Holographic interferometric observation of weak shock waves generated by entrance of a high-speed train into a long tunnel

Kazuyoshi Takayama; Akihiro Sasoh; Osamu Onodera; Ji-Ming Yang; Hidenori Ojima; Toshihiro Ogawa; Ryuichi Kaneko; Osamu Matsui

doi:10.1117/12.209615

30 May 1995 Holographic interferometric observation of weak shock waves generated by entrance of a high-speed train into a long tunnel

Kazuyoshi Takayama, Akihiro Sasoh, Osamu Onodera, Ji-Ming Yang, Hidenori Ojima, Toshihiro Ogawa, Ryuichi Kaneko, Osamu Matsui

Author Affiliations +

Proceedings Volume 2513, 21st International Congress on: High-Speed Photography and Photonics; (1995) https://doi.org/10.1117/12.209615
Event: High-Speed Photography and Photonics: 21st International Congress, 1994, Taejon, Korea, Republic of

Abstract

When a high speed train enters a long tunnel, compression waves which were generated in front of the high speed train, coalesce into a weak shock wave and the shock wave eventually is emitted from the tunnel exit as a sonic boom. In order to investigate the tunnel sonic boom a 1/300 scaled tunnel simulator was constructed in which a plastic cylinder slides down along a 8 degree(s) inclined long tube with a speed of 60 to 110 m/s. The high speed cylinder and the steel tube represent the train and the tunnel, respectively. Double exposure holographic interferometric flow visualization was used for clarifying the formation and propagation of weak shock waves in the scale tunnel simulator. For interpretation of behaviors of weak shock waves, a shock tube experiment was also carried out again by using holographic interferometry.

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Kazuyoshi Takayama, Akihiro Sasoh, Osamu Onodera, Ji-Ming Yang, Hidenori Ojima, Toshihiro Ogawa, Ryuichi Kaneko, and Osamu Matsui "Holographic interferometric observation of weak shock waves generated by entrance of a high-speed train into a long tunnel", Proc. SPIE 2513, 21st International Congress on: High-Speed Photography and Photonics, (30 May 1995); https://doi.org/10.1117/12.209615

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