Abstract:
A guide vane assembly (22) for controllably varying fluid mass flow rates past compressor blades (14) in an auxiliary power unit. The auxiliary power unit comprises a rotary apparatus (10) for compressing fluid in a compressor housing (12) wherein a plurality of compressor blades (14) are mounted on a rotating hub (16). A fluid flow path extends through the housing (12) which has a duct portion (18) extending upstream of the compressor blades (14) to an inlet plenum (20) to define at least a portion of the fluid flow path. The guide vane assembly (22) includes a central gear box (24) adjacent the compressor housing (12) which has a ring gear (26) mounted for limited rotational movement. A plurality of guide vanes (28) are disposed in the duct portion (18) of the housing (12) and are mounted for pivotal movement responsive to rotational movement of the ring gear (26). The guide vane assembly (22) is adapted to convert rotation of the ring gear (26) to pivotal movement of the guide vanes (28).
Abstract:
The problem of excessive weight in an aircraft (10) powered by at least one turbine engine (12) as a result of the incorporation of both a starter for the turbine engine (12) and a source of emergency power is avoided by utilizing a turbine wheel (62) to alternatively start the engine 12 or drive an emergency power generator (102). The turbine wheel (62) may be driven either by compressed air from a ground source (34) or an engine bleed (32) or, in the alternative, by hot gases of combustion from a stored energy source (36) in an emergency situation.
Abstract:
Improved starting for turbine engines operating at low fuel flows and at high altitudes is accomplished in an engine (10) having an annular combustor (12) by utilizing a stored energy combustion system (28) which includes a source of oxidant (36) and a fuel source (38) both of which are in fluid communication with an auxiliary combustion space (32) of an auxiliary combustor (30) for combusting the oxidant and fuel to generate a gaseous fuel including secondary gases of combustion which are directed to the annular combustor (12) through a fuel injector (24) as a reactive, gaseous fuel ignitable therewithin.
Abstract:
Ensemble d'aubes redresseuses (22) pour varier de manière commandée les taux de débit massique de fluide le long de pales de compresseur (14) dans une unité accessoire de propulsion. Cette dernière comprend un appareil rotatif (10) pour comprimer un fluide dans un logement de compresseur (12) où une pluralité de pales de compresseur (14) sont montées sur un moyeu rotatif (16). Une voie d'écoulement de fluide traverse le logement (12) dont une section est une conduite (18) qui se prolonge en amont des pales de compresseur (14) jusqu'à une chambre de mélange d'admission (20), délimitant ainsi une portion au moins de la voie d'écoulement du fluide. L'ensemble d'aubes redresseuses (22) comprend un train d'engrenage central (24) adjacent au logement du compresseur (12), comportant une couronne dentée (26) montée de manière à limiter le mouvement de rotation. Une pluralité d'aubes redresseuses (28) sont disposées dans la conduite (18) du logement (12) et positionnées de manière à pivoter en réponse au mouvement de rotation de la couronne dentée (26). L'ensemble d'aubes redresseuses (22) est conçu spécialement pour pouvoir convertir la rotation de la couronne dentée (26) en un mouvement de pivotement des aubes redresseuses (28).