초록 ▼

A blade of a fluid-flow machine has at least one cavity 2 arranged in the blade 1, with the cavity 2 connecting to a fluid supply, and at least one outlet opening 3 connecting the cavity 2 to a flow path, in which the blade 1 is arranged. The outlet opening 3 is of a nozzle-type design and essential

A blade of a fluid-flow machine has at least one cavity 2 arranged in the blade 1, with the cavity 2 connecting to a fluid supply, and at least one outlet opening 3 connecting the cavity 2 to a flow path, in which the blade 1 is arranged. The outlet opening 3 is of a nozzle-type design and essentially inclined in a direction of a main flow extending longitudinally to a corresponding surface of the blade 1. The outlet opening 3 extends over at least a part of the blade 1 height and the outlet opening 3 forms a step in a contour of the blade 1 profile, with a fluid jet issuing from the outlet opening 3 essentially tangentially attaching onto the blade surface.

대표청구항 ▼

1. A blade of a fluid-flow machine with at least one cavity positioned in the blade, with said cavity connecting to a fluid supply, and at least one outlet having an opening and connecting the cavity to a flow path in which the blade is positioned, wherein: the outlet opening is of a nozzle-type des

1. A blade of a fluid-flow machine with at least one cavity positioned in the blade, with said cavity connecting to a fluid supply, and at least one outlet having an opening and connecting the cavity to a flow path in which the blade is positioned, wherein: the outlet opening is of a nozzle-type design and essentially inclined in a direction of a main flow extending longitudinally to a corresponding surface of the blade,the outlet opening extends over at least a part of the blade height, andthe outlet opening forms a step in the contour of the blade profile, with a fluid jet issuing from the outlet opening essentially tangentially attaching onto the surface;wherein the outlet is configured such that: a throat of the outlet is at or near the outlet opening,the outlet has, from the throat towards a blade interior, a cross-sectional width which continually increases over an entire effective length k, corresponding to a nozzle-type shape between beginning and ending diameter circle centers MI and ME. 2. The blade of claim 1, wherein the outlet opening extends over substantially an entirety of the blade height. 3. The blade of claim 1, wherein the outlet opening extends over a part of a width of an annulus, in which the blade is positioned. 4. The blade of claim 1, wherein the outlet opening extends over substantially an entirety of a width of an annulus, in which the blade is positioned. 5. The blade of claim 1, and further comprising at least one separator provided in an area of the outlet, with said separator at least one of dividing and deflecting the fluid flow supplied, before said fluid flow issues as a tangential jet onto the blade surface. 6. The blade of claim 1, and further comprising at least one separator provided in an area of the cavity, with said separator at least one of dividing and deflecting the fluid flow supplied, before said fluid flow issues as a tangential jet onto the blade surface. 7. The blade of claim 1, wherein the outlet opening is configured such that a jet direction of the issuing fluid at a location of the outlet opening and a direction of a main or boundary layer flow, respectively, at the blade profile include a shear angle φ which has values in the angular range −90°0.7,a mouth angle v included by tangent lines TGO and TGA lies in the value range 0°0.7,the mouth angle γ included by the tangents TGO and TGA lies in the value range 45°<γ<135°, where tangent line TGA and tangent line TGO describe a transition of the outlet into the surface of the blade, with TGA being tangent to point P on an inner outlet-confining contour, which point P is also tangential to a first circle defining the width e of the throat, and TGO being tangent at point X to a second circle through blade surface points X, Y and Z, where point X is an intersection of an orthogonal traced on TGA tangentially to the first circle, point Y is located at a distance of two throat widths (2e) upstream of point X, measured along a blade outer contour and point Z is located at a distance of two throat widths (2e) upstream of point Y, measured along the blade outer contour,a trailing edge protrusion depth j, relative to the throat width e, lies in a value range 0