Investigation of Periodic Pitching through the Static Stall Angle of Attack.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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The flow over an NACA 0015 airfoil undergoing periodic pitching motions using constant pitch rate ramps was experimentally stuided over a range of pitch rates and angles of attack. Surface pressure transducers coupled with a microcomputer-based data acquistion system were used to collect surface pressure data a rate of 4000 samples per second. The data was reduced through numerical integration of the pressure data to provide graphs of the coefficients of lift, pressure drag and pitching moment versus time. Each point on the graphs represents an average of five runs. The results were compared according to their nondimensional pitch rates defined as the product of one-half the chord length and the pitch rate divided by the freestream velocity. Data was collected in the range of nondimensional pitch up rates between 0.104 and 0.384 and the range of angles of attack between 0 and 30 degrees. Keywords Dynamic stall. Theses.
- Fluid Mechanics