Axial flow compressor surge margin improvement

Details Axial flow compressor surge margin improvement Axial flow compressor surge margin improvement

F - Mech Eng,Light,Heat,Weapons

04

D

170/72

F04D 29/54 (2006.01) F04D 27/02 (2006.01) F04D 29/68 (2006.01)

Patent

CA 1314486

ABSTRACT OF THE DISCLOSURE AXIAL FLOW COMPRESSOR SURGE MARGIN IMPROVEMENT The casing 24 of an axial flow compressor 12 is provided with a plurality of axially extending cir- cumferentially spaced slots 30 in its internal cylindri- cal surface 32 adjacent the tips of at least one row of blades 26. A benefit in both stall margin improvement and a reduction in efficiency deficit may be achieved by positioning the leading edge of the slot 30 such that it leads the leading edge of the blade 26 by an amount termed the overhang or by reducing the closed to open ratio of the slots 30. A further reduction in effi- ciency deficit may be achieved by combining the overhang which individually gave the best stall margin improve- ment with a slot 30 closed to open ratio somewhat higher than the value which individually gave the best stall margin improvement.

483273

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