摘要:
Die Erfindung betrifft eine Einlaufstruktur (10) für eine Strömungsmaschine (40), welche dazu ausgebildet ist, beim Betrieb der Strömungsmaschine (40) durch wenigstens ein Einlaufelement (44, 47) der Strömungsmaschine (40) zumindest teilweise verformt und/oder zumindest teilweise abgetragen zu werden, wobei die wenigstens eine Einlaufstruktur (10) zumindest bereichsweise aus Strukturelementen (12, 14, 16, 18) gebildet ist, welche einen jeweiligen, in einer Anstreifrichtung (X_A) der Einlaufstruktur (10) ausgerichteten Polygonquerschnitt (20, 22) aufweisen. Die Strukturelemente (12, 14, 16, 18) weisen in der Anstreifrichtung (X_A) eine größere Erstreckung (X h , X r ) auf, als in einer, zu der Anstreifrichtung (X_A) senkrechten Richtung der Einlaufstruktur (10). Weitere Aspekte der Erfindung betreffen eine Strömungsmaschine (40) mit einer Einlaufstruktur (10) sowie ein Verfahren zum Herstellen einer Einlaufstruktur (10).
摘要:
The present invention relates to an improved cast-to-size gas turbine blade comprising a blade tip shroud (5) with a stiffening rib (14) extending outwardly from the section of the outer side (8) of the shroud platform (6) located between the upstream sealing fin (13) and the upstream edge (10). The stiffening rib (14) having substantially planar top surface (15) in form of a trapezium, and two sloping sidewalls (16) extending between the upstream sealing fin (13) and the upstream edge (10) on each side of the top surface (15) and connecting said top surface (15) with adjacent surface of the outer side (8) of the shroud platform (6). The form of the stiffening rib (14) allows to obtain an improved shroud configuration of reduced overall blade mass, capable of providing sufficient stiffening of the shroud (5), reducing vibrations of the shroud platform (6), creep curling of the shroud edges and bending stress at the intersection of the airfoil (4) and of the shroud (5). Further, the stiffening rib (14) is suitable for being manufactured with sufficient precision directly in casting process, thereby elimination expensive machining of the shroud to arrive at tight tolerances.
摘要:
An airfoil (1) having one-sided pedestals (131) is disclosed. The airfoil (1) defines various cavities, such as an inflow feed cavity (110), an impingement cavity (130), and an outflow cavity. The various cavities are connected by crossover sections (120, 140) such as an inflow crossover section (120) and an outflow crossover section (140). Cooling air is conducted into the inflow feed cavity (110) and then out of the inflow feed cavity (110) through an inflow crossover section (120) into an impingement cavity (130), and through an impingement cavity (130). The cooling air may be conducted out of the impingement cavity (130) and into an outflow cavity through an outflow crossover section (140). Various cavities include one-wall pedestals (131). One-wall pedestals (131) are structures extending from a wall of a cavity into the void of the cavity, whereupon cooling air may impinge, effectuating convective cooling. A corresponding method of making such an airfoil is also provided.
摘要:
A ribbed composite shell (1 10) includes an annular grid (1 12) of relatively thick crack arresting ribs (1 14) embedded in a relatively thin annular shell (120) and relatively thin panels (1 18) in thin annular shell (120) between arresting ribs (114) wherein each of panels (1 18) are completely surrounded by a set (122) of relatively thick adjoining ones of ribs (116). A shell forward flange (54) may extend radially inwardly from thin annular shell (120). Arresting ribs (1 14) may include radially stacked layers of strips (126) between radially stacked annular layers (128) of shell (110). Annular grid (1 12) may include a rectangular grid pattern (138), a diamond grid pattern (148), or a hexagonal grid pattern (158). A nacelle inlet (25) may have the ribbed composite shell (1 10) within one or both of radially spaced apart composite inner and outer skins (60, 62) of an inner barrel (40). Nacelle inlet (25) may be part of attached to a fan casing (16) and axially disposed forward of fan blades (18) circumscribed by the casing (16). The inlet (25) may be on an engine nacelle.
摘要:
The present invention relates to a variable exhaust nozzle (14) for a jet engine (1), the nozzle (14) comprises an upstream portion (16), flap means (18) being pivotally connectable to the jet engine (1) via the upstream portion (16), the flap means (18) com- prises a downstream portion (16´) forming a downstream linear edge (19'), actuator means (20, 20h, 24) being arranged to actuate said flap means (18) for variation of the nozzles (14) cross sectional area (A1, A2) between a first position and a second position. Said flap means (18) is skewed. The nozzle (14) comprises shape forming flap means (24, 62) for forming the cross sectional area (A1, A2), and adjacent flap means (24, 26, 27, 28) having sliding surfaces (22, 22') in continuous contact during said variation. The present invention also relates to method for varying a variable exhaust nozzle (14) for a jet engine (1).
摘要:
Die Erfindung betrifft eine Düse mit einer Düsenmantelfläche (4) und einem Düsenrand (9), an dem in Umfangsrichtung abwechselnd erste und zweite Leitvorrichtungen (10, 20) angeordnet sind, wobei die ersten Leitvorrichtungen (10) düsenartig ausgebildet und die zweiten Leitvorrichtungen (20) diffusorartig ausgebildet sind. Die ersten Leitvorrichtungen (10) umfassen jeweils eine erste azimuthale Leitwand (11) und zwei Wandelemente (30), wobei die erste azimuthale Leitwand (11) eine erste Abströmkante (12) und zwei erste Kanten (13) zu den Wandelementen (30) ausbildet. Die zweiten Leitvorrichtungen (20) umfassen jeweils eine zweite azimuthale Leitwand (21) und zwei Wandelemente (30) umfassen, wobei die zweite azimuthale Leitwand (21) eine zweite Abströmkante (22) und zwei zweite Kanten (13) zu den Wandelementen (30) ausbildet. Ein Wandelement (30) verbindet eine erste Leitvorrichtung (10) und eine zweite Leitvorrichtung (20). Erfindungsgemäß ist vorgesehen, dass die Wandelemente (30) in axialer Richtung einen gekrümmten Verlauf besitzen.
摘要:
A rotor stage of a turbine has a rotational axis (XX), a shroud (35) and radially inward thereof a turbine blade (32) defined partly by a pressure side wall (38), a suction side wall (37) and a tip portion (46). The tip portion (46) has a pressure side tip rib (70) and a tip cavity floor (74) defining a tip cavity (76). The pressure side tip rib has a width W ps , a height H ps above the tip cavity and defines a tip gap G ps with the shroud. The pressure side tip rib has a sloping side (78) joining the tip cavity floor and having an angle α ps to a radial line ZZ. The width W ps is in the range G ps to 5G ps , the height H ps is in the range 5G ps to 15G ps and the angle α ps is in the range 20° to 70°.