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Comparison of the unsteady loads of an airfoil in the pitching and plunging motions

Soltani, M ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: 10.1115/fedsm2006-98482
  3. Publisher: American Society of Mechanical Engineers , 2006
  4. Abstract:
  5. A series of experiments were conducted on an oscillating airfoil in subsonic flow. The model was oscillated in two types of motions, pitch and plunge, at different velocities, and reduced frequencies. In addition, steady data were acquired and examined to furnish a baseline for analysis and comparison. The imposed variables of the experiment were reduced frequency, mean incident angle, amplitude of motion, and free stream velocity as well as the surface grit roughness. The unsteady aerodynamic loads were calculated using surface pressure measurements, 64 ports, along the chord for both upper and lower surfaces of the model. Particular emphases were placed on the effects of different type of motion on the unsteady aerodynamic loads of the airfoil at pre-stall, near stall, and post stall conditions. Variations of the aerodynamic coefficients with equivalent angle of attack for both pitching and plunging motions showed strong sensitivity to the reduced frequency, oscillation amplitude, Reynolds number, and mean angles of attack. Copyright © 2006 by ASME
  6. Keywords:
  7. Aerodynamic loads ; Pressure measurement ; Reynolds number ; Subsonic flow ; Surface roughness ; Aerodynamic coefficients ; Pitching ; Stream velocity ; Surface pressure measurement ; Airfoils
  8. Source: 2006 ASME Joint U.S.- European Fluids Engineering Division Summer Meeting, FEDSM2006, Miami, FL, 17 July 2006 through 20 July 2006 ; Volume 2 FORUMS , 2006 , Pages 977-985 ; 0791847500 (ISBN); 9780791847503 (ISBN)
  9. URL: https://asmedigitalcollection.asme.org/FEDSM/proceedings-abstract/FEDSM2006/47519/977/318942