Numerical Study of effects on micro-pressure wave reduction by a hood on a narrow tunnel

후드를 이용한 협소 터널 미기압파 감소 효과에 대한 수치적 연구

  • 윤수환 (서울대학교 기계항공공학부) ;
  • 김병열 (서울대학교 기계항공공학부) ;
  • 구요천 (서울대학교 기계항공공학부) ;
  • 이동호 (서울대학교 기계항공공학부) ;
  • 권혁빈 (한국철도기술연구원) ;
  • 고태환 (한국철도기술연구원)
  • Published : 2005.11.01

Abstract

The train entry into a tunnel generates a strong compression wave in the tunnel. The high amplitude of compression wave causes high pressure gradients that are responsible for both the aural discomfort of passengers and the impulsive acoustical wave called the miro-pressure wave. This paper provides a numerical study on effects of hood for micro'-'pressure wave reduction. An axisymmetric numerical solver, considering the cross sectional area of Korean Tilting Train eXpress, is used for a transient flow field in the tunnel. Results show that the micro-pressure wave is able to be reduced by a hood. In this results, the maximum reduction of micro--pressure wave is shown at 2L(length), 1.35D(diameter) hood around $56\%$ against the non-hood case.

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