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Research Papers: Fundamental Issues and Canonical Flows

An Experimental Investigation of the Surface Pressure Fluctuations for Round Cylinders

[+] Author and Article Information
R. Maryami

School of Mechanical Engineering,
Yazd University,
Yazd 8915818411, Iran
e-mail: r.maryami@gmail.com

M. Azarpeyvand

Department of Mechanical Engineering,
University of Bristol,
Bristol BS8 1TR, UK
e-mail: m.azarpeyvand@bristol.ac.uk

A. A. Dehghan

School of Mechanical Engineering,
Yazd University,
Yazd 8915818411, Iran
e-mail: adehghan@yazd.ac.ir

A. Afshari

School of Mechanical Engineering,
Yazd University,
Yazd 8915818411, Iran
e-mail: afshar.abbas@gmail.com

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received May 11, 2018; final manuscript received November 11, 2018; published online December 24, 2018. Assoc. Editor: Jun Chen.

J. Fluids Eng 141(6), 061203 (Dec 24, 2018) (11 pages) Paper No: FE-18-1285; doi: 10.1115/1.4042036 History: Received May 11, 2018; Revised November 11, 2018

An experimental study is carried out to investigate the unsteady pressure exerted on the surface of a round cylinder in the subcritical Reynolds number range. Results are presented for the surface pressure fluctuations, spanwise coherence, lateral correlation length, and peripheral coherence. Discussions are provided for the dominance of the first three vortex shedding tones at different regions of the cylinder and the size of the flow structures around the cylinder. The dataset provided have shed new light on the unsteady aerodynamic loading acting on cylinders and provides the impetus for further research on the aerodynamics and aeroacoustics of bluff bodies.

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Figures

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Fig. 1

(a) The geometry of the contraction nozzle and the experimental setup and (b) the sensing area on the cylinder equipped with static pressure taps and spanwise and peripheral pressure transducers

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Fig. 2

In situ boundary layer surface pressure measurement using a pressure transducer installed under a pinhole

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Fig. 3

Schematic of the calibrator system used for the calibration of the in situ pressure transducers in the pinhole configuration

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Fig. 4

Amplitude and phase of the transfer function for a Panasonic WM-61A pressure transducer

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Fig. 5

Pressure coefficient at different peripheral locations. Symbols: present study; lines: prior studies.

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Fig. 6

Surface pressure PSD measured at different angular positions at Re=30×103: (a) PSD results for pressure transducers between θ=0deg and 90deg, (b) PSD results for pressure transducers between θ=90deg and 180deg, and (c) counter map of the surface pressure PSD over the circumference of the cylinder

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Fig. 7

Variation of the surface pressure power spectral amplitude at the fundamental vortex shedding frequency (f0), the first harmonic (f1=2f0), and the second harmonic (f2=3f0). The hollow markers are used when the tones are not visible and the values are taken from the broadband spectra at the selected frequencies.

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Fig. 8

Lateral coherence measured between two pressure transducers with a separation distance of ηz/D=0.68 at different angular position at Re=30×103: (a) lateral coherences for θ=0-90deg,(b) lateral coherences for θ=90-180deg, and (c) contour map of the lateral coherence around the cylinder

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Fig. 9

Amplitude of the coherence between two lateral pressure transducers with the spanwise spacing of ηz/D=0.68 at different angular position at Re=30×103at the fundamental vortex shedding frequency (f0), the first (f1=2f0) and second (f2=3f0) harmonics

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Fig. 10

Lateral coherence measured between several spanwise locations at different angular positions at Re=30×103

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Fig. 11

Lateral coherence measured on a circular cylinder model between spanwise microphones p1 to p8 for Re=30×103 at different angular positions. Data are fitted with a Gaussian function (exp(−a(ηz/D)2)), shown as the solid lines. (a) Fundamental vortex shedding frequency (f0), (b) first harmonic (f1), and (c) second harmonic (f2).

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Fig. 12

Frequency-dependent spanwise length-scales of the surface pressure fluctuations at different angular position

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Fig. 13

Peripheral coherence measured around the circular cylinder model at Re=30×103

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Fig. 14

Autocorrelation coefficient measured at different angular position at Re=30×103. Data are fitted with a Laplacian function (dash line) at angles of θ=45deg,90deg,and 135deg: (a) surface pressure autocorrelation within θ=0-90deg, (b) surface pressure autocorrelation within θ=90-180deg,and (c) counter map of the surface pressure autocorrelation coefficient around the cylinder.

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