Abstract: A system for reducing nitrogen oxide emissions from a gas turbine engine is disclosed in which a portion of air in the air compressor is tapped and supplied to an inlet which introduces at least a portion of the tapped air into the primary zone of the combustion chamber. A control device is disposed between the tap and the inlet to control the air flow passing to the inlet. The inlet is located so as to inject the tapped air into the combustion chamber primary zone at the intersection of adjacent fuel sprays. The control device, which may be an adjustable flap valve or a three-way valve, may also be operatively connected to the throttle control for the gas turbine engine such that the control allows the maximum amount of air to pass into the combustion chamber under full power conditions. The control device is preferably mounted outside the engine casing enclosing the combustion chamber to allow easy access for assembly and maintenance.

Abstract: An improved swirler system for a turbojet engine combustion chamber is disclosed in which stationary first vanes and moveable second vanes are oriented at different angles with respect to a radius of the fuel injector system. The different angles allow the angle of the incoming air to be adjusted between full power and idle conditions so as to vary the conial shape of the atomized air-fuel mixture according to the operating conditions of the engine. Radial and axial inlet duct portions serve to attenuate the wakes of the air flow generated by the vanes prior to the air passing into the combustion chamber.

Abstract: A fuel system for a turbojet engine is disclosed in which the operating parameters of the engine are improved throughout the range of engine operating conditions. The fuel system includes an enlarged intermediate bowl for the combustion chamber which increases the reactive volume, while at the same time provides sufficient cooling of the bowl to avoid burn-through or uneven engine operating characteristics. The bowl extends radially outwardly beyond an opening in the base of the combustion chamber and defines a row of air inlet orifices which serves to more completely atomize the fuel prior to its ignition. A diaphragm control system may also be utilized to control the amount of air flowing into the bowl as the engine speed changes.

Abstract: A swirler for a gas turbine fuel injection apparatus is disclosed in which the intake air is directed both axially and radially to maximize the efficiency of the gas turbine during all modes of operation. Circumferentially alternating axial and radial passages are defined by the swirler member surrounding the fuel injection nozzle. A diaphragm control is provided to selectively control the amount of air passing through the axial and radial passages, depending upon the operational mode of the gas turbine.

Abstract: A system is disclosed for controlling the flow of air through the air-fuel mixing device for a turbojet engine. The system simultaneously controls the amount of air passing through turbulence generating baffles and that passing into the combustion chamber depending upon the operating conditions of the turbojet engine.

Abstract: The invention relates to a variable area nozzle for a turbo-jet engine. This nozzle comprises a convergent portion, formed by a fixed semi-shell (2) and a semi-shell (3) pivotal about a diametral axis (4a-4b); the fluid-tightness of the convergent portion is ensured by a substantially semi-circular seal (6) and by two longitudinal seals (7a, 7b). The nozzle can be used for example with an engine comprising a partial re-heat system of moderate output.

Abstract: An open ended enclosure has a tubular conduit extending axially within it d is provided with both an electric spark plug and a catalytic ignition member in the annular region of the enclosure outside the tubular conduit.

Abstract: A flame holder device of the type having a flame holder ring with a contius cross section of revolution in the shape of a U or V, and a plurality of flame holder arms having a continuous cross section in the shape of a U or V and radiating from one of the flanks of the ring. According to the invention, each arm is attached to the ring by means of gussets which provide for a slight spacing of the arm from the ring in order to prevent local overheating of the ring due to the recirculation of combustion gases.