터널 미기압파 저감을 위한 터널 갱문 확대 효과에 대한 수치 해석적 연구
A Numerical Study on Portal of tunnel Enlargement Effects to Reducing Micro Pressure Wave
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초록
Sudden pressure changes caused by the high-speed train entering the entrance of the tunnel are propagated into the tunnel and spread out around the tunnel in the form of a micro pressure wave at the exit of the tunnel. This phenomenon can cause noise and vibration around the tunnel, causing damage to the surroundings. Analysis of this phenomenon is very difficult, but the development of analytical technology has revealed more phenomena than in the past. In this study, we calculated effects of reducing Micro Pressure Wave(MPW) by applying portal of tunnel enlargement by CFD method. First, we calculated pressure variation on portal of tunnel entrance region without portal of tunnel enlargement. Second, patterns of pressure variation were identified on a various enlargement ratio of tunnel and optimized hood. Finally, we proposed optimized portal of tunnel shape on 250km/h.
Abstract
Sudden pressure changes caused by the high-speed train entering the entrance of the tunnel are propagated into the tunnel and spread out around the tunnel in the form of a micro pressure wave at the exit of the tunnel. This phenomenon can cause noise and vibration around the tunnel, causing damage to the surroundings. Analysis of this phenomenon is very difficult, but the development of analytical technology has revealed more phenomena than in the past. In this study, we calculated effects of reducing Micro Pressure Wave(MPW) by applying portal of tunnel enlargement by CFD method. First, we calculated pressure variation on portal of tunnel entrance region without portal of tunnel enlargement. Second, patterns of pressure variation were identified on a various enlargement ratio of tunnel and optimized hood. Finally, we proposed optimized portal of tunnel shape on 250km/h.
참고문헌 (9)
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