Direct Method for Optimization of a Centrifugal Compressor Vaneless Diffuser

[+] Author and Article Information
Yu-Tai Lee

Naval Surface Warfare Center, Carderock Division, West Bethesda, MD 20817

Lin Luo

The Pennsylvania State University, University Park, PA 16801

Thomas W. Bein

Naval Surface Warfare Center, Annapolis Detachment, Annapolis, MD 21402

J. Turbomach 123(1), 73-79 (Feb 01, 2000) (7 pages) doi:10.1115/1.1308571 History: Received February 01, 2000
Copyright © 2001 by ASME
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Generic air-conditioning compressor
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Schematics of the vaneless diffuser geometry
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Typical computational grid for turbulent plane diffuser
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Optimization of plane diffuser and comparison with 7: (A) diffuser shapes; (B) wall shear stress
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Optimization of vaneless diffuser: (A) three-point spline; (B) six-point spline (Cp=static pressure rise, ω=total pressure loss)
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Comparison of three-point and six-point spline shapes
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Impact of the weighting coefficients in Eq. (4)
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Computational grids for the original shape and the final shape using conjugate gradient method
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Selected intermediate shroud shapes through 26 iterations from the original curve
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Predicted flow path: (A) on the front plate; (B) on a radial section
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Predicted total velocity contours
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Predicted static pressure contours
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Measured compressor efficiency for the original and the modified diffusers
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Measured system energy consumption for the original and the modified diffusers
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Initial diffuser shape and grid after the first gradient cycle
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Diffuser shapes and grids for evaluating gradient vector



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