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Oscillation of Vortex Breakdown Location and Blowing Control of Time-Averaged Location

2000; American Institute of Aeronautics and Astronautics; Volume: 38; Issue: 5 Linguagem: Inglês

10.2514/2.1059

1533-385X

Anthony Mitchell, Didier Barberis, Pascal Molton, Jean Délery,

Aerodynamics and Acoustics in Jet Flows

Abstract : The goal of this research is the control of leading-edge vortex breakdown location utilizing along-the-core blowing near the apex on the leeward surface of sharp-edged, slender, delta wings at high angles of attack. In the S2Ch subsonic wind tunnel at ONERA Chalais Meudon, two delta wing models with 70-deg sweep angles and root chords of 950 mm have been configured to collect qualitative and quantitative surface and flowfield data. First, an examination of the streamwise, time-dependent oscillation of the leading-edge vortex breakdown locations without active flow control is presented. These results further the understanding of the vortex breakdown phenomena and provide a more precise basis for evaluating the effectiveness of various flow control methods. Second, open-loop blowing along one of the vortex cores on the leeward surface of the delta wing demonstrates the ability to displace downstream the controlled, time-averaged, vortex breakdown location by 20% of the root chord.