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

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

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.]

原文English
頁(從 - 到)359-367
頁數9
期刊Journal of Visualization
19
發行號3
DOIs
出版狀態Published - 1 八月 2016

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