Flow separation control over a Gö 387 airfoil by nanosecond pulse-periodic discharge

Kentaro Kato, Christian Breitsamter, Shinnosuke Obi

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Airfoil flow separation control using plasma actuator driven by repetitive nanosecond pulse voltage was experimentally investigated. The pressure distribution on an airfoil surface was measured by means of a liquid manometer, which is free from electromagnetic interference of the plasma. By integrating the pressure distribution, the lift coefficient was computed and the effects of the input voltage amplitude and repetitive frequency were evaluated. The results show two different manners of the lift increment depending on the angle of attack. At the pre-stall and stall angle, the flow is steady and the lift increment does not depend on the frequency. A strong hysteresis effect is also observed, i.e., once the lift increases due to the plasma actuation, it is still increased even after the actuation stops. At the post-stall angle, the flow is unsteady and the lift increment becomes significant with actuation at frequencies related to inherent flow instabilities for the shear layer and wake, which are determined by the spectrum analysis based on hot-wire measurements. At the preference frequency ranges, there is a certain voltage amplitude depending on the angle of attack, at which the extended plasma layer results in an optimum increase of lift.

Original languageEnglish
Article number1795
JournalExperiments in Fluids
Volume55
Issue number8
DOIs
Publication statusPublished - 2014

Fingerprint

flow separation
Flow separation
airfoils
Airfoils
actuation
pulses
angle of attack
Plasmas
pressure distribution
Angle of attack
electric potential
Pressure distribution
Electric potential
lift coefficients
manometers
plasma layers
plasma control
electromagnetic interference
Manometers
unsteady flow

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes
  • Computational Mechanics
  • Mechanics of Materials

Cite this

Flow separation control over a Gö 387 airfoil by nanosecond pulse-periodic discharge. / Kato, Kentaro; Breitsamter, Christian; Obi, Shinnosuke.

In: Experiments in Fluids, Vol. 55, No. 8, 1795, 2014.

Research output: Contribution to journalArticle

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