Experiments in Fluids

, 54:1492 | Cite as

Flow control for aero-optics application

  • B. Vukasinovic
  • A. Glezer
  • S. Gordeyev
  • E. Jumper
  • W. W. Bower
Research Article
Part of the following topical collections:
  1. Topics in Flow Control


The mitigation of aero-optical aberrations in the wake of a surface-mounted turret comprised of a hemisphere mounted on a matching cylindrical support is investigated in wind tunnel experiments. The effects of hybrid (passive/active) flow control on the aero-optical and aerodynamic characteristics of the flow over a conformal optical aperture embedded in the hemispherical cap are investigated at M = 0.3 and Re D = 4.46 × 106. Direct optical diagnostics of 2D wavefronts over the aperture is performed using a high-speed Shack-Hartmann wavefront sensor for a range of aperture orientations on and off the streamwise center plane. Aerodynamic flow diagnostics includes arrays of static and dynamic pressure ports on the turret and the ground plane that help characterize flow separation and the wake topology. The global flow is passively controlled by a forward-facing partition plate that increases the flow receptivity to and the effectiveness of arrays of high-frequency fluidic oscillating jets that are placed upstream of the aperture. It is shown that the hybrid flow control yields significant improvements in the aero-optical characteristics of the flow over the aperture that exceeds the individual effects of passive and active control.


Elevation Angle Optical Aberration Active Flow Control Wavefront Sensor Baseline Flow 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols


Exit area of the actuator orifice


Frontal turret area


Pressure coefficient


Mass flow rate coefficient


Turret diameter




Freestream Mach number


Optical path difference


Spatial root-mean-square of OPD


Turret radius


Optical aperture radius


Reynolds number


Strouhal number


Freestream velocity


Average jet velocity


Height of turret base


Elevation angle of optical aperture


Azimuthal angle of optical aperture


Boundary layer thickness


Local azimuth angle of pressure ports


Air density


Sea-level air density



This work has been supported by the Air Force Research Laboratory, Air Vehicle Directorate, WPAFB, OH and the Boeing Company. Support by the AFRL program manager Donnie Saunders and SARL-tunnel personnel is greatly appreciated.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • B. Vukasinovic
    • 1
  • A. Glezer
    • 1
  • S. Gordeyev
    • 2
  • E. Jumper
    • 2
  • W. W. Bower
    • 3
  1. 1.Woodruff School of Mechanical EngineeringGeorgia Institute of TechnologyAtlantaUSA
  2. 2.Department of Aerospace and Mechanical EngineeringUniversity of Notre DameNotre DameUSA
  3. 3.The Boeing CompanySaint LouisUSA

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