Dynamic stall control by periodic excitation, Part 1: NACA 0015 parametric study

A parametric study was undertaken to investigate the effect of periodic excitation (with zero net mass e ux ) on a NACA0015airfoilundergoingpitchoscillationsatrotorcraftreducedfrequenciesunderincompressibleconditions. Theprimaryobjectiveofthestudywastomaximizeairfoilperformancewhilelimitingmomentexcursionstotypical prestalled conditions. The incidence angle excursions were limited to § 5 deg, and a wide range of reduced excitation frequencies and amplitudes were considered for 0 :33 10 6 < ‐ Re <‐ 0:93 10 6 with various e ap dee ections and excitation locations. Signie cant increases in maximum lift and reductions in drag were attained while containing themomentexcursions. Oscillatoryexcitation wasfoundto befarsuperiortosteadyblowing,which wasevendetrimental under certain conditions, and e ap-shoulder excitation was found to be superior to leading-edge excitation.

[1]  I. Wygnanski,et al.  Delay of Airfoil Stall by Periodic Excitation , 1996 .

[2]  M. Luttges,et al.  Control of unsteady separated flow structures on airfoils , 1985 .

[3]  L. Carr Progress in analysis and prediction of dynamic stall , 1988 .

[4]  M. S. Chandrasekhara,et al.  Transition effects on compressible dynamic stall of transiently pitching airfoils , 1993 .

[5]  K. W. McAlister,et al.  Suppression of Dynamic Stall by Steady and Pulsed Upper-Surface Blowing , 1998 .

[6]  Ahmed Hassan,et al.  Numerical simulations and potential applications of zero-mass jets for enhanced rotorcraft aerodynamic performance , 1998 .

[7]  Israel J Wygnanski,et al.  Dynamic Stall Control by Periodic Excitation, Part 2: Mechanisms , 2001 .

[8]  Ahsanul Karim,et al.  Suppression of dynamic-stall vortices over pitching airfoils by leading-edge suction , 1994 .

[9]  Israel J Wygnanski,et al.  Dynamic stall control by oscillatory forcing , 1998 .

[10]  I. Wygnanski,et al.  Sweep Effect on Parameters Governing Control of Separation by Periodic Excitation , 1998 .

[11]  Soogab Lee,et al.  Dynamic Stall Control for Advanced Rotorcraft Application , 1995 .

[12]  L. D. Krai,et al.  ACTIVE FLOW CONTROL APPLIED TO AN AIRFOIL , 1998 .

[13]  Israel J Wygnanski,et al.  Some factors affecting stall control with particular emphasis on dynamic stall , 1999 .

[14]  M. S. Chandrasekhara,et al.  Unsteady Stall Control Using Dynamically Deforming Airfoils , 1998 .

[15]  A. Seifert,et al.  Oscillatory Control of Separation at High Reynolds Numbers , 1999 .

[16]  K. Mcalister,et al.  The effect of a leading-edge slat on the dynamic stall of an oscillating airfoil , 1983 .

[17]  B. Nishri,et al.  The delay of turbulent boundary layer separation by oscillatory active control , 1989 .

[18]  Mukund Acharya,et al.  Controlled leading-edge suction for management of unsteady separation over pitching airfoils , 1996 .

[19]  Israel J Wygnanski,et al.  Parameters affecting dynamic stall control by oscillatory excitation , 1999 .

[20]  B. Nishri,et al.  Effects of Periodic Excitation on Turbulent Flow Separation from a Flap , 1998 .

[21]  I. Wygnanski,et al.  Oscillatory Blowing: A Tool to Delay Boundary-Layer Separation , 1993 .

[22]  Peter Freymuth,et al.  Toward dynamic separation without dynamic stall , 1988 .

[23]  John L. McCloud,et al.  Full-Scale Wind-Tunnel Tests of Blowing Boundary-Layer Control Applied to a Helicopter Rotor , 1960 .

[24]  Jamey Jacob,et al.  Active Control of Separation on a Wing with Oscillating Camber , 2002 .

[25]  W. Stepniewski,et al.  Rotary Wing Aerodynamics , 2022 .

[26]  Avi Seifert,et al.  Oscillatory Control of Shock-Induced Separation , 1998 .

[27]  M. S. Chandrasekhara,et al.  Boundary-layer-tripping studies of compressible dynamic stall flow , 1996 .