Evolution of vortex structures in an electromagnetically excited separated flow
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Time periodic wall parallel Lorentz forces have been used to excite the separated flow on the suction side of an inclined flat plate. Experiments for a Reynolds number of 104 and an angle of attack of α = 13° are reported. The controlled flow is characterised by a small number of relatively large scale vortices, which are related to the control mechanism. The influence of the main parameters, i.e. the excitation frequency, amplitude and wave form on the suction side flow structures was investigated by analysing time resolved particle image velocimetry (TR-PIV) measurements using continuous wavelet analysis for vortex detection and characterisation. Statistical analysis of the coherent structures of the flow was performed on a large amount of data samples.
Financial support from Deutsche Forschungsgemeinschaft (DFG) in frame of the Collaborative Research Centre (SFB) 609 is gratefully acknowledged.
- Adrian RJ (1996) Stochastic estimation of the structure of turbulent fields. In: Bonnet JP (ed) Eddy structure identification. Springer, New York, pp 145–195Google Scholar
- Bouras C, Nagib H, Durst F, Heim U (2000) Lift and drag control on a lambda wing using leading-edge slot pulsation of various wave forms. Bull Am Phys Soc 45(9):30Google Scholar
- Gad-el Hak M (2000) Flow control: passive, active, and reactive flow management. Cambridge University Press, LondonGoogle Scholar
- Gailitis A, Lielausis O (1961) On a possibility to reduce the hydrodynamic resistance of a plate in an electrolyte. Appl Magnetohydrodyn Rep Phys Inst 12:143–146 (in Russian)Google Scholar
- Grienberg E (1961) On determination of properties of some potential fields. Appl Magnetohydrodyn Rep Phys Inst 12:147–154 (in Russian)Google Scholar
- Likhanskii AV, Shneider MN, Macheret SO, Miles RB (2007) Modeling of dielectric barrier discharge plasma actuators driven by repetitive nanosecond pulses. Phys Plasmas 14 (Article No. 073501)Google Scholar
- Raffel M, Willert C, Kompenhans J (1998) Particle image velocimetry, a practical guide. Springer, BerlinGoogle Scholar
- Rice W (1961) Propulsion system. US Patent 2,997,013Google Scholar
- Schram C (2002) Application of wavelet transform in vortical flows. In: VKI LS 2002-04, post-processing of experimantal and numerical data, von Karman Institute for Fluid Dynamics, BelgiumGoogle Scholar
- Sutton G, Sherman A (1965) Engineering magnetohydrodynamics. McGraw Hill, New YorkGoogle Scholar
- Weier T (2005) Elektromagnetische Strömungskontrolle mit wandparallelen Lorentzkräften in schwach leitfähigen Fluiden. PhD thesis, Technische Universität Dresden, Fakultät MaschinenwesenGoogle Scholar
- Weier T, Fey U, Gerbeth G, Mutschke G, Lielausis O, Platacis E (2001) Boundary layer control by means of wall parallel Lorentz forces. Magnetohydrodynamics 37(1/2):177–186Google Scholar