Trains in Straight Tunnel

직선터널에서 지하철 열차의 교차운행 시 반사파 간섭에 따른 유동 특성 비교분석

  • Lee, Deuksun (Graduate School of Energy and Environment, Seoul National University of Science and Technology) ;
  • Cho, Jungmin (Graduate School, Seoul National University of Science and Technology) ;
  • Lee, Myeongho (Department of Mechanical & Automotive Engineering, Seoul National University of Science and Technology) ;
  • Sung, Jaeyong (Department of Mechanical & Automotive Engineering, Seoul National University of Science and Technology)
  • 이득선 (서울과학기술대학교 에너지환경대학원 플랜트엔지니어링학과) ;
  • 조정민 (서울과학기술대학교 대학원 기계공학과) ;
  • 이명호 (서울과학기술대학교 기계자동차공학과) ;
  • 성재용 (서울과학기술대학교 기계자동차공학과)
  • Received : 2017.12.20
  • Accepted : 2018.01.24
  • Published : 2018.03.10
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Abstract

In this study, CFD is used to compare and analyze the flow characteristics using reflected pressure wave during the intersection of two trains in straight tunnel. Two tunnels of different lengths; 600 m and 3,400 m were designed and numerical analysis of the flow characteristics of two tunnels carried out by setting the crossing state of the two trains at a constant velocity of 27 m/s form the center of the tunnel. The simulation model was designed using the actual tunnel and subway dimensions The train motion was achieved by using the moving mesh method. For the numerical analysis, $k-{\omega}$ standard turbulence model and an ideal gas were used to set the flow conditions of three-dimensional, compressible and unsteady state. In the analysis results, it was observed that the inside of the long tunnel without interference of the reflected pressure wave was maintained at a pressure lower than the atmospheric pressure and that the flow direction was determined by the pressure gradient and shear flow. On the other hand, the flow velocity in the short tunnel was faster and the pressure fluctuation was noted to have increased due to the reflected pressure wave, with more vortices formed. In addition, the flow velocity was noted to have changed more irregularly.

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References

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