Abstract:
A gas turbine engine (202) including a secondary fuel stage (218) which also functions as a dual frequency resonator. The engine includes a combustor (210) and a casing (205) enclosing the combustor to define a volume (214). The secondary fuel stage includes a nozzle (217) sized to be effective as a transverse resonator at a high frequency. The nozzle and the volume (214) of the casing are sized to be effective as a longitudinal resonator at an intermediate frequency.
Abstract:
L'invention concerne un dispositif d'injection(1) de carburant multipoint pour moteur (M) d'aéronef, comprenant une voie d'entrée (10), au moins deux voies d'injection (11, 12), et une voie de purge (14), un organe distributeur (2) de carburant connecté à chaque voie et comprenant un élément mobile (22) qui comporte un passage d'injection (223), dans lequel l'élément mobile (22) comporte en outre un passage de purge (226), et est configuré pour adopter une première plage de positions dans lesquelles le passage d'injection (223) interconnecte la voie d'entrée (10) et les voies d'injection (11, 12), et une deuxième plage de positions dans lesquelles le passage d'injection (223) interconnecte la voie d'entrée (10) et au moins une première voie d'injection (11) tandis que le passage de purge (226) interconnecte la voie de purge (14) et au moins une deuxième voie d'injection (12), le dispositif étant caractérisé en ce qu'il comprend en outre un actionneur adapté pour déplacer l'élément mobile dans une position de sécurité lors de la détection d'une défaillance de l'organe de distribution, le passage d'injection (223) interconnectant, dans cette position de sécurité de l'élément mobile (22), la voie d'entrée (10) et la première voie d'injection (11) tandis que le passage de purge (226) n'interconnecte la voie de purge (14) à aucune des voies d'injection (12).
Abstract:
A combustor apparatus defining a combustion zone where air and fuel are burned to create high temperature combustion products. The combustor apparatus comprises an outer wall including a fuel inlet opening for receiving a fuel feed pipe. A coupling assembly is engaged with the fuel feed pipe at the fuel inlet opening to attach the fuel feed pipe to the outer wall. A fuel injection system is located in the interior volume of the outer wall and comprises fuel supply structure including a fuel feed block having a fuel intake passage aligned with the outlet portion of the fuel feed pipe. A coupling fastener is engaged against an exterior outer face of the fuel feed block to create a sealed coupling for containing fuel passing from the fuel feed pipe into the fuel feed block, and to secure the fuel feed block relative to the coupling assembly.
Abstract:
The present invention discloses a novel apparatus and method for a mixing fuel and air in a gas turbine combustion system. The mixer helps to mix fuel and air while being able to selectively increase the fuel flow to a shear layer of a pilot flame in order to reduce polluting emissions. The mixer directs a flow of air radially inward into the combustion system and includes two sets of fuel injectors within each radially-oriented vane (320). A first plurality of fuel injectors (322) operate independent of a second plurality of fuel injectors (324) and the second plurality of fuel injectors are positioned to selectively modulate the fuel flow to the shear layer of the resulting pilot flame.
Abstract:
The present invention discloses a novel apparatus and way for altering the airflow to a gas turbine combustion system. The apparatus comprises a flow divider mechanism which splits the airflow surrounding a combustion liner into two distinct portions, one directed towards a pilot and one directed towards a main stage combustion. The flow divider mechanism is interchangeable so as to provide a way of altering airflow splits between stages of the combustion system.
Abstract:
A fuel system for a gas turbine engine includes a plurality of duplex nozzles arranged on each side of top dead center and a plurality of simplex nozzles. A primary manifold is operable to communicate fuel to a primary flow jet in each of the plurality of duplex nozzles and a secondary manifold is operable to communicate fuel to a secondary flow jet in each of the plurality of duplex nozzles and a secondary flow jet in each of the plurality of simplex nozzles. An equalizer valve that is in communication with both the primary manifold and the secondary manifold distributes fuel at various pressures to both the primary and secondary manifolds.
Abstract:
The invention relates to a mixing arrangement for mixing a fuel (13, 15) with a stream of oxygen containing gas flowing along an axis (16) in an axial channel, especially in the second combustor of a gas turbine with sequential combustion. The mixing is improved and the mixing length reduced by said mixing arrangement comprising an injector (10) with at least one injector ring (11), which is passed by said stream of gas inside and outside.
Abstract:
The invention relates to a burner (B) of a gas turbine extending along an axis (X) and comprising in axial order - a swirler section (SW) - a mixing section (MX) - an outlet section (OT) - a main combustion zone (CZ) - wherein said swirler section (SW) comprises swirler vanes (SWV) made to swirl a stream of fuel (F) and oxygen containing gas (OCG) entering the swirler section (SW) in a circumferential direction, - wherein said mixing section (MX) conducts the premix (MFOCG) of fuel (F) and oxygen containing gas (OCG) to said outlet section (OT), - wherein said outlet section (OT) discharges said premix (MFOCG) into said combustion zone (CZ) expanding the flow of premix (MFOCG) from a smaller axial cross section of said mixing section (MX) to a larger cross section of said combustion zone (CZ) which makes streamlines of said flow to diverge radially. The improve stability a surface of the outlet section (OT) facing the flow of said premix (MFOCG) is provided with first fuel nozzles (FN1) injecting fuel into said premix (MFOCG) into a radial inwardly inclined direction be- fore the flow of said premix (MFOCG) enters said outlet section (OT) into said combustion zone (CZ).
Abstract:
The combustion device (5) comprises a burner (10), a combustion chamber (11) downstream of the burner (10), a lance (14) projecting into the burner (10) for fuel and air injection, a plenum (20, 27) that at least partly houses the burner (10). The plenum (20, 27) is connected to the inside of the lance (14) to supply an oxidiser to it.
Abstract:
It is described a combustion device control unit and a combustion device, e.g. a gas turbine, which determine on the basis of at least one operating parameter whether the combustion device is in a predefined operating stage. In response hereto, there is generated a control signal configured for setting a ratio of at least two different input fuel flows to a predetermined value (psc1, psc3) for a predetermined time (dt) in case the combustion device is in the predefined operating stage.