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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

Figures

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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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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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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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Factor lsep to increase the calculated momentum thickness in order to account for separation
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Factor ksep to increase the calculated displacement thickness in order to account for separation
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Geometric considerations to determine the through-flow area A3
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Calculation stations of the vaned standardized diffuser
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Increased displacement and momentum thickness due to separated flow
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Parameters to assess the influence of an ill-predicted slope on the instability line

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