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>Frequency response of near-wall coherent structures to localized periodic blowing and suction in turbulent boundary layer
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Frequency response of near-wall coherent structures to localized periodic blowing and suction in turbulent boundary layer
We experimentally investigate the frequency response of near-wall coherent structures to localized periodic blowing and suction through a spanwise slot in a turbulent boundary layer by changing the frequency of periodic disturbance at similar velocities of free stream. The effects of blowing and suction disturbance on energy redistribution, turbulent intensity u(rms)('+) over y(+) and waveforms of phase-averaged velocity during sweeping process are respectively discussed under three frequencies of periodic blowing and suction in near-wall region of turbulent boundary layer, compared with those in a standard turbulent boundary layer. The most effective disturbance frequency is figured out in this system.
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