COMPRESSOR OVERROTOR DEVICE AND AXIAL-FLOW COMPRESSOR Russian patent published in 2006 - IPC F04D27/02 

FIELD: mechanical engineering.

SUBSTANCE: invention relates to axial-flow compressors for gas-turbine engines and plants. Proposed overrotor device of compressor contains ribs arranged in additional ring-shaped space in compressor housing arranged over blade of impeller of compressor stage and communicating with flow passage of compressor at angle to longitudinal axis of compressor and it is provided with ribs arranged at one and the same angle to surface pointed to side of flow passage in additional ring-shaped space of compressor. They are connected with space to form integral part and are provided with wedge-like tip on end pointed to side of end face of impeller blade of compressor stage. End of said tip is located at level of inner diameter of compressor housing. Axial length of additional ring-shaped space along longitudinal axis of compressor is 0.5-0.8 of value pf projection of chord of impellor blade of said axis, and radial size of additional ring-shaped space is 0.1-0.2 of height of blade of impeller. Radial surface of said additional ring-shaped space first in compressor flow is arranged at distance less than 0.1 of projection of chord on impeller blade, and number of blades is form 4 to 8.

EFFECT: enlarged range of stalless operation of compressor.

8 cl, 3 dwg