Flow Pattern Around Cylinder with Spherical Front-Side and Its Aerodynamic Sound

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  • 121 先頭が球面の円筒体周りの流れとその発生音
  • セントウ ガ キュウメン ノ エントウタイ マワリ ノ ナガレ ト ソノ ハッ

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Abstract

The aerodynamic sound generated from the high speed train under progress of speed up program is now a great issue. This aerodynamic sound radiating from a half-cylindrical train model with a quarter spherical front nose and the behaviour of an air-flow created around this model are measured in a low-noise wind tunnel. This paper presents a study of an appearance of generated sound referring to the graphical flow pattern. The case that there is a quarter sphere at the tail part of model is compared the case that there is none. If the cylinder is long, the presence of the tail part or none will have a small influence on the generated sound. On the other hand, if the cylinder is short, the sound without the tail part is bigger than that with it.

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