トンネルを伝ぱする衝撃波の密度勾配部通過による制御 : 密度分布形状の効果

概要

論文の詳細を見る
Modern trains, such as the Shinkansen, pass through long tunnels at such a high speed that a pressure wave or weak shock wave generated at the nose of the train causes a large booming sound at the outlet of the tunnel. The authors have proposed the creation of a density gradient in the air in a tunnel at the exit for an interval of several times the tunnel height. In this report, more realistic patterns of the density distribution than previous one are discussed. Wedge shaped low density regions are created at the exit of the tunnel. The effects are discussed by both computer simulations and model experiments. They predict that the proposed density distributions can reduce the pressure gradients of the shock waves lower than previous pattern and they can also give preferable effect on the reduction of booming sound.
社団法人日本機械学会の論文
1995-01-25