Active vaned passage casing treatment

Details Active vaned passage casing treatment Active vaned passage casing treatment

1993-10-15

1995-07-11

Look, Edward K.

Rotary kinetic fluid motors or pumps

With means for re-entry of working fluid to blade set

Axial flow runner

415145, F01D 112

Patent

active

054315336

ABSTRACT:
The recirculating flow in the vaned passage in the case surrounding the tips of the fan blades of a turbo fan engine or ducted fan propulsor is modified or blocked off during certain engine or aircraft operating modes. In one embodiment an aneroid valve closes off the vaned passage upon attaining a given altitude and fails open to assure that the safe stall margin is retained during take off. The active VPCT serves to increase fan efficiency and engine thrust while maintaining stall margin at the required safety level. The vaned passage in another embodiment is utilized to abate or preclude the stall precursor waves manifested by the rotor blade by modulating the recirculating flow as a function of time.

REFERENCES:
patent: 3620640 (1971-11-01), Lariviere
patent: 3846038 (1974-11-01), Carriere et al.
patent: 4155221 (1979-05-01), Dhoore et al.
patent: 5308225 (1994-05-01), Koff et al.

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