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TECHNICAL PAPERS

Analysis of the Immediate Boundary Conditions of an Axial Flow Impeller

[+] Author and Article Information
David A. Johnson

Department of Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1

J. Fluids Eng 123(4), 771-779 (Aug 08, 2001) (9 pages) doi:10.1115/1.1412846 History: Received December 14, 2000; Revised August 08, 2001
Copyright © 2001 by ASME
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References

Figures

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Impeller configuration- one of three equally spaced blades shown
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Experimental configuration all dimensions referenced to the impeller diameter D (0.152 m)
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Average velocities Vr* and Vy* in control volume ReD=77,000 ▴LDA measurements • PIV measurements dashed line indicates location of measurements. Blade schematic included for reference.
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Average tangential velocities vs R*,Vθ* inlet at Y*=0.167 (▪ PIV-inlet) and exit at Y*=−0.083 (▴ LDA measurements • PIV measurements), ReD=77,000
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RMS velocities νr* and νy* in control volume ReD=77,000 ▴ LDA measurements • PIV measurements Dashed line indicates location of measurements. Blade schematic included for reference.
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RMS velocity components (−) vs R* at Y*=−0.083 (▴ νr*, ▪ νθ* and ♦ νy* and kinetic energy k* •) ReD=77,000
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Measured Reynolds stresses (m2 /s2 ) versus R* at Y*=−0.083ReD=77,000 (♦ vrvy and ▪ vθvy)
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Integral time scales (s) in r, θ, y directions versus R* at Y*=−0.083ReD=77,000 (▪ radial, ▴ tangential, ♦ axial)
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Integral length scales (−) in r, θ, y directions versus R* at Y*=−0.083ReD=77,000 (▪ radial, ▴ tangential, ♦ axial)
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Taylor time scales (s) in r, θ, y directions versus R* at Y*=−0.083ReD=77,000 (▪ radial, ▴ tangential, ♦ axial)
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Taylor length scales (−) in r, θ, y directions versus R* at Y*=−0.083ReD=77,000 (▪ radial, ▴ tangential, ♦ axial)
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Dissipation ε (m2 /s3 ) versus R* at Y*=−0.083ReD=77,000 utilizing four methods (▪ Eq. (8), ♦ Eq. (9), ▴ Eq. (10), x equation (11))
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Dimensionless averaged velocities and contours of k2*,r−θ plane at Y*=−0.083 (looking in +y direction) blade located at vertical R* axis rotating counterclockwise triggered PIV data ReD=77,000 dimensionless reference vector 0.25
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Dimensionless averaged velocities and contours of k2*x−y plane at R*=0.41 blade moving to the left of figure triggered PIV data ReD=77,000 dimensionless reference vector 0.25
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Dimensionless averaged velocities r−y plane at θ=30° after blade passage (blade moving out of page) triggered PIV data ReD=77,000 Dimensionless reference vector 0.25
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Contours of k2*r−y plane at θ=30° after blade passage (blade moving out of page) triggered PIV data ReD=77,000

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