Rotary kinetic fluid motors or pumps – Plural runners supported for relative motion or on separate... – Serially spaced in working fluid flow path
Patent
1994-02-17
1995-08-01
Look, Edward K.
Rotary kinetic fluid motors or pumps
Plural runners supported for relative motion or on separate...
Serially spaced in working fluid flow path
415 69, 415146, 415147, F04D 1902, F04D 2702
Patent
active
054375398
ABSTRACT:
The invention is a turbo machine comprising a rotatably mounted blade row, such as a compressing or pumping rotor and apparatus for providing aerodynamic feedback to the blade row which feedback apparatus has substantially zero pressure difference across it. The feedback may be provided by various apparatus, including at least one free-rotor that is mounted in aerodynamic feedback with the blade row, for instance coaxially with respect to the axis of rotation of the blade row and freely rotatably with respect to the blade row. The free-rotor may also be located in ductwork in communication with the blade row. The feedback may also be provided by a blade row having a variable stagger angle and apparatus to adjust the stagger angle so that the mean pressure rise across the variable stagger angle blade row is zero. The invention also includes a method for controlling operating anomalies such as rotating stall and surge of a turbo machine such as a compressor using the above described apparatus.
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Paduano, J., Epstein, A. H., Longley, J. P., Valavani, L., Greitzer, E. M., Guenette, G. R., "Active Control of Rotating Stall in a Low Speed Axial Compressor," ASME Paper 91-GT-88, pp. 1-10 (1991).
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N. Venkatrayulu, D. Prithvi Raj and R. G. Naraynamurthi, "Influence of Freely Rotating Inlet Guide Vanes on the Return Flows and Stable Operating Range of an Axial Flow Fan," Journal of Engineering for Power, vol. 102, pp. 75-80, ASME (1980).
Gysling Daniel L.
Simon Jonathan S.
Larson James A.
Look Edward K.
Massachusetts Institute of Technology
Weissburg Steven J.
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