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Eighth International Symposium on Turbulence and Shear Flow Phenomena
August, 28-30, 2013, Poitiers, Futuroscope, France

DOI: 10.1615/TSFP8

INFLUENCE OF ANGLE OF ATTACK ON SYNTHETIC JET EFFECTIVENESS AS FOUND WITH COEFFICIENT OF MOMENTUM

pages 1-6
DOI: 10.1615/TSFP8.1200
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要約

The influence of periodic excitation from a synthetic jet actuator on the flow separation over a NACA 0025 airfoil at an angle of attack of 10° was investigated. Experiments were performed in a low-speed wind tunnel at a chord-based Reynolds number Rec = 105. At Rec = 105, the boundary layer separates and fails to reattach at angles of attack from 0 − 10°. When the boundary layer was forced at a momentum coefficient Cµ = 2.47 × 10−2 and excitation frequency fe = 970 Hz, the vortex shedding associated with the uncontrolled case was eliminated and the drag coefficient was reduced by 22%. These results were compared to previous work at α = 5° on the same airfoil by Goodfellow et al. (2012), who found that a drag reduction of 52% was achieved at Cµ = 3.09 × 10−3. The results suggest that as the angle of attack is increased from 5° to 10°, the synthetic jet actuator must transfer more momentum to the separated boundary layer in order to cause drag reduction.

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