Abstract: A method for the production of secondary fluid ducts for a turbomachine, especially for fluid supply or fluid removal to/from a flow-wetted surface of the turbomachine, with the secondary fluid ducts being produced by an electrochemical machining process.

Abstract: A turbomachine has at least one stator (4) and at least one downstream rotor (7), with the stator (4) being provided with stationary stator blades and the rotor (7) comprising several rotor blades attached to a rotating shaft. A casing (2) confines the passage of fluid through the rotor (7) and the stator (4) in the outward direction. A mechanism for peripheral jet creation is provided in the area of at least one vane of the stator (4), with at least one nozzle (21) issuing fluid at the radially outer boundary of a main flow path.

Abstract: A free end of a blade of a fluid flow machine has a skeleton line camber distribution having an excessive value to a relative skeleton line camber of at least ?*=0.35 for a related running length of s*=0.1 in a blade profile flow line section between the free end and a blade section at 30% of a main flow path width from the free end. S* is a local running length relative to a total running length of the profile skeleton line and ?* is an angular change of the skeleton line relative to a total camber of the skeleton line from a leading edge to a related running length s*. The skeleton line camber distribution runs between leading edge point V (s*=0, ?*=0) and trailing edge point H (s*=1, ?*=1).

Abstract: A fluid flow machine has a main flow path in at least one stage, with a rotor arrangement and a stator arrangement, resulting in an increased rotor-stator constriction ratio QRS, which satisfies the following equation: [0.2+(KT?0.45)0.1]<QRS, with QRS being defined to the following formula: QRS=KR/KS with KT being the total stage constriction, and with QRS and KT being determined as follows: QRS=KR/KS with KR=ARI/ARA and KS=ASI/ASA KT=ARI/ASA with ARI, ARA, ASI and ASA being calculated as follows: ARI=?(R22?R12) ARA=?(R42?R32) ASI=?(R62?R52) ASA=?(R82?R72).

Abstract: A main flow path of a fluid flow machine includes N adjacent member blade rows firmly arranged relative to each other in both a meridional direction m and a circumferential direction u. A number of the member blade rows, N, is greater than/equal to 2 and (i) designates a running index with values between 1 and N. A trailing edge HK (i) of a blade of the member blade row (i) is spaced from a leading edge VK(i+1) of a blade of the adjacent, downstream member blade row (i+1) by a meridional edge distance D in a meridional plane established by axial direction x and radial direction r. A value of D along a height of the main flow path increases towards the main flow path confinement at least along a part of the area between the main flow path center and the main flow path confinement.

Abstract: A fluid flow machine has a main flow path in which at least one row of blades (2) is arranged, with at least one blade end of a blade row (2) being firmly connected to the main flow path confinement and, in an area of this fixed blade end at a sidewall (9), at least one longish, obstacle-type boundary layer barrier (11) is provided which in at least part of its course is oriented obliquely to the main flow direction, thereby deflecting fluid flowing near the sidewall towards the blade pressure side.

Abstract: A fluid flow machine has a main flow path which is confined by a hub (3) and a casing (2) and in which at least one row of variable stator vanes (1) is arranged. The stator vanes (1) are rotatably borne around a rotary axis 4. On at least one of the hub (3) and the casing (2), at least one arrangement with at least two stator vanes (1) connected to a common rotary base (5) is provided, such that the at least two stator vanes (1) are rotatable around the rotary axis (4) when this multi-vane variable stator unit is varied.

Abstract: A fluid flow machine has a main flow path (“MFP”) 2 with a blade row 5 therein, a blade end of a blade row being connected to the MFP confinement and a peripheral chamber 7 arranged near this blade end outside the MFP confinement. An outlet 6 is arranged near the fixed blade end near a blade suction side can issue fluid from peripheral chamber 7 onto the surface of the MFP confinement into the MFP. The fluid jet is oriented essentially tangentially to the contour of the MFP confinement when viewed in the meridional plane (x-r plane) and essentially parallel to the local tangent to the skeleton line of the nearest profile, when viewed in the plane established by circumferential direction u and meridional direction m.

Abstract: A fluid flow machine includes a main flow path which is confined by a hub (3) and a casing (1) and in which at least one row of blades (5) is arranged, with a blade end with gap being provided on the blade row, with the blade end and the main flow path confinement performing a rotary movement relative to each other in a vicinity of the blade end, with at least part of the running gap (11) retracted radially from the main flow path confinement into the main flow path, with the running gap (11) at the retractions no longer being confined by the main flow path confinement, but by a peripheral guiding device (10) passed by the main flow and firmly connected to the main flow path confinement and having a row of profiles (12).

