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Flow, Turbulence and Combustion
Erschienen in: Flow, Turbulence and Combustion 2/2017

19.09.2016

Experimental Investigation of Three-Dimensional Vortex Structures Downstream of Vortex Generators Over a Backward-Facing Step

verfasst von: Xingyu Ma, Reinhard Geisler, Andreas Schröder

Erschienen in: Flow, Turbulence and Combustion | Ausgabe 2/2017

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Abstract

An experimental investigation of vortex generators has been carried out in turbulent backward-facing step (BFS) flow. The Reynolds number, based on a freestream velocity U0 = 10 m/s and a step height h = 30 mm, was Reh = 2.0 × 104. Low-profile wedge-type vortex generators (VGs) were implemented on the horizontal surface upstream of the step. High-resolution planar particle image velocimetry (2D-2C PIV) was used to measure the separated shear layer, recirculation region and reattachment area downstream of the BFS in a single field of view. Besides, time-resolved tomographic particle image velocimetry (TR-Tomo-PIV) was also employed to measure the flow flied of the turbulent shear layer downstream of the BFS within a three-dimensional volume of 50 × 50 × 10 mm3 at a sampling frequency of 1 kHz. The flow control result shows that time-averaged reattachment length downstream of the BFS is reduced by 29.1 % due to the application of the VGs. Meanwhile, the Reynolds shear stress downstream of the VGs is considerably increased. Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD) have been applied to the 3D velocity vector fields to analyze the complex vortex structures in the spatial and temporal approaches, respectively. A coherent bandwidth of Strouhal number 0.3 < Sth < 0.6 is found in the VG-induced vortices, and moreover, Λ-shaped three-dimensional vortex structures at Sth = 0.37 are revealed in the energy and dynamic approaches complementarily.
Vorheriger Artikel Helical Structures in the Near Field of a Turbulent Pipe Jet
Nächster Artikel Numerical Analysis of the Impact of the Interior Nozzle Geometry on Low Mach Number Jet Acoustics

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Metadaten
Titel
Experimental Investigation of Three-Dimensional Vortex Structures Downstream of Vortex Generators Over a Backward-Facing Step
verfasst von
Xingyu Ma
Reinhard Geisler
Andreas Schröder
Publikationsdatum
19.09.2016
Verlag
Springer Netherlands
Erschienen in
Flow, Turbulence and Combustion / Ausgabe 2/2017
Print ISSN: 1386-6184
Elektronische ISSN: 1573-1987
DOI
https://doi.org/10.1007/s10494-016-9768-8

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