Electrodynamic control of blade clearance leakage loss in turbomachinery applications

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United States of America Patent

PATENT NO 9347331
APP PUB NO 20100183424A1
SERIAL NO

12664317

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Abstract

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Electrodynamic control of fluid leakage loss is provided. Embodiments utilize electrohydrodynamic (EHD) principles to control and/or reduce leakage flow in turbomachinery. Electrodes can be used to provide a flow actuation mechanism inside the clearance gap for generating discharge. The electrodes can be positioned to have geometric asymmetry. Embodiments provide the electrodes on a turbine blade. The blade can have a DC power that can function as a square pulsed DC wave with the duty cycle equal to the blade passing frequency and the stator can be grounded. In an embodiment, the stator can have the actuator of the electrode-insulator assembly attached to the inside. In one embodiment, the actuators can be arranged just on the stator or casing. The phase and power supply to individual electrodes can be adapted as needed. In one embodiment, the phase can be lagged for accurate control of leakage flow. The control of the power supply to the electrodes can involve a closed control loop that monitors tip gap size.

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Patent Owner(s)

Patent OwnerAddress
UNIVERSITY OF FLORIDA RESEARCH FOUNDATION INC223 GRINTER HALL GAINESVILLE FL 32611

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Roy, Subrata Gainesville, US 46 603

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