Abstract: A fluid flow machine has a main flow path 2 which is confined by a hub 3 and a casing 1 and in which at least one row of blades 5 is arranged. A gap 11 is provided on at least one blade row 5 between a blade end and a main flow path confinement, with the blade end and the main flow path confinement performing a rotary movement relative to each other. At least one reversing duct 7 is provided in the area of the blade leading edge in the main flow path confinement at a discrete circumferential position. The reversing duct 7 connects two openings 12, 13 arranged on the main flow path confinement.

Abstract: A fluid-flow machine has at least one row of blades 5 having blade ends moving relative to one of a hub 3 and a casing 1, with a gap 11 positioned therebetween. At least one groove 7 extends essentially in a circumferential direction of the machine is in an area of the gap 11 along at least part of the circumference, with the extension of the groove 7 in the circumferential direction being large as compared to the extension of the groove 7 in the meridional flow direction. A cross-sectional area of the groove 7, in meridional view of the fluid-flow machine, essentially departs from a parallelogrammic shape and, due to its contour, is inclined in an upstream direction. A centroid of the groove cross-sectional area is provided upstream of the center of the groove aperture 12 on the main flow path.

Abstract: A fluid flow machine includes a main flow path in which at least one row of blades (3, 4) is arranged, and a blade shroud (2) which forms a confinement of the main flow path in the area of a blade row (3, 4) and is arranged in a recessed cavity (10) of a surrounding physical structure (11). The cavity (10) so formed between the shroud (2) and the surrounding physical structure (11) is provided with an annular connection (14) to the main flow path at least on the outflow side of the blade shroud (2), and with the blade shroud (2) being penetrated by at least one secondary flow path (16) which, commencing at a location of high pressure on the shroud (2), issues at a surface wetted by the main flow.

Abstract: A fluid flow machine includes at least one rotor blade row designed for high work coefficients, which—in its center section and/or averaged over the blade height—provides for an essentially swirl-free relative outflow. The respective rotor, in its trailing edge area, is essentially orientated in meridional direction, which essentially corresponds to the meridional flow direction.

Abstract: A fluid flow machine has a flow path (2) which is confined by at least one wall, on which at least one row of blades (6, 7) is fixedly mounted. At least one fluid offtake opening (9) and at least one fluid supply opening (10), which are connected by at least one fluid return path (11), are arranged in the wall in an area of a blade row (6, 7), with a circumferential extension of the fluid supply opening (10) being less than a distance between two adjacent blades.

Abstract: A fluid flow machine has a flow duct 2 confined by a wall of a casing 1, with a fluid supply chamber 8 being arranged in an area of the wall, which is in flow connection with an injector insert 9. The injector insert 9 is provided with an injector nozzle 10 for supplying fluid from the fluid supply chamber 8 into the flow duct 2. The injector insert 9 is closely connected to the wall of the fluid supply chamber 8.

Abstract: A fluid flow machine includes at least one casing 1 and at least one rotor drum 3 rotatable about a machine axis 4, with stator vanes 8 and rotor blades 7 being arranged in an annulus duct 2 formed between the casing 1 and the rotor drum 3 The annulus duct 2 is divided into an outer annular duct 5 and an inner annular duct 6 by at least one annular flow divider 11, in each of which rotor blades 7 and stator vanes 8 are arranged Outer rotor blades 7a, which are arranged in the outer annular duct 5, are rotatable at a different speed than the inner rotor blades 7b, which are arranged in the inner annular duct 6.

Abstract: A turbomachine with fluid removal, having at least one stator and at least one downstream rotor, with the stator being provided with stationary blades (1) and the rotor comprising several rotor blades attached to a rotating shaft, with a casing (2) confining the passage of fluid through the rotor and the stator in the outward direction, wherein, in an area of at least one blade (1) of the stator, a provision for fluid removal is provided adjacent to a suction side (3) of the blade (1).

Abstract: A fluid flow machine includes an annulus duct (2) formed between a casing (1) and a rotor drum (3), which is rotatable about a machine axis (4). At least one row of rotor blades (6) is arranged in the annulus duct (2), with the latter forming a main flow path and with at least one fluid injector nozzle (8) being arranged in the area of a wall of the casing (1) and/or of the rotor drum (3). At least part of the injector nozzle (8) protrudes into the main flow path (9) and is provided for the generation of a jet which is tangentially directed to the wall of the main flow path.

Abstract: A centrifugal compressor includes a rotor 2, which is rotatably borne in a casing 1. A fluid gap flow between the casing 1 and the rotor 2 is extracted via cutouts in the casing 1.

Abstract: An aircraft propulsion unit includes a gas-turbine core engine 10 having at least one compressor, one combustion chamber and one turbine driving a main shaft 11. The main shaft 11 of the gas-turbine core engine 10 is operationally connected to at least two separate fans 6-9 via a mechanical drive connection, each of them being arranged beside the gas-turbine core engine 10.