Streamwise counter-rotating vortices generated by triangular leading edge pattern in flat plate boundary layer

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Abstract: A series of flow visualizations were conducted to qualitatively study the development of streamwise counter-rotating vortices over a flat plate induced by triangular patterns at the leading edge of a flat plate. The experiments were carried out for a Reynolds number based on the pattern wavelength (λ) of 3080. The results depict the onset, development and breakdown of the vortical structures within the flat plate boundary layer. Moreover, the effect of one spanwise array of holes with diameter of 0.2λ (=3 mm) was examined. This investigation was done on two different flat plates with holes placed at the location x/λ = 2 downstream of the troughs and peaks. The presence of holes after troughs does not show any significant effect on the vortical structures. However, the plate with holes after peaks noticeably delays the vortex breakdown. In this case, the “mushroom-like” vortices move away from the wall and propagate downstream with stable vortical structures. The vortex growth is halted further downstream but start to tilt aside. Graphical abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)359-367
Number of pages9
JournalJournal of Visualization
Volume19
Issue number3
DOIs
StatePublished - 1 Aug 2016

Keywords

  • Flat plate boundary layer
  • Leading edge pattern
  • Smoke-wire flow visualization
  • Streamwise counter-rotating vortices

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