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TECHNICAL PAPERS

Effects of Inlet Flow Field Conditions on the Performance of Centrifugal Compressor Diffusers: Part 2—Straight-Channel Diffuser

[+] Author and Article Information
S. Deniz, E. M. Greitzer

Gas Turbine Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139

N. A. Cumpsty

Whittle Laboratory, Department of Engineering, Cambridge University, Cambridge CB3 0DY, United Kingdom

J. Turbomach 122(1), 11-21 (Feb 01, 1998) (11 pages) doi:10.1115/1.555424 History: Received February 01, 1998
Copyright © 2000 by ASME
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References

Filipenco,  V. G., Deniz,  S., Johnston,  J. M., Greitzer,  E. M., and Cumpsty,  N. A., 2000, “Effects of Inlet Flow Field Conditions on the Performance of Centrifugal Compressor Diffusers: Part 1—Discrete-Passage Diffuser,” ASME J. Turbomach., 122, pp. 1–10.
Krain, H., 1984, “Experimental Observation of the Flow in Impellers and Diffusers,” in: Flow in Centrifugal Compressors, Von Karman Institute for Fluid Dynamics, Lecture Series No. 1984-07.
Kano, F., Tazawa, N., and Fukao, Y., 1982, “Aerodynamic Performance of Large Centrifugal Compressors,” ASME J. Eng. Power, 104 , No. 2.
Rodgers, C., 1982, “The Performance of Centrifugal Compressor Channel Diffusers,” ASME Paper No. 82-GT-10.
Reneau,  L. R., Johnston,  J. P., and Kline,  S. J., 1967, “Performance and Design of Straight, Two-Dimensional Diffusers,” ASME J. Basic Eng., 89, pp. 141–150.
Yoshinaga,  Y., Gyobu,  I., Mishina,  H., and Koseki,  F., and Hishida,  N., 1980, “Aerodynamic Performance of a Centrifugal Compressor With Vaned Diffusers,” ASME J. Fluids Eng., 102, pp. 486–493.
Runstadler,  P. W. J., and Dean,  R. C. J., 1969, “Straight Channel Diffuser Performance at High Inlet Mach Numbers,” ASME J. Basic Eng., 91, pp. 397–422.
Runstadler, P. W., and Dolan, F. X., 1973, “Further Data of the Pressure Recovery Performance of Straight-Channel, Plane-Divergence Diffusers at High Subsonic Inlet Mach Numbers,” ASME J. Fluids Eng., 95 .
Dong, Y., 1996, private communication.
Yaras,  M. I., 1996, “Effects of Inlet Conditions on the Flow in a Fishtail Curved Diffuser With Strong Curvature,” ASME J. Fluids Eng., 118, pp. 772–778.
Kenny, D. P., 1972, “A Comparison of the Predicted and Measured Performance of High Pressure Ratio Centrifugal Compressor Diffusers,” ASME Paper No. 72-GT-54.
Deniz, S., 1997, “Effects of Inlet Flow Field Conditions on the Performance of Centrifugal Compressor Diffusers,” MIT Gas Turbine Laboratory Report #225. Mar., Cambridge, MA.
Hunziker, R., 1993, “Einfluss der Diffusorgeometrie auf die Instabilliätsgrenze des Radialverdichters,” Dissertation, ETH Zurich, Swiss Federal Institute of Technology, Switzerland, #10252.
Japikse, D., and Osborne, C., 1986, “Optimization of Industrial Centrifugal Compressors: Part 6B: Studies in Component Performance—Eight Design Cases From 1972 to 1982,” ASME Paper No. 86-GT-222.
Deniz,  S., Greitzer,  E. M., and Cumpsty,  N. A., 1998, “Effects of Inlet Flow Field Conditions on the Performance of Centrifugal Compressor Diffusers: Part 2—Straight-Channel Diffuser,” ASME Paper No. 98-GT-474; 2000, ASME J. Turbomach., 122, pp. 11–21.
Runstadler, P. W., Dolan F. X., Dean, R. C., Diffuser Data Book, Creare Technical Note TN-186, Hanover, NH, May 1975.
Runstadler, P. W., and Dolan, F. X., 1973 “Further Data of the Pressure Recovery Performance of Straight-Channel, Plane Divergence Diffusers at High Subsonic Inlet Mach Numbers,” ASME J. Fluids Eng., 95 .
Rogers, C., and Shapiro, L., “Design Considerations for High Pressure Ratio Centrifugal Compressors,” ASME Paper No. 72-GT-91, 1972.
Filipenco, V. G., “Experimental Investigation of Flow Distortion Effects on the Performance of Radial Discrete-Passage Diffusers,” GTL. Report No. 206, Massachusetts Institute of Technology, Sept. 1991.
Filipenco, F. G., personal communication, Aug. 1998.
Klassen, H. A., 1973, “Performance of a Low-Pressure Ratio Centrifugal Compressor With Four Diffuser Designs,” NASA TN D-7237, Mar.
Rodgers, C., and Sapiro, L., 1972, “Design Considerations for High Pressure Ratio Centrifugal Compressors,” ASME Paper No. 72-GT-91.
Sakai, T., Tohbe, Y., Fujii, T., and Tatsumi, T., 1997, “Development of a High Pressure Ratio Centrifugal Compressor for 300 kW-Class Ceramic Gas Turbine,” ASME Paper No. 97-GT-480.

