Abo Bibliothek: Guest
Second Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2001, KTH, Stockholm, Sweden

DOI: 10.1615/TSFP2

A QUASI-RANDOM PHASE CONTROL AS A NEW OPEN-LOOP ACTIVE CONTROL METHOD

pages 181-186
DOI: 10.1615/TSFP2.300
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ABSTRAKT

The objective of the present study is to increase mixing in turbulent flows behind a backward-facing step and downstream of a jet exit using a newly-developed quasi-random phase (QRP) control method. In this method, spatially sinusoidal but temporally varying blowing and suction with zero-net mass flux are provided at the edge of the backward-facing step and the jet exit. Large eddy simulations are conducted for both flows. It is shown that the velocity and vorticity fluctuations substantially increase downstream of the QRP control, indicating significant increases in mixing behind the backward-facing step and downstream of the jet exit. The results of the QRP control are compared with those of single frequency actuation and spatially sinusoidal blowing/suction (stationary in time or moving at a constant phase speed in the span-wise/azimuthal direction), showing the largest mixing in the case of QRP control.

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