Abstract
The present paper presents time-resolved volumetric Particle Tracking Velocimetry measurements in a water towing tank on a SD7003 airfoil, performed at a Reynolds number of 60,000 and a 4° angle of attack. The SD7003 airfoil was chosen because of its long mid-chord and stable laminar separation bubble (LSB), occurring on the suction side of the airfoil at low Reynolds numbers. The present study focuses on the temporal resolution of unsteady large-scale vortex structures emitted from the LSB. In contrast to other studies, where only the observation of the flow in the transition region was examined, the entire flow from the leading edge to the far wake of the airfoil was investigated here.
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Alam M, Sandham ND (2000) Direct numerical simulation of “Short” laminar separation bubbles with turbulent reattachment. J Fluid Mech 410:1–28
Burgmann S, Dannemann J, Schröder W (2007) Time-resolved and volumetric PIV measurements of a transitional separation bubble on an SD7003 airfoil. Exp Fluids 44: 609–622
Burgmann S, Schröder W (2008) Investigation of the vortex induced unsteadiness of a separation bubble via time-resolved and scanning PIV measurements. Exp fluids 45: 675–691
Gaster M (1966) The structure and behaviour of laminar separation bubbles. AGARD CP-4, pp 813–854
Hain R (2009) Untersuchung der Dynamik laminarer Ablöseblasen mit der zeitaufgelösten particle image velocimetry. Ph.D. Thesis, Technical University Braunschweig
Hain R, Kähler CJ (2005) Advanced evaluation of time-resolved PIV image sequences. In: 6th International symposium on particle image velocimetry, Pasadena, 21–23 September
Hain R, Kähler CJ, Radespiel R (2009) Dynamics of laminar separation bubbles at low-Reynolds number aerofoils. J Fluid Mech 630:129–153
Horton H (1968) Laminar separation bubbles in two and three-dimensional incompressible flow. Ph.D. Thesis, Department of aeronautical engineering, Queen Mary College/University of London
Jeong J, Hussain F (1995) On the identication of a vortex. J Fluid Mech 285:69–94
Ol MV, Hanff E, McAuliffe B, Scholz U, Kähler CJ (2005) Comparison of laminar separation bubble measurements on a low Reynolds number airfoil in three facilities. In: 35th AIAA fluid dynamics conference and exhibit, Toronto, 6–9 June
Pauley LL, Moin P, Reynolds WC (1990) The structure of two-dimensional separation. J Fluid Mech 220:397–411
Pereira F, Gharib M, Dabiri D, Modarress D (2000) Defocusing digital particle image velocimetry: a 3-component 3-dimensional DPIV measurement technique. Application to bubbly flows. Exp Fluids Suppl S78–S84
Pereira F, Stuer H, Graff EC, Gharib M (2006) Two-frame 3D particle tracking. Meas Sci Technol 17:1680–1692
Spalart P, Strelets M (2000) Mechanisms of transition and heat transfer in a separation bubble. J Fluid Mech 403:329–349
Troolin DR, Longmire EK (2009) Volumetric velocity measurements of vortex rings from inclined exits. Exp Fluids 48:409–420
Watmuff JH (1999) Evolution of a wave packet into vortex loops in a laminar separation bubble. J Fluid Mech 397:119–169
Willert CE, Gharib M (1992) Three-dimensional particle imaging with a single camera. Exp Fluids 12:353–358
Yang Z, Voke PR (2001) Large-Eddy simulation of a boundary-layer separation and transition at a change of surface curvature. J Fluid Mech 439:305–333
Zhang W, Hain R, Kähler CJ (2008) Scanning PIV investigation of the laminar separation bubble on a SD7003 airfoil. Exp Fluids 45:725–743
Acknowledgments
The authors like to thank Prof. Münch and Mr. Banachowicz from the University of German Armed Forces Munich for providing the test facility and their technical support.
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Wolf, E., Kähler, C.J., Troolin, D.R. et al. Time-resolved volumetric particle tracking velocimetry of large-scale vortex structures from the reattachment region of a laminar separation bubble to the wake. Exp Fluids 50, 977–988 (2011). https://doi.org/10.1007/s00348-010-0973-2
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DOI: https://doi.org/10.1007/s00348-010-0973-2