Combined bleed valve and annular diffuser for gas turbine...

F - Mech Eng,Light,Heat,Weapons – 04 – D

Patent

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Details

F04D 27/02 (2006.01) F01D 17/10 (2006.01) F02C 9/18 (2006.01) F04D 29/08 (2006.01)

Patent

CA 2199875

A multi-spool gas turbine engine of the type having an annular inter compressor duct connecting a low pressure compressor to a further compressor stage, and having improved bleed means for bleeding off a variable amount of air from the duct when the engine is being operated at partial load. The bleed means comprises opening means arranged circumferentially around the outer wall of the duct, and pivotally mounted air deflectors for deflecting air flowing in the duct outwardly through the openings in the outer wall of the duct. In accordance with the invention, the air deflectors are flaps forming a circumferential array, and sealing elements are provided movable with the flaps and interconnecting the side edges of adjacent flaps to largely prevent radial flow of air between adjacent flaps.

La présente invention concerne un moteur à turbine à gaz à plusieurs étages comportant un conduit inter-compresseur reliant un compresseur basse pression à un étage compresseur suivant. Ce moteur présente un perfectionnement de l'organe de purge (161) permettant de purger le conduit d'une quantité variable d'air lorsque le moteur fonctionne à charge partielle. L'organe de purge (161) comporte, d'une part un dispositif d'ouverture disposé en périphérie de la paroi externe du conduit, et d'autre part des déflecteurs d'air articulés (161) détournant vers l'extérieur le flux d'air intérieur du conduit, au travers d'ouvertures dans la paroi externe du conduit. Selon la présente invention, les déflecteurs d'air sont des volets (161) formant un alignement circonférentiel, des éléments d'obturation étanches suivant le mouvement des volets et reliant les rives latérales de volets consécutifs (161) de façon à empêcher l'écoulement radial de l'air entre des volets consécutifs.

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