The Proceedings of the Fluids engineering conference
Online ISSN : 2424-2896
2018
Session ID : GS7-4
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Model Experiments on the Effect of the Cross-sectional Area of the Tunnel Hood
*Takashi FUKUDAShinya NAKAMURATokuzo MIYACHISanetoshi SAITO
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Abstract

The tunnel hood is one of the countermeasures for reducing the micro-pressure waves emitted from high-speed railway tunnels. The experiments using the axisymmetric models were conducted for investigating the effect of the conventional vented hood and the cross-sectional area of the unvented hoods. The ratios of the cross-sectional area of the unvented hoods to that of the tunnel were set to 1, 1.4, 2, 2.5, and 3. The results show that the optimum ratio of the cross-sectional area of the unvented hood is 2.5, and the effect of the unvented hood of the optimum crosssectional area with the length of 30 m is equivalent to that of the vented hood of the length of 50 m in the case where the train nose length and its speed are 15 m and 360 km/h, respectively.

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© 2018 The Japan Society of Mechanical Engineers
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