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TECHNICAL PAPERS

Experimental Investigation of Unsteady Flow Field Within a Two-Stage Axial Turbomachine Using Particle Image Velocimetry

[+] Author and Article Information
Oguz Uzol, Yi-Chih Chow, Joseph Katz, Charles Meneveau

Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218

J. Turbomach 124(4), 542-552 (Nov 07, 2002) (11 pages) doi:10.1115/1.1509077 History: Received December 14, 2001; Online November 07, 2002
Copyright © 2002 by ASME
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References

Figures

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Test section of the axial turbomachine; the 2nd-stage rotors and stators are made of transparent acrylic
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Phase-averaged velocity in the stator frame of reference (|V̄s|⃗) and turbulent kinetic energy (k) at two rotor phases covering the entire 2nd stage. Utip=8 m/s is the blade tip velocity at 500 rpm, Ls=203 mm is the stage length and x=0 is the rotor leading edge. Arrow shows the rotor direction.
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Matched sets of phase averaged absolute velocity (|V̄s|⃗) and turbulent kinetic energy (k) consisting of, from bottom to top, phase 10 (t/TR=0.9), phase 3 (t/TR=0.2) and phase 6 (t/TR=0.5). Arrow shows the rotor direction.
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(a) Phase-averaged velocity in the rotor frame of reference (|V̄R|⃗); (b) turbulent kinetic energy; (c) phase-averaged flow angle (ᾱR) in the rotor frame of reference around the rotor blade for two different stator phases
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Sample comparisons between measured (t/TR=0.6 and 0.7) and interpolated (t/TR=0.625, 0.650 and 0.675) phase-averaged axial velocity profiles in the rotor wake (x/Ls=0.161)
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(a) Distributions of average passage velocity magnitude (|V⁁s|⃗), deterministic kinetic energy (kdetS) and deterministic shear stress (τ12S det) in the stator frame of reference; (b) distributions of average passage velocity magnitude (|V⁁R|⃗), deterministic kinetic energy (kdetR) and deterministic shear stress (τ12R det) in the rotor frame of reference
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Comparisons between k and kdetS (upper row), and between −uv and τ12S det (lower row) at: (a) x/LS=0.271, (b) x/LS=0.553, and (c) x/LS=0.835. Values at t/TR=0.7 are selected as representatives for the turbulent parameters.
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Comparisons between k and kdetR (upper row), and between −uv and τ12R det (lower row). (a) x/LS=0.172, (b) x/LS=0.212, and (c) x/LS=0.355. Values at t/TR=0.5 that correspond to the same rotor location are selected as representatives for the turbulent parameters.
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Distributions of average passage lateral velocity component. v⁁S/Utip, (a) downstream and (b) upstream of the rotor blade row. The rotor blade occupies the 0.0<x/LS<0.132 region. Flow from right to left.
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Distributions of v⁁S/Utip in sample planes located upstream (x/LS=−0.07) and downstream (x/LS=0.153) of the rotor blade row
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Tangential nonuniformity in the average passage specific work input (W*) at 16 percent rotor axial chord downstream (at x/LS=0.153) of the rotor blade row due to the nonuniform average passage lateral velocity distribution

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