Figures

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Pressure recovery coefficient, Cp, as a function of inlet blockage, B1, for single-channel diffusers with different area ratios and divergence angles; comparison of the data from Dong 9 (Cp is based on mass-averaged diffuser inlet total pressure) and Runatadler and Dolan 8 (Cp is based on diffuser inlet centerline total pressure)
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Straight-channel diffuser geometry and static pressure tap locations
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(a) Axial distributions of flow angle, α, at the straight-channel diffuser inlet for different corrected impeller speeds (no injection/suction) (b) Axial distributions of absolute Mach number, M, at the straight-channel diffuser inlet for different corrected impeller speeds (no injection/suction)
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Mass-averaged overall straight-channel diffuser pressure recovery coefficient, Cp, versus momentum averaged diffuser inlet flow angle, α, for different corrected impeller speeds (no/injection/suction)
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Mass-averaged overall straight-channel diffuser pressure recovery coefficient, Cp, versus diffuser inlet Mach number, M, for different corrected impeller speeds (no injection/suction)
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Examples of flow angle, α, axial distribution at the straight-channel diffuser inlet (with injection/suction): (a) Series II, N=5000 rpm, (b) Series III, N=2000 rpm, (c) Series IV, N=4000 rpm
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Mass-averaged overall straight-channel diffuser pressure recovery coefficient, Cp, versus momentum averaged diffuser inlet flow angle, α, for different corrected impeller speeds and data series (I, II, III, IV) with and without injection/suction
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Mass-averaged overall straight-channel diffuser pressure recovery coefficient, Cp, versus diffuser inlet blockage, B, with and without injection/suction
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Mass-averaged overall diffuser pressure recovery coefficient, Cp, versus diffuser inlet Mach number, M, represented for constant diffuser inlet flow angles
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Mass-averaged overall diffuser pressure recovery coefficient, Cp, versus diffuser inlet blockage, B, represented for constant diffuser inlet flow angles
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Mass-averaged overall diffuser pressure recovery coefficient, Cp, versus diffuser inlet flow angle nonuniformity, αn, represented for constant diffuser inlet flow angles
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Static pressure distribution along the centerline of a straight-channel diffuser channel for different flow angles at a constant impeller speed N=2000 rpm (with injection/suction)
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Comparison of mass-averaged overall diffuser pressure recovery coefficient, Cp, for straight-channel and discrete-passage diffusers
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Design point of the discrete passage diffuser (from 16, p. 87)
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Design point of the straight-channel diffuser (from 16, p. 60)
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Meridional view of discrete-passage and straight-channel diffuser illustrating the difference in diffuser leading edge and throat location

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