Phase Averaging Analysis of Periodically Fluctuated Separated Shear Layer

• YAMAGISHI Masaki

  長岡高専

• TOGANO Tomoko

  大妻女子大

• TASHIRO Shinichi

  都立科技大

Bibliographic Information

Other Title

• B109 周期的変動を受ける剥離せん断層の位相平均解析
• シュウキテキ ヘンドウ オ ウケル ハクリ セン ダンソウ ノ イソウ ヘイキン カイセキ

Abstract

The vortex structures in a separated flow region are generated by the motion of the separated shear layer caused by the introduction of periodic fluctuation. The main cause of the motion of the separated shear layer is the external fluctuation with the characteristic frequency. In order to investigate the principle motion of the velocity field, phase averaging was conducted to the velocity signals obtained by single hot-wire measurement. In phase averaging, wavelet transformation was applied to obtained the dominant frequency and the characteristic phase angle in the fluctuation. The profiles of the averaged velocity could be found and discussed. The profiles vary dynamically at each phase angle and show the periodic motion of the shear layer. The separated shear layer flutters with the external fluctuation in the mean flow. If the suitable frequency is selected in the external fluctuation, the separated flow region disappears in almost all phase angles owing to the depression of the shear layer near the wall.

Journal

• Journal of the Visualization Society of Japan

  Journal of the Visualization Society of Japan 23 (Supplement1), 87-90, 2003

  The Visualization Society of Japan

Keywords

• Separated flow
• Shear layer
• Wavelet transformation
• Phase averaging

Details

• CRID: 1390001204619855104
• NII Article ID: 10012625025
• NII Book ID: AN10374478
• DOI: 10.3154/jvs.23.supplement1_87
• ISSN: 1884037X
• ISSN: 09164731
• NDL BIB ID: 6641095
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6641095
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed