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TECHNICAL PAPERS

One-Dimensional Performance Prediction of Subsonic Vaned Diffusers

[+] Author and Article Information
Beat Ribi, Peter Dalbert

Sulzer Turbo Ltd., Zurich, Switzerland

J. Turbomach 122(3), 494-504 (Feb 01, 1999) (11 pages) doi:10.1115/1.1303816 History: Received February 01, 1999
Copyright © 2000 by ASME
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References

Oh,  H. W., Yoon,  E. S., and Chun,  M. K., 1997, “An Optimum Set of Loss Models for Performance Prediction of Centrifugal Compressors,” Proc. Inst. Mech. Eng., Part C: J. Mech. Eng. Sci., 211, Part A.
Hammoud, J. A., et al., 1996, “A Method of Performance Prediction for Turbocharging Centrifugal Compressors,” presented at the ASME International Congress on Fluid Dynamics & Propulsion, Cairo, Egypt, Dec.
Reneau, L. R., Johnston, J. P., and Kline, S. J., 1967, “Performance and Design of a Straight, Two-Dimensional Diffuser,” ASME J. Basic Engineering, 89 .
Traupel, W., 1977, Thermische Turbomaschinen, Band I, Auflage 3, Springer-Verlag.
Stratford, B. S., and Beavers, G. S., 1959, “The Calculation of the Compressible Turbulent Boundary Layer in an Arbitrary Pressure Gradient—A Correlation of Certain Previous Methods,” Aeronautical Research Council, R&M No. 3207, Sept.
Herbert, M. V., 1980, “A Method of Performance Prediction for Centrifugal Compressors,” Aeronautical Research Council, R&M No. 3843, Feb.
Pinot, P., 1977, “Diffuser Performance at Low Area Ratio and Length/Width Ratio,” Rolls-Royce Technical Note LTN 72395, Jan.
Japikse, D., 1996, “Centrifugal Compressor Design and Performance,” Concepts ETI, Wilder, VT, pp. 3–42.
Greitzer,  E. M., 1981, “The Stability of Pumping Systems—The Freeman Scholar Lecture,” ASME J. Fluids Eng., 103, pp. 193–242.
Hunziker, R., 1993, “Einfluss der Diffusorgeometrie auf die Instabilitätsgrenze des Radialverdichters,” Dissertation ETH Zürich.

Figures

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Parameters to assess the influence of an ill-predicted slope on the instability line
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Increased displacement and momentum thickness due to separated flow
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Calculation stations of the vaned standardized diffuser
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Geometric considerations to determine the through-flow area A3
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Factor ksep to increase the calculated displacement thickness in order to account for separation
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Factor lsep to increase the calculated momentum thickness in order to account for separation
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Measured and predicted characteristics for an 18 deg diffuser with z=24,r4/r2=1.33, in combination with an impeller with β2S=35 deg,z=14
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Measured and predicted characteristics for a 26 deg diffuser with z=24,r4/r2=1.50, in combination with an impeller with β2S=45 deg,z=15
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Comparison of measured and predicted slopes ∂Dpdiff/∂α2 at maximum flow rate
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Comparison between measured and predicted slopes ∂Dpdiff/∂α2 at surge
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Parameters required for the assessment of the influence of an ill-predicted slope
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Distribution and frequency of the relative error Δα2 err2 min
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Relation between relative error Δα2 err2 min and predicted slope ∂Dpdiff/∂α2|sim
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Sketch of the characteristics and values needed to fulfill the criteria for dynamically stable operation at α2 min
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Predicted influence of diffuser vane angle change based on data prepared for the stage stacking program (RADAX). Original stage (Mu2=0.8); impeller: β2S=45 deg,z=15,b2I/D2=0.071; diffuser: α3D=22 deg,z=24,r4/r2=1.50,b2D/D2=0.071.
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Predicted influence of diffuser vane number based on data prepared for the stage stacking program (RADAX): original stage (Mu2=0.8): impeller: β2S=45 deg,z=15,b2I/D2=0.71; diffuser: α3D=22 deg,z=24,r4/r2=1.50,b2D/D2=0.071
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Predicted influence of reduced diffuser height, based on measurements: original stage (Mu2=0.8): impeller: β2S=50 deg,z=18,b2I/D2=0.038; diffuser: α3D=22 deg,z=12,r4/r2=1.35,b2D/D2=0.038

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