円管内の気流に関する研究 : 第2報, 管内に短い円棒を押込んだ場合

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タイトル別名
  • Studies on the Air Current through Pipes : 2nd Report, In the Case where a Short Column Is Inserted in the Pipe
  • エン カンナイ ノ キリュウ ニ カンスル ケンキュウ 2

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抄録

The author performed his quantitative experiment as a part of the series of experiment for the purpose of investigating the air current when the train ran into the tunnel. To make the matter simple, he conducted his experiment, by running, through a pipe, a column made short so as it might correspond to the real length of the train. Measuring the velocities of the air currents at both the entrance and exit as well as the inside of the pipe with a hot-wire anemometer, the results thus obtained were compared with the theories, taking the influence of the boundary layer appeared along the surface of the column in consideration. And because a turbulent flow of air occurred during the experiment, it cannot be said to have achieved the perfect agreement between both the experimental and theoretical values, but it has been found that they seem to nearly agree with each other. On the other hand, the direction of the air current was checked by way of observing the inclination of pieces of paper or of taking streamline-photographs of the water flowing, and in both cases, good agreement with the theoretical values was acquired.

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