Flow control method and means

Details Flow control method and means Flow control method and means

1990-08-28

1994-01-04

Look, Edward K.

Rotary kinetic fluid motors or pumps

Method of operation

415 26, 415 47, 415 51, 415 585, 415116, 415118, 415119, 60 39091, 60 3929, F01D 1708

Patent

active

052755282

ABSTRACT:
The invention provides a method of controlling gas flow in an axial flow compressor, in which the flow at least at one chosen station in the direction of flow through the compressor is sensed at a series of circumferentially spaced positions. Flow variations above a predetermined limit are evaluated to give an actuating response if the variations indicate a disturbance above a predetermined acceptable level is present. When such a disturbance is detected, high pressure flow bled from the exit end of the compressor is injected at said station to supplement the main gas flow there. An incipient rotating stall cell will appear as a variation occurring sequentially at the circumferentially spaced positions. By responding to such a condition with a pressure injection flow, it is found possible to suppress both rotating stall and surge conditions in the compressor before the disturbance develops fully.

REFERENCES:
patent: 4196472 (1980-04-01), Ludwig et al.
patent: 4255083 (1981-03-01), Andre et al.
"Tests of an Improved Rotating Stall Control System on a J-85 Turbojet Engine", G. R. Ludwig, AFAPL-TR-79-2060 Air Force Aero-Propulsion Laboratory, Wright-Patterson AFB, Ohio, Aug. 1979.
"Presentation to the Workshop on Applications of Active Control to Engineering Systems", I. J. Day, Cambridge, U.K. Jun. 1990.

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