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Effect of reduced frequency on the aerodynamic behavior of an airfoil oscillating in a plunging motion

Soltani, M. R ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. Publisher: 2009
  3. Abstract:
  4. A series of low speed wind tunnel tests were conducted to study the unsteady aerodynamic behavior of an airfoil sinusoidally oscillating in plunge. The experiments included measuring the surface pressure distribution over a range of reduced frequencies, k = 0.03 - 0.06. In addition, steady state data were acquired and were used to furnish a baseline for further analysis and comparison. The model was oscillated with amplitude of ±15 cm and at three different mean angles of attack of 0, 10° and 18°. The unsteady aerodynamic loads were calculated from the surface pressure measurements, 64 ports, along the chord for both upper and lower surfaces. The plunging displacements were transformed into the equivalent angle of attack. Variations of the pressure coefficients and aerodynamic loads with the equivalent angle of attack showed strong sensitivity to the reduced frequency and mean angles of attack. © Sharif University of Technology, February 2009
  5. Keywords:
  6. Airfoil ; Hysteresis loop ; Plunging ; Reduced frequency ; Aerodynamic loads ; Angle of attack ; Gas dynamics ; Hysteresis ; Magnetic materials ; Pressure measurement ; Sensitivity analysis ; Tunnels ; Wind tunnels ; Angles of attacks ; Low-speed wind tunnels ; Pressure coefficients ; Steady-state datum ; Surface pressure distributions ; Unsteady aerodynamic ; Unsteady aerodynamic loads ; Airfoils ; Aerodynamics ; Experimental study ; Loading ; Testing method ; Unsteady flow ; Wind tunnel ; Wind velocity ; Angles of attack ; Low-speed wind tunnel ; Steady state data ; Surface pressure distribution ; Surface pressure measurements ; Unsteady aerodynamic load ; Unsteady aerodynamics
  7. Source: Scientia Iranica ; Volume 16, Issue 1 , 2009 , Pages 40-52 ; 10263098 (ISSN)
  8. URL: http://scientiairanica.sharif.edu/article_2996.html