乱流境界層における速度欠損分布の相似性

• 早川 道雄

  北大・工

書誌事項

タイトル別名

• Similarity of Velocity-Defect Profile in Turbulent Boundary Layer.
• ランリュウ キョウカイソウ ニ オケル ソクド ケッソン ブンプ ノ ソウジセイ

抄録

Available experimental data of the flat-plate turbulent boundary layer have been resurveyed with focussing primarily on the outer layer. An appropriate velocity scale for the outer layer was found to be the external velocity multiplied by the ratio ofdisplacement thickness to boundary layer thickness, rather than friction velocity. In terms of this new scaling, the velocity-defect profile shows an excellent similarity for Re _??_ 2500 (Re is the Reynolds number based on momentum thickness). The mean velocity is approximately proportional to a half-power of the distance from the wall over a significant portion of the outer layer. While there is a region in which the mean velocity shows log-linear variation, the slope of the logarithmic law appears to be dependent on the Reynolds number for Re _??_ (2-3) × 10⁴. The above-mentioned similarity does not hold in the lower Reynolds number range of Re _??_ 2000.

収録刊行物

• 日本流体力学会誌「ながれ」

  日本流体力学会誌「ながれ」 18 (3), 171-179, 1999

  社団法人 日本流体力学会

キーワード

• Turbulent boundary layer
• Similarity
• Outer layer
• Velocity-defect law
• Logarithmic law

詳細情報

• CRID: 1390001204694338432
• NII論文ID: 130003817844
• NII論文ID: 10005336254
• NII書誌ID: AN00175191
• DOI: 10.11426/nagare1982.18.171
• ISSN: 21854912
• ISSN: 02863154
• NDL書誌ID: 4781608
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4781608
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可