Abstract:
Die Erfindung betrifft eine Turbinenlaufschaufel (10) für eine thermische Strömungsmaschine, bei der entlang einer gedachten Schaufellängsachse (12) der Turbinenlaufschaufel (10) von unten nach oben einem Schaufelfuß (14) zur Befestigung der Turbinenlaufschaufel (10) an einem Rotor der Turbine ein Übergangsbereich (16) sowie ein sich daran anschließendes aerodynamisch gekrümmtes Schaufelblatt folgt, wobei der Schaufelfuß (14) zwei einander gegenüberliegende ebene Stirnflächen (26, 28) und zwei einander gegenüberliegende, die beiden Stirnflächen miteinander verbindende konturierte Seitenflächen (30, 32) aufweist, in welchen Seitenflächen (30,32) unter Bildung einer Schwalbenschwanz- oder tannenbaumförmigen Stirnflächenkontur jeweils zumindest eine Tragflanke (34) ausgebildet ist, und bei der die Tragflanken (34) über konkave Verrundungen (36) in den Übergangsbereich oder zu Freiflanken übergehen. Um eine Turbinenlaufschaufel bereitzustellen, deren Verwendung in einem Schaufelträger die Lebensdauer des Turbinenlaufschaufelträgers verlängert, wird vorgeschlagen, dass in zumindest einer konkave Verrundung (36) eine an eine der beiden Stirnseiten (26, 28) angrenzende Auskehlung (38) angeordnet ist, deren Erstreckung längs der Seitenfläche (30 bzw. 32) geringer ist als die der Tragflanke (34).
Abstract:
Die Erfindung betrifft eine Turbinenschaufel (1) mit einem Turbinenschaufelblatt (3), in welchem ein Hohlraum (5) ausgebildet ist, welcher von einem Rippenelement (15) unterteilt ist, dessen Rippenhöhe (25) sich von einer Vorderseitenwand (6) des Turbinenschaufelblatts zu einer Hinterseitenwand (7) des Turbinenschaufelblatts (3) erstreckt, wobei der Rippenquerschnitt (35) des Rippenelements (15) derart ausgestaltet ist, dass das Rippenelement (15) in Richtung (32) der Rippenhöhe (25) zumindest teilweise bogenförmig ausgestaltet ist, so dass die durch thermische Differenzen zwischen der Vorder- und Hinterseitenwand (6, 7) innerhalb des Rippenelements (15) hervorgerufene Spannungen mittels eines verbesserten Verformungsvermögens des Rippenelements (15) kompensierbar sind, wobei das Rippenelement (15) in Richtung (32) der Rippenhöhe (25) eine Querschnittschwächung aufweist, welche sich in Richtung der Mittellängsachse (31) des Turbinenschaufelblatts (3) erhöht, um das Verformungs- und/oder Biegevermögen des Rippenelements zu erhöhen.
Abstract:
An assembly for a turbine engine is provided. This turbine engine assembly includes a shell and a heat shield with a cooling cavity between the shell and the heat shield. The heat shield defines a plurality of cooling apertures and an indentation in a side of the heat shield opposite the cooling cavity. The cooling apertures are fluidly coupled with the cooling cavity. The indentation is configured such that cooling air, directed from a first of the cooling apertures, at least partially circulates against the side of the heat shield.
Abstract:
An airfoil array is disclosed. The airfoil array may include an endwall, and a plurality of airfoils radially projecting from the endwall. Each airfoil may have a first side and an opposite second side extending axially in chord between a leading edge and a trailing edge. The airfoils may be circumferentially spaced apart on the endwall thereby defining a plurality of flow passages between adjacent airfoils. The airfoil array may further include a convex profiled region extending from the endwall near the leading edge of at least one of said plurality of airfoils, and a concave profiled region in the endwall near a middle of at least one of said plurality of flow passages.
Abstract:
An airfoil array is disclosed. The airfoil array may include an endwall, and a plurality of airfoils radially projecting from the endwall. Each airfoil may have a first side and an opposite second side extending axially in chord between a leading edge and a trailing edge. The airfoil array may further include a convex profiled region extending from the endwall adjacent the first side of at least one of said plurality of airfoils and near the leading edge of the at least one of said plurality of airfoils. The airfoil array may further include a concave profiled region in the endwall adjacent the first side of said at least one of said plurality of airfoils and aft of the convex profiled region.
Abstract:
An airfoil array is disclosed. The airfoil array may include an endwall, and a plurality of airfoils radially projecting from the endwall. Each airfoil may have a first side and an opposite second side extending axially in chord between a leading edge and a trailing edge. The airfoil array may further include a convex profiled region extending from the endwall adjacent the first side of at least one of said plurality of airfoils and near the leading edge of the at least one of said plurality of airfoils. The airfoil array may further include a concave profiled region in the endwall adjacent the first side of said at least one of said plurality of airfoils and aft of the convex profiled region.
Abstract:
In accordance with the invention there is provided turbine arrangement, particularly a gas turbine arrangement, comprising at least one rotor blade (2) and a turbine disc (5), the rotor blade (2) comprising a root portion (1), the turbine disc (5) comprising at least one slot (40) in which the root portion (1) of the rotor blade (2) is secured. The slot (40) comprises a plurality of opposite pairs of slot lobes (100) and a plurality of opposite pairs of slot fillets (101), and a slot bottom (105) of the slot (40). The slot bottom (105) is arranged to comprise a first convex surface section (102). Furthermore the root portion (1) of the rotor blade (2) comprises a root bottom (50) comprising a first concave surface section (51) corresponding to the first convex surface section (102) of the slot bottom (105). Additionally, the first convex surface section (102) is pierced by an outlet (44) of a cooling duct (42) through the turbine disc (5).
Abstract:
The subject of the invention is an aircraft nacelle comprising a duct (36) through which a stream of gas flows, said duct (36) being delimited by two substantially concentric walls, an internal one (40) and an external one (42), coated at least partly by a coating designed to absorb a part of the acoustic energy and at least one partition (38, 38') extending over at least part of the length of the duct (36) between said internal and external walls (40, 42) where the profile of at least one wall (44, 46) of said at least one partition (38, 38') is defined in such a way as to increase the number of times that an acoustic beam is reflected onto the coating designed to absorb a part of the acoustic energy.
Abstract:
Variable nozzle (10) for a gas turbine fixed to a shaft (11) equipped with a pressurized upper surface (12) and a depressurized lower surface opposite to the upper surface (12), the variable nozzle comprises a series of substantially "C"-shaped sections, each having a first rounded end and a second rounded end each section of the series of sections also having the concavity facing upwards with respect to a base (90) and arranged one after another continuously, in the direction of an axis of the shaft (11) along a curved line (60), the at least second degree curved line (60) lies on a surface (70) having an axis orthogonal to the axis of the shaft (11) and also tilted with respect to the base (90) by an angle (80).