图书馆订阅: Guest
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
Get accessGet access

摘要

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.

Begell Digital Portal Begell 数字图书馆 电子图书 期刊 参考文献及会议录 研究收集 订购及政策 Begell House 联系我们 Language English 中文 Русский Português German French Spain