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TECHNICAL PAPERS

Turbulent Flow Structure in a Cylinder-on-Cone Cyclone

[+] Author and Article Information
W. O. Wong, X. W. Wang, Y. Zhou

Department of Mechanical Engineering,  The Hong Kong Polytechnic University, Hong Kong, People’s Republic of China

J. Fluids Eng 129(9), 1179-1185 (Apr 10, 2007) (7 pages) doi:10.1115/1.2754315 History: Received May 11, 2006; Revised April 10, 2007

Turbulent flow structure in a cylinder-on-cone cyclone was experimentally investigated. Measurements were conducted at a fixed geometrical swirl number. Experiments were performed at a swirl number of 3 and Reynolds numbers from 37,100 to 74,200, based on the inlet velocity and the cyclone body diameter. The flow field in planes normal to and through the cyclone axis was measured in detail using a two-component laser Doppler velocimetry (LDA) and a particle imaging velocimetry (PIV). Two dominant frequencies of vortical structures were identified based on LDA-measured tangential and axial velocity spectra. Although one of them agreed quite well with those in literature, the other was reported for the first time. One explanation was proposed.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) Experimental setup, (b) sketch of mean flow in the cyclone, and (c) top view of the cyclone

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Figure 2

Radial distribution of (a) mean tangential velocity V¯θ and (b) mean axial velocity V¯z in the (r, θ) plane (z∕R=1), Re=47,000

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Figure 3

Averaged velocity vectors in the (r,z)-plane of the cyclone chamber measured using PIV, Re=47,000 and S=3.0

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Figure 4

Radial distribution of (a)Vθ,rms and (b) Vz,rms in the (r, θ) plane (z∕R=1), Re=47,000

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Figure 5

Power spectral density functions of Vθ, measured along the axis X-X (Fig. 1) in the (r, θ) plane (z∕R=1), at various r∕R using LDA, Re=47,000

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Figure 6

Power spectral density functions of Vz measured along the axis X-X (Fig. 1) in the (r, θ) plane (z∕R=1), at various r∕R using LDA, Re=47,000

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Figure 7

Power spectral density functions of Vθ and Vz measured along the axis X-X (Fig. 1) in the (r, θ) plane (z∕R=1), at various r∕R using hot-wire anemometry, Re=47,000

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Figure 8

Strouhal numbers of the swirl flow in the present cyclone at four different Reynolds numbers

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Figure 9

Contours of PIV-measured instantaneous normalized vorticity in (r, z)-plane, Re=47,000 and S=3.0. The (r, θ) plane, where both PIV and LDA measurements were conducted, is marked by the dashed-dotted line.

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Figure 10

Averaged vorticity contours measured using PIV in the (r,z) plane of the cylinder chamber, Re=47,000 and S=3.0

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Figure 11

PIV-measured instantaneous vorticity contours in the (r, θ)-plane (z∕R=1), Re=47,000 and S=3.0

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Figure 12

Averaged vorticity contours in the (r, θ) plane (z∕R=1) measured using PIV, Re=47,000 and S=3.0

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