Effects of periodic blowing from spanwise slot on a turbulent boundary layer

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Direct numerical simulations were performed to analyze the effects of time-periodical blowing through a span-wise slot on a turbulent boundary layer. The blowing velocity was varied in a cyclic manner from 0 to 2A(+) (A(+) = 0.25, 0.50, and 1.00) at a fixed blowing frequency of f(+) = 0.017. The effect of steady blowing (SB) was also examined, and the SB results were compared with those for periodic blowing (PB). PB reduced the skin friction near the slot, although to a slightly lesser extent than SB. PB was found to generate a spanwise vortical structure in the downstream of the slot. This vortex generates a reverse flow near the wall, thereby reducing the wall shear stress. The wall-normal and spanwise turbulence intensities under PB are increased as compared to those under SB, whereas the streamwise turbulent intensity under PB is weaker than that under SB. PB enhances more energy redistribution than SB. The periodic response of the streamwise turbulence intensity to PB is propagated to a lesser extent than that of the other components of the turbulence intensities and the Reynolds shear stress.
Publisher
AMER INST AERONAUT ASTRONAUT
Issue Date
2003-10
Language
English
Article Type
Article
Keywords

NUMERICAL-SIMULATION; DRAG REDUCTION; CHANNEL FLOW; VELOCITY; SUCTION; INJECTION; VORTICITY

Citation

AIAA JOURNAL, v.41, no.9, pp.1916 - 1924

ISSN
0001-1452
URI
http://hdl.handle.net/10203/13549
Appears in Collection
ME-Journal Papers(저널논문)
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