- Volume 21 Issue 9
Compression waves propagating in a high-speed railway tunnel develops large pressure fluctuations on the train body or tunnel structures. The pressure fluctuations would cause an ear discomfort for the passengers and increase the aerodynamic resistance of trains. As a fundamental research to resolve the pressure wave phenomenon in the tunnel, experiments were carried out by using a shock tube with an open end. A blockage to model trains inside the tunnel was installed on the lower wall of shock tube, thus forming a sudden cross-sectional area reduction. The compression waves were obtained by the fast opening gate valve instead of a conventional diaphragm of shock tube and measured by the flush mounted pressure transducers with a high sensitivity. The experimental results were compared with the previous theoretical analyses. The results show that the ratio of the reflected to the incident compression wave at the sudden cross-sectional area reduction increases but the ratio of the passing to the incident compression wave decreases, as the incident compression wave becomes stronger. This experimental results are in good agreements with the previous theoretical ones. The maximum pressure gradient of the compression wave abruptly increases but the width of the wave front does not vary, as it passes over the sudden cross-sectional area reduction.
- Jour. Fluid Mech. v.4 pp.337-360 On the Propagation of Shock Waves Through Regions of Non-Uniform Area or Flow Whitham, G. B.
- Jour. Fluid Mech. v.2 no.3 pp.286-298 The Motion of a Shock Wave in a Channel, with Applications to Cylindrical and Spherical Shock Waves Chisnell, R. F.
- トンネル出口微氣壓波の實能 小澤智;森藤達夫;前田達夫;木下眞夫
- 日本鐵道總硏報告 v.7 no.7 列車先頭部·後尾部形狀最適化のための風通試驗 井門郭志;飯田雅宣;前田達夫
- 入口緩衝工による備後トンネル微氣壓波の低滅 小澤智;內田俊孝;前田達夫
- 大韓機械學會論文集 v.18 no.10 高速鐵道 터널에서 發生하는 波動現象에 關한 衝擊波菅의 硏究1(壓縮波의 特性에 關하여) 金羲東
- 大韓機械學會論文集 v.21 no.1 急縮小菅을 傳播하는 壓縮波에 理論的 硏究 金羲東;金太昊
- ASME Trans. Journal Fluid Engineering Passive Control of Unsteady Compression Wave Using Porous Walls Kim, H. D.;Setoguchi, T.
- 大韓機械學會論文集 v.21 no.8 터널내를 주행하는 1열차의 공기역학적 해성 김희동
- The International Conference on Speedup Technology for Railway and Maglev Vehicles Effect of Ballast on Pressure Wave Propagating through Tunnel Ozawa, S.;Maeda, T.;Matsumura, T.;Uchida, K.
- 新幹線電車先頭部形狀モデルチェンジのための風通試驗 前田達夫;木下眞夫;種本勝二;本間 男
- 日本鐵道總硏報告 v.2 no.12 シミュレ-ションによる新幹線車輛換氣システムの檢討 善田康雄
- Proc. 8th Intl. Symp. on the Aerodynamics and Ventilation of Vehicle Tunnels pp.151-173 The Influence of Abrupt Changes in the Cross-Sectional Area of a Railway Tunnel on the Propagation of Pressure Waves Caused by Passing Trains Ottisch, F.;Shockel, H.;Peiffer, A.
- 新幹線電車(0系, 100系, 200系)の空氣抵抗 前田達夫;木下眞夫;梶山博司;種本勝二
- 大韓機械學會誌 v.36 no.1;3;5;10 高速鐵道의 空氣力學 김희동
- 日本鐵道總硏報告 v.3 no.4 人の耳っん感覺と氣壓變化 佐藤淸;池田守利;中川正祥
- Proc. of 7th Intl. Symp. on the Aerodynamics and Ventilation of Vehicle Tunnels Countermeasures to Reduce Micro-Pressure Waves Radiating from Exits of Shinkansen Tunnels Ozawa, S.;Maeda, T.;Matsumura, T.;Uchida, K.;Kajiyama, H.;Tanemoto, K.
- 大韓機械學會論文集 v.20 no.7 直管內를 傳播하는 壓縮波의 減裏와 變形에 관한 數値解析的 硏究 金羲東
- Transactions of JSME v.54 no.498 Initiation and Propagation of Shock Waves in the Exhaust Pipe of an Internal Combustion Engine Sekine, N., et. al.
- ASME Trans. Journal Fluid Engineering Passive Control of Impulsive Noise Caused by Unsteady Compression Wave Kim, H. D.;Setoguchi, T.
- Philosophical Magazine v.45 no.2 pp.1293-1301 The Quasi-Cylindrical Shock Tube Chester, W.
- 日本機械學會論文集 v.58 no.546 pp.331-337 管內を傳ぱする壓縮波の開口端からの放射 松尾一泰(外3人)
- 衝擊波の力學 生井武文;松尾一泰