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Thermophysics and Aeromechanics

, Volume 23, Issue 5, pp 639–643 | Cite as

Flow control of the semicircular airfoil with a vortex cell at slot suction of air and its blowout into the near wake

  • S. A. IsaevEmail author
  • P. A. Baranov
  • M. Yu. Smurov
  • A. G. Sudakov
  • A. V. Shebelev
Article

Abstract

In the vicinity of a semicircular airfoil with slot suction of air provided with a 0.2-diameter (chord) vortex cell installed on the backside of the wing, at low speeds and zero angle of attack the pattern of the unsteady separated air-flow undergoes substantial changes, those changes being accompanied with the displacement of flow separation point toward the trailing edge. The slot suction of air and its blowout into the near wake in such an airfoil is organized using a discharge channel with a fan; from this channel, the air jet is discharged into atmosphere tangentially to the airfoil base, with the pressure drop in the fan being equal to twice the pressure head. Under such conditions, the integral force characteristics of the wing show dramatic changes: the lift force, initially being ultra-low negative, becomes positive, and the drag decreases two-fold. The static pressure decreases by two or three times on the upper arch of the profile, and it increases by two times on the lower part of the airfoil, the level of pressure pulsations decreasing by more than ten times.

Keywords

vortex cell semicircular airfoil suction fan multi-block computer technologies modified MSST 

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Copyright information

© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  • S. A. Isaev
    • 1
    Email author
  • P. A. Baranov
    • 1
  • M. Yu. Smurov
    • 1
  • A. G. Sudakov
    • 1
  • A. V. Shebelev
    • 1
  1. 1.St.-Petersburg State University of Civil AviationSt. PetersburgRussia

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