Model Experiments on the Tunnel Compression Wave Using an Axisymmetric and Three-Dimensional Train Model
Generation of the compression wave by a train entering a tunnel is investigated by model experiments. In the model experiments, the train and the tunnel are represented by an axisymmetric model, a three-dimensional mirror image model and a three-dimensional model. The experimental results indicate that the effect of the three-dimensionality of the train nose shape is approximately 2 % for the pressure gradient of the compression wavefront when the train nose is streamlined, hence without large flow separation around the train nose. Furthermore, the relationship between the pressure gradient of the compression wavefront and the train position in a cross-section at the tunnel portal is clarified.
KeywordsCompression Wave Tunnel Model Tunnel Entrance Tunnel Exit Normalize Pressure Gradient
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- 1.Yamamoto, A.: Micro-pressure wave radiated from tunnel exit. Preprint of the Spring Meeting of Physical Society of Japan(1977) (in Japanese)Google Scholar
- 2.Ozawa, S., Uchida, T., Maeda, T.: Reduction of micro-pressure wave radiated from tunnel exit by hood at tunnel entrance. Quarterly Report of RTRI, Japanese National Railways 19(2), 77–83 (1978)Google Scholar
- 3.Ozawa, S., Maeda, T.: Model experiment on reduction of micro-pressure wave radiated from tunnel exit. In: Proceedings of the International Symposium on Scale Modeling, pp. 33–37 (1988)Google Scholar
- 4.Iida, M., Matsumura, T., Nakatani, K., Fukuda, T., Maeda, T.: Optimum nose shape for reducing tunnel sonic boom. In: International Conference on Better Journey Time - Better Business, IMechE Conference Transactions, pp. 271–280 (1996)Google Scholar
- 5.Bellenoue, M., Kageyama, T.: Reduced scale simulation of the compression wave generated by the entry of a high-speed train into tunnel. TRANSAERO - A European Initiative on Transient Aerodynamics for Railway System Optimisation, Notes on Numerical Fluid Mechanics and Multidisciplinary Design 79, 206–216 (2002)Google Scholar
- 6.Doi, T., Kaku, J., Masubuchi, T., Ogawa, T.: Development of an experimental apparatus for measuring a pressure wave generated by a model train of actual shape. In: Proceedings of the INTER-NOISE (2006)Google Scholar
- 7.Saito, H., Fukuda, T.: Three-dimensional model experiment on the compression wave generated by a train entering a tunnel. In: Proceedings of the 16th Joined Railway Technology Symposium, vol. 09(65), pp. 367–370 (2009) (in Japanese)Google Scholar
- 9.Tanaka, Y., Iida, M., Kikuchi, K.: Method to simulate generation of compression wave inside a tunnel at train entry with a simple geometry model (influence of the offset of train axis and the ground plane). Transaction of the Japan Society of Mechanical Engineers, B 69(683), 1607–1614 (2003) (in Japanese)CrossRefGoogle Scholar
- 10.Fukuda, T., Iida, M.: Model experiments on aerodynamics in train-tunnel system. The Journal of the Acoustic Society of Japan 63(9), 543–548 (2007) (in Japanese)Google Scholar
- 11.Hara, T.: Aerodynamic force acting on a high speed train at tunnel entrance. Quarterly Report of RTRI, Japanese National Railways 2(2), 5–11 (1961)Google Scholar