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A novel modeling approach for vortex generator jet flow separation control
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
KTH, School of Engineering Sciences (SCI), Mechanics, Turbulence. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-8692-0956
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-2711-4687
2012 (English)In: 50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2012, AIAA 2012-0742- p.Conference paper, Published paper (Refereed)
Abstract [en]

This contribution describes the development and evaluation of a new statistical modeling approach for active vortex generator jet (VGJ) flow control. Previous experiments from Technical University Braunschweig, Germany, and a previous evaluation of the experiments by the authors showed that the resulting experimental vortices can be represented by Lamb-Oseen vortices. Based on that, an analytical expression is derived for the maximum circulation V max for the VGJ vortex in terms of the VGJ diameter Φ VGJ, the jet to free stream velocity ratio A, as well as the VGJ pitch and skew angle α and β, respectively. Ymax is used for describing the additional vortex velocity field that is originating from the VGJ. The idea behind the statistical modeling approach is that the generated vortices are represented by their averaged velocity correlations, or vortex stresses, that are in turn added to the transport equations in a Reynolds stres turbulence model. The spanwise averaged vortex stresses are derived by computing the spanwise averaged second-order statisitcs of the flow field. These results are compared to the spanwise averaged vortex stresses from experiments and corresponding results from fully resolved computational fluid dynamics investigations.

Place, publisher, year, edition, pages
2012. AIAA 2012-0742- p.
Keyword [en]
Analytical expressions, Free-stream velocity, Jet flow, Lamb-Oseen vortex, Modeling approach, Reynolds, Second orders, Skew angles, Statistical modeling, Technical universities, Transport equation, Velocity correlations, Vortex generators, Vortex stress, Vortex velocity, Aerospace engineering, Computational fluid dynamics, Exhibitions, Experiments, Statistical methods, Transport aircraft, Turbulence models, Velocity, Vorticity, Vortex flow
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-118764DOI: 10.2514/6.2012-742Scopus ID: 2-s2.0-84873864151OAI: oai:DiVA.org:kth-118764DiVA: diva2:608101
Conference
50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 9 January 2012 through 12 January 2012, Nashville, TN
Note

QC 20130226

Available from: 2013-02-26 Created: 2013-02-26 Last updated: 2013-02-26Bibliographically approved

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Wallin, StefanJohansson, Arne V.

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