Development of streamwise counter-rotating vortices in flat plate boundary layer pre-set by leading edge patterns

S. M. Hasheminejad*, H. Mitsudharmadi, S. H. Winoto, H. T. Low, Kim Boon Lua

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Development of streamwise counter-rotating vortices induced by leading edge patterns with different pattern shape is investigated using hot-wire anemometry in the boundary layer of a flat plate. A triangular, sinusoidal and notched patterns with the same pattern wavelength λ of 15 mm and the same pattern amplitude A of 7.5 mm were examined for free-stream velocity of 3 m/s. The results show a good agreement with earlier studies. The inflection point on the velocity profile downstream of the trough of the patterns at the beginning of the vortex formation indicates that the vortices non-linearly propagate downstream. An additional vortex structure was also observed between the troughs of the notched pattern.

Original languageEnglish
Pages (from-to)168-179
Number of pages12
JournalExperimental Thermal and Fluid Science
Volume86
DOIs
StatePublished - 1 Jan 2017

Keywords

  • Flat plate boundary layer
  • Hot-wire anemometry
  • Leading edge pattern
  • Streamwise counter-rotating vortices

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