Patent ID: 7329084

Claim:
A turbomachine comprising: at least one cavity having a cross-section with a shape selected from the group consisting of an annular shape and a ring-segment-shape; and at least one means for inducing and maintaining a forced flow with at least a tangentially oriented velocity component, the means being arranged inside the cavity and the means comprising: a first ejector disposed proximate a lowest geodetic level of the cavity and a first extraction point disposed proximate a highest geodetic level of the cavity, the first ejector delivering motive fluid extracted from the cavity at the first extraction point; a second ejector disposed proximate the highest geodetic level of the cavity and a second extraction point disposed proximate the lowest geodetic level of the cavity, the second ejector delivering motive fluid extracted from the cavity at the second extraction point; wherein the first extraction point is disposed upstream of the second ejector relative to blowout direction thereof, the second extraction point is disposed upstream of the first ejector relative to blowout direction thereof, and wherein the blowout directions are oriented such that at least a portion of outflow impulse is oriented in a circumferential direction of the cavity.