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Strouhal number of flat and flapped plate at various angles of attack and Reynolds numbers: experimental data

Lookup NU author(s): Dr Ali Bakhshandehrostami

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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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Abstract

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.


Publication metadata

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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