Measurements of circular cylinder's wake using time-resolved PIV

Wang Yong; Hao Nansong; Geng Zihai; Wang Wanbo

doi:10.11729/syltlx20170099

Volume 32 Issue 1

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Journal of Experiments in Fluid Mechanics > 2018 > 32(1): 64-70. > DOI: 10.11729/syltlx20170099

Wang Yong, Hao Nansong, Geng Zihai, Wang Wanbo. Measurements of circular cylinder's wake using time-resolved PIV[J]. Journal of Experiments in Fluid Mechanics, 2018, 32(1): 64-70. DOI: 10.11729/syltlx20170099

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Measurements of circular cylinder's wake using time-resolved PIV

1.
State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China
2.
Key Laboratory of Aerodynamic Noise Control, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China

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Received Date: August 01, 2017
Revised Date: November 19, 2017

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Abstract

Abstract

Time-resolved particle image velocimetry (PIV) with sampling frequency f=1000Hz was used in 0.55m×0.4m aeroacoustic wind tunnel to test the unsteady characteristics of the flow behind a D=20mm diameter circular cylinder in an area of 7.5 times the diameter long and 6.6 times the diameter wide at Reynolds numbers of 2.74×10⁴.The characteristics of the mean and pulsating flow fields, as well as the frequency characteristics of the cylinder's wake have been revealed.A phase-averaged analysis method based on the cross-correlation coefficients among the PIV velocity vectors has been proposed to capture the process of vortex production, shedding, development and dissipation.The results indicate that there exists a low-speed recirculated flow area behind the circular cylinder, where the flow structure changes most intensively.The vortices shed from the upper and lower sides of the circular cylinder cross and correlate around the 1.9D downstream area, where the turbulence is the strongest.Strouhal number corresponding to the vortex shedding frequency of the cylinder's wake is stable around 0.2.The proposed phase-averaged analysis method is simple but efficient to study the spatial-temporal evolutions of the vortex shedding, which can be easily applied to other areas in unsteady flow field measurement.
- cylinder's wake,
- time-resolved PIV,
- wake characteristic,
- phase-averaged analysis,
- frequency characteristic

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