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TECHNICAL PAPERS

A Study on Impeller-Diffuser Interaction—Part II: Detailed Flow Analysis

[+] Author and Article Information
Kai U. Ziegler, Heinz E. Gallus, Reinhard Niehuis

RWTH Aachen, University of Technology, Institute of Jet Propulsion and Turbomachinery, 52062 Aachen, Germany, www.ist.rwth-aachen.de

J. Turbomach 125(1), 183-192 (Jan 23, 2003) (10 pages) doi:10.1115/1.1516815 History: Received October 26, 2001; Online January 23, 2003
Copyright © 2003 by ASME
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References

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Inoue,  M., and Cumpsty,  N. A., 1984, “Experimental Study of Centrifugal Impeller Discharge Flow in Vaneless and Vaned Diffusers,” ASME J. Eng. Gas Turbines Power, 106, pp. 455–467.
Yamane, T., Fujita, H., and Nagashima, T., 1993, “Transonic Discharge Flows Around Diffuser Vanes From a Centrifugal Impeller,” ISABE Paper 93-7053.
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Sato, K., He, L., 1998, “Effect of Rotor-Stator Interaction on Impeller Performance in Centrifugal Compressors,” Proc., ISROMAC Conf.
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Bramesfeld, W., 1995, “Optimierung eines Laser-Zwei-Fokus-Meßsystems zur berührungslosen Geschwindigkeitsmessung in Turbomaschinen,” doctoral thesis RWTH Aachen, VDI Fortschritt-Berichte, Reihe 9, Nr. 505, VDI Verlag.
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Figures

Grahic Jump Location
Laser-2-focus measurement technique
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Velocity triangle at 2M (area average over the measured region, α4SS=16.5 deg,r4/r2=1.04,nred/n0=0.8, P1)
Grahic Jump Location
Time-averaged relative velocity and angle at 2M4SS=16.5 deg,nred/n0=0.8, P1)
Grahic Jump Location
Absolute velocity and angle at 2M4SS=16.5 deg,nred/n0=0.8, P1)
Grahic Jump Location
Meridional velocity at 2M (vaneless diffuser, nred/n0=0.8, P1)
Grahic Jump Location
Absolute velocity and angle at 2M in the relative frame of reference
Grahic Jump Location
Unsteady absolute angle at 2M in the relative frame of reference (α4SS=16.5 deg,r4/r2=1.04,nred/n0=0.8, P1)
Grahic Jump Location
Unsteady relative angle at 2M4SS=16.5 deg,r4/r2=1.04,nred/n0=0.8, P1)
Grahic Jump Location
Unsteadiness coefficients of relative velocity and angle at 2M and absolute velocity and angle at 4M and 5 (α4SS=16.5 deg,nred/n0=0.8, P1)
Grahic Jump Location
Time-averaged absolute velocity (4M and 5), incidence (4M) and deviation angle (5) in the absolute and relative frame of reference (α4SS=16.5 deg,nred/n0=0.8, P1)
Grahic Jump Location
Absolute velocity at 4M and 5 (α4SS=16.5 deg,nred/n0=0.8, P1)
Grahic Jump Location
Incidence (4M) and deviation angle (5) (α4SS=16.5 deg,nred/n0=0.8, P1)
Grahic Jump Location
Absolute angle at 4M and 5 (α4SS=16.5 deg,nred/n0=0.8, P1)
Grahic Jump Location
Vortex in the diffuser throat
Grahic Jump Location
Unsteady incidence at 4M (α4SS=16.5 deg,r4/r2=1.14,nred/n0=0.8, P1)
Grahic Jump Location
Unsteady incidence at 4M (α4SS=16.5 deg,r4/r2=1.04,nred/n0=0.8, P1)

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