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TECHNICAL PAPERS

Flow Nonuniformities and Turbulent “Hot Spots” Due to Wake-Blade and Wake-Wake Interactions in a Multi-Stage Turbomachine

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

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

J. Turbomach 124(4), 553-563 (Nov 07, 2002) (11 pages) doi:10.1115/1.1509078 History: Received December 13, 2001; Online November 07, 2002
Copyright © 2002 by ASME
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References

Figures

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The axial turbomachine (a) test setup no. 1 used during most of the present experiments: (b) Test setup no. 2
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Optical access to the test section and the PIV system used in the present experiments
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(a) Phase-averaged velocity and (b) turbulent kinetic energy distributions at midspan, obtained by combining the results in several measurement domains. Utip=8 m/s is the tip velocity of rotor blade at 500 rpm: Ls=203 mm is the stage length starting from the rotor leading edge.
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Turbulent kinetic energy distribution within the 2nd -stage rotor passage, showing the wake of the rotor blade and the wakes of the 1st stage (rotor and stator) passing through and interacting with the blades
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Distributions of phase averaged: axial (ū) and lateral (v̄) velocity components, velocity magnitude (|V̄|), flow angle (ᾱ) vorticity (ω̄), and shear strain (S̄xy), as well as turbulent kinetic energy (k) and Reynolds shear stress (−uv) within the rotor passage of the 2nd stage. Data at four rotor phases, t/TR=0.1, 0.3, 0.5 and 0.7, are presented. Negative vorticity is out of the plane of the paper.
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Wake-wake interactions as the rotor wake of test setup no. 2 intersects with the stator wake. Shown are the distributions of phase-averaged velocity magnitude (|V̄|), flow angle (ᾱ) vorticity (ω̄), and shear strain (S̄xy), as well as turbulent kinetic energy (k) and Reynolds shear stress (−uv).x=0 is the rotor trailing edge and CRx=24 mm is the rotor axial chord. Utip=12.8 m/s is the blade tip speed at 800 rpm. The arrows indicate the location of stator wake segments. Negative vorticity is out of the plane of the paper.
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A vector map of the velocity relative to the velocity at the center of the (0.62, 0.64) vortex overlaid on the vorticity distribution. The arrows indicate location of the stator wake segments (see also Fig. 6). Negative vorticity is out of the plane of the paper.
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Phase-averaged flow showing wake-wake interactions and the formation of a kink in the 2nd -stage rotor wake of test setup no. 1, t/TR=0.9. (a) An enlarged vector map of the velocity relative to the velocity at the center of the (0.16, 0.17) “vortex” overlaid on the vorticity distribution. Negative vorticity is out of the plane of the paper. (b) ū (c) −uv (d) S̄xy (e) k.x=0 on the second x-axis is the rotor trailing edge and CRx=27 mm is the rotor axial chord.

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