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TECHNICAL PAPERS

Numerical Optimization of a Vaned Shroud Design for Increased Operability Margin in Modern Centrifugal Compressors

[+] Author and Article Information
M. T. Barton, M. L. Mansour, J. S. Liu, D. L. Palmer

 Honeywell Aerospace, 111 S. 34th Street, Phoenix, AZ 85034

J. Turbomach 128(4), 627-631 (Mar 01, 2004) (5 pages) doi:10.1115/1.2187526 History: Received October 01, 2003; Revised March 01, 2004

This paper describes the computational fluid dynamics (CFD) approach coupled with an automated grid generation technique utilized for the numerical optimization of a modern centrifugal compressor with an inducer vaned shroud for increased operability margin. The grid generation process was automated to permit rapid optimization of the impeller and vaned shroud geometry. A three-dimensional, viscous, steady flow, mixing-plane approach was utilized to numerically analyze the impeller and vaned shroud in a coupled fashion to capture the interaction effects. The numerical technique verifies the ability of the vane shroud to extend compressor surge margin at the part-speed operating condition, while maintaining acceptable high-speed performance. CFD analyses confirm that the aerodynamics of the vaned shroud match expectation, and are consistent with the mass-averaged compressor speedline characteristics generated from the CFD results.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Centrifugal compressor application of vaned shroud

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Figure 2

Isometric view of vaned shroud

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Figure 3

Patented vaned shroud improves surge margin with a clean, simple installation

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Figure 4

Computational fluid dynamics (CFD) model

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Figure 5

Grid detail showing clearance modeling technique

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Figure 6

Pressure ratio versus flow map from ADPAC

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Figure 7

Efficiency versus flow map from ADPAC

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Figure 8

CFD analyses confirms internal flow physics of vaned shroud

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Figure 9

Vaned shroud/impeller flowfield from ADPAC CFD analyses at 85%Nc near-stall showing flow diverted toward impeller hub

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Figure 10

Vaned shroud/impeller flowfield from ADPAC CFD analyses at 100%Nc peak efficiency showing flow admitted through the vanes

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