Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Vane or deflector
Patent
1993-12-21
1995-05-23
Look, Edward K.
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Vane or deflector
F04D 2944
Patent
active
054175470
ABSTRACT:
A vaned diffuser for centrifugal and mixed flow pumps which has vanes in two rows radially displaced from each other, wherein the vanes are arranged in an optimal positional relationship to each other to improve the diffuser performance with the total pressure loss coefficient and the static pressure recovery coefficient. The vaned diffuser includes vanes arranged in a fluid flow field defined at the outer periphery of an impeller of a centrifugal or mixed flow pump. The vanes are circumferentially arranged in two rows, that is, a first row and a second row, which are equal in number of vanes and radially displaced from each other such that the respective chords of each pair of adjacent vanes in the first and second rows are approximately parallel to each other, and the trailing edges of the vanes in the first row and the leading edges of the vanes in the second row are radially spaced from each other at a distance .DELTA.R=0.05 L to 0.4 L, where L is the chord length of the vanes in the first row.
REFERENCES:
patent: 3356289 (1967-12-01), Plotkowiak
patent: 3372862 (1968-03-01), Koenig
patent: 3588270 (1971-06-01), Boelcs
patent: 4824325 (1989-04-01), Bandukwalla
Senoo et al., "Low Solidity Tandem Cascade Diffuser for Centrifugal Blower", Proceedings (B) of the Japan Society of Mechanical Engineers, vol. 49, No. 439, Mar., 1983.
Harada et al., "Numerical and Experimental Studies of Single and Tandem Low-Solidity Cascade Diffusers in a Centrifugal Compressor", The American Society of Mechanical Engineers, 93-GT-108, Int'l Gas Turbine and Aeroengine Congress and Exposition, Cincinnati, Ohio, May 24-27, 1993.
Ebara Corporation
Look Edward K.
Verdier Christopher
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