平板上の物体によるはく離流れから発生する騒音　　発生音の理論的検討と実験による検証

• 小池 勝

• 深野 徹

書誌事項

タイトル別名

• Noise Generated from Separated Airflow Caused by a Body on a Flat Plate. (Theory of Noise Generation and its Experimental Verification.)
• ヘイバンジョウ ノ ブッタイ ニヨル ハクリ ナガレ カラ ハッセイスル ソウ

抄録

Theories of aerodynamic noise generation from solid boundaries in airflow at low mach nmbers have been proposed by Curle and Powell-Howe. Acoording to the Curle's theory the noise sources are pressure fluctuations on the solid boundaries. On the other hand Powell-Howe showed that vortices in space are also the significant noise sources. The present authors verify that vortices in space can be effectively transformed to the pressure fluctuations on a solid boundary when the vortices approach in close vicinity of the solid boundaries. In the present experiment the parameters related to the noise generation such as the sound pressure level generated from separated airflow caused by a forward facing step or a fence on a flat plate, the pressure fluctuations on the solid boundaries and the flow velocity fluctuations were measured. By the examination of correspondence between the experimental results and the theories, it has proved that the agreement between the two is better in the Powell-Howe's theory than the Curle's theory. This result indicates that in the present experimental condition the dipoles of vortices distributed in space are stronger than the dipoles distributed over the surface of solid boundaries.

収録刊行物

• 日本機械学会論文集Ｂ編

  日本機械学会論文集Ｂ編 64 (619), 767-774, 1998

  一般社団法人 日本機械学会

キーワード

• Fluctuating Pressure

詳細情報

• CRID: 1390282680871883136
• NII論文ID: 110002396855
• NII論文ID: 130004222912
• NII書誌ID: AN00187441
• DOI: 10.1299/kikaib.64.767
• ISSN: 18848346
• ISSN: 03875016
• NDL書誌ID: 4435283
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4435283
• Web Site: http://www.jstage.jst.go.jp/article/kikaib1979/64/619/64_619_767/_pdf
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可