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Lookup NU author(s): Dr Ali BakhshandehrostamiORCiD
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Springer Wien, 2019.
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This paper is devoted to considering the Strouhal number (St) of various geometries of a plate at different angles of attack (0∘0∘–90∘90∘), while the Reynolds number (ReRe) changes in a moderate range (between 2.8×1042.8×104 and 1.4×105)1.4×105). The considered geometries consist of a flat plate and a flapped plate. Two of its flaps make a cross section like a flattened S and are investigated with flap angles of 27∘27∘ and 55∘55∘. The frequency of vortex shedding is measured using two strain gauges mounted in X shape on the central axis of the plates. The experimental results have been corrected for blockage effect. Based on the results, St of the flat plate increases sharply from zero angles of attack up to 50∘50∘, and then reaches an almost constant value at higher angles. The experiments demonstrate that the flapped plate suppresses the vortex shedding at a certain range of angles of attack compared with the flat plate. Consequently, St of the flapped plate becomes smaller than in the case of the flat plate in this range. The effect of the flow regime in a channel on St of the flat plate is probed using different hydraulic Froude numbers relevant to subcritical, critical and supercritical regimes.This paper is devoted to considering the Strouhal number (St) of various geometries of a plate at different angles of attack (0∘–90∘), while the Reynolds number (Re) changes in a moderate range (between 2.8×104 and 1.4×105). The considered geometries consist of a flat plate and a flapped plate. Two of its flaps make a cross section like a flattened S and are investigated with flap angles of 27∘ and 55∘. The frequency of vortex shedding is measured using two strain gauges mounted in X shape on the central axis of the plates. The experimental results have been corrected for blockage effect. Based on the results, St of the flat plate increases sharply from zero angles of attack up to 50∘, and then reaches an almost constant value at higher angles. The experiments demonstrate that the flapped plate suppresses the vortex shedding at a certain range of angles of attack compared with the flat plate. Consequently, St of the flapped plate becomes smaller than in the case of the flat plate in this range. The effect of the flow regime in a channel on St of the flat plate is probed using different hydraulic Froude numbers relevant to subcritical, critical and supercritical regimes.
Author(s): Rostami AB, Amini MM, Fernandes AC
Publication type: Article
Publication status: Published
Journal: Acta Mechanica
Year: 2019
Volume: 230
Issue: 1
Pages: 333-349
Print publication date: 01/01/2019
Online publication date: 11/11/2018
Acceptance date: 20/09/2018
Date deposited: 15/11/2018
ISSN (print): 0001-5970
ISSN (electronic): 1619-6937
Publisher: Springer Wien
URL: https://doi.org/10.1007/s00707-018-2292-2
DOI: 10.1007/s00707-018-2292-2
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