Wingtip vortex modifications using alternating jets

Richard Kranepuhl, Sergey V Shkarayev, Pascal Planchenault

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

The safe reduction of separation distance between airplanes can be achieved by modifying the wingtip vortices. Modifications in a near-field wake by using spanwise jets were studied on a NACA 0012 wing model. Experiments were conducted in the wind tunnel at 15 m/s and at an angle of attack of 7.5 degrees. Two chambers were integrated in the interior of the wing model with two angled jet slots in the wingtip. The jets pulsed at 10 Hz. The jet velocity distribution was quantified with the help of a hot-wire anemometry and 2D PIV. In order to investigate the evolution of wingtip vortex, the phase-locked 2D PIV measurements were conducted at 5 streamwise stations. Studies include the baseline case, steady and pulsed jet blowing on the pressure and suction sides, and alternating phase-shifted blowing of two jets. Spanwise blowing jets displace wingtip vortices upward and outward from the wing tip. Under the pulsed blowing, the vortex center oscillates along the line inclined to the horizontal. When advecting downstream, the vortex is moving in a spiral trajectory rotating in the direction of the baseline vortex rotation. Experiments revealed that the maximum circulation decreases and core size increases downstream under pulsed blowing.

Original languageEnglish (US)
Title of host publication34th AIAA Applied Aerodynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624104374
DOIs
StatePublished - Jan 1 2016
Event34th AIAA Applied Aerodynamics Conference, 2016 - Washington, United States
Duration: Jun 13 2016Jun 17 2016

Publication series

Name34th AIAA Applied Aerodynamics Conference

Other

Other34th AIAA Applied Aerodynamics Conference, 2016
CountryUnited States
CityWashington
Period6/13/166/17/16

Keywords

  • Circulation
  • Jet
  • Trajectory
  • Vortex
  • Wingtip

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering

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  • Cite this

    Kranepuhl, R., Shkarayev, S. V., & Planchenault, P. (2016). Wingtip vortex modifications using alternating jets. In 34th AIAA Applied Aerodynamics Conference (34th AIAA Applied Aerodynamics Conference). American Institute of Aeronautics and Astronautics Inc, AIAA. https://doi.org/10.2514/6.2016-3118