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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

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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