Method and device for stabilizing a compressor current

Abstract

The present invention relates to a method for providing a fluid flow to a compressor system of a first turbo machine, wherein the compressor system includes at least one compressor housing in which at least one impeller is arranged and through which a compressor flow flows. The method includes feeding a primary fluid flow to a mixing region of the compressor system. The method further includes feeding a secondary fluid flow from an outside region of the compressor housing to the mixing region so that the secondary fluid flow mixes at least in part with the primary fluid flow to form a resulting fluid flow so that between the primary fluid flow and the secondary fluid flow a momentum exchange takes place, and so that the secondary fluid flow is promoted by the primary fluid flow. The method further includes feeding the resulting fluid flow to the compressor flow upstream of the impeller in the direction of the impeller.

1 . A method for providing a fluid flow to a compressor system of a first turbo machine, wherein the compressor system comprises at least one compressor housing in which at least one impeller is arranged and through which a compressor flow flows, with the method comprising:
 feeding a primary fluid flow to a mixing region of the compressor system;   feeding a secondary fluid flow from an outside region of the compressor housing to the mixing region so that the secondary fluid flow mixes at least in part with the primary fluid flow to form a resulting fluid flow so that between the primary fluid flow and the secondary fluid flow a momentum exchange takes place, and so that the secondary fluid flow is promoted by the primary fluid flow; and   feeding the resulting fluid flow to the compressor flow upstream of the impeller in the direction of the impeller.   
     
     
         2 . The method according to  claim 1  in which the primary fluid flow is diverted from a compressor flow of a second turbo machine, preferably from the compressor flow of the first turbo machine downstream of the impeller. 
     
     
         3 . The method according to  claim 1  in which the impeller comprises several blades, and the resulting fluid flow is fed to the compressor flow in such a manner that the resulting fluid flow impinges the impeller in the region of the tips of the blades. 
     
     
         4 . (canceled) 
     
     
         5 . The method according to  claim 1  in which the compressor defines a flow channel, and the mixing region is situated at least in part outside the flow channel, preferably completely outside the flow channel. 
     
     
         6 . The method according to  claim 1  in which the compressor housing defines a flow channel, and the mixing region is situated at least in part in the flow channel. 
     
     
         7 . The method according to  claim 1  in which the compressor housing defines a flow channel, and the mixing region is closed off at least in part from the flow channel. 
     
     
         8 . The method according to  claim 1  with the alignment of the resulting fluid flow in such a manner that the resulting fluid flow impinges the blade essentially perpendicularly to a blade axis of a blade of the impeller and/or at an angle to a plane of the impeller. 
     
     
         9 . The method according to  claim 8  in which the angle is varied depending on a rotating speed of the impeller, preferably in a range of 20° to 160°, particularly preferably in a range of 90° to 140°. 
     
     
         10 . The method according to  claim 1 , in which an admixing ratio of a quotient of a mass flow of the secondary fluid flow and of a mass flow of the primary fluid flow is at least 1, preferably at least 3, and particularly preferably at least 10. 
     
     
         11 . A device for providing a fluid flow to a compressor system of a first turbo machine, the device comprising:
 a compressor housing that defines a flow channel in which at least one impeller is arranged;   a first supply line for a primary fluid flow, wherein the first supply line comprises a first inlet for the primary fluid flow and a first outlet, wherein the first outlet upstream of the impeller is in fluidic communication with the flow channel; and   a second supply line for a secondary fluid flow, wherein the second supply line comprises a second inlet that is in fluidic communication with an outside region of the compressor housing, and comprises a second outlet that upstream of the impeller is in fluidic communication with the flow channel;   wherein the first outlet and the second outlet are arranged in such a manner relative to each other that the secondary fluid flow mixes at least in part with the primary fluid flow to form a resulting fluid flow directed onto the impeller so that between the primary fluid flow and the secondary fluid flow a momentum exchange takes place, and so that the secondary fluid flow is promoted by the primary fluid flow.   
     
     
         12 . The device according to  claim 11  in which the first inlet is in fluidic communication with a compressor stage of a second turbo machine, preferably is in fluidic communication, downstream of the impeller, with the flow channel of the first turbo machine. 
     
     
         13 . The device according to  claim 11  or  12  in which the first outlet and/or the second outlet are/is arranged in a peripheral region of the flow channel. 
     
     
         14 . The device according to  claim 11  in which the first is arranged inside the flow channel and is preferably aligned in the direction of the impeller. 
     
     
         15 . The device according to  claim 11  with a mixing line that comprises a third inlet and a third outlet, wherein the third inlet faces the first outlet, and the third outlet is in fluidic communication with the flow channel, and is aligned in the direction of the impeller. 
     
     
         16 . The device according to  claim 15  in which the third inlet has a diameter D, and a distance a between the first outlet, and the third inlet is in a range of −3D≦a≦5D, preferably 0≦a≦4D, particularly preferably 2D≦a≦4D, wherein a negative distance indicates that the third inlet is situated upstream of the first outlet. 
     
     
         17 . The device according to  claim 15  in which a ratio of a cross-sectional area of the third inlet to a cross-sectional area of the first outlet is between 1:1 and 100:1, preferably between 5:1 and 50:1 and particularly preferably between 10:1 and 40:1. 
     
     
         18 . The device according to  claim 11  in which the first outlet and/or the third outlet are/is aligned so as to be essentially perpendicular to a blade axis of a blade of the impeller and/or at an angle to a plane of the impeller. 
     
     
         19 . The device according to  claim 18  which is equipped to vary the angle depending on a rotating speed of the impeller, preferably in a range of 20° to 160°, particularly preferably in a range of 90° to 140°. 
     
     
         20 . (canceled) 
     
     
         21 . The device according to  claim 11  with a mixing region that upstream of the impeller is in fluidic communication with the flow channel, and into which mixing region the first outlet and the second outlet lead. 
     
     
         22 . The device according to  claim 21  in which the mixing region comprises a mixing chamber that at least in part is situated within the flow channel. 
     
     
         23 . (canceled)