Abstract:
Described is a propulsion system (1) for hypersonic aircraft, having an air inlet (10) of a fluid (110), a containment duct (20) and an exhaust nozzle (30). The propulsion system (1) comprises a bypass duct (40) for a flow (100) of fluid (110), an air-breathing engine (22) and a rocket (23) configured for processing respective flows (22a, 23a) of fluid (110). The bypass duct (40), the air-breathing engine (22) and the rocket (23) are operatively associated with each other in such a way as to generate a thermodynamic-fluid interaction in a same portion of space (33) between the respective flows (40a, 22a, 23a) processed in an operating configuration of the propulsion system (1) and wherein the portion of space (33) is inside the containment duct (20).
Abstract:
A disclosed gas turbine engine includes a compressor section including a first compressor disposed axially forward of a second compressor, a combustor in fluid communication with the compressor section and a turbine section in fluid communication with the combustor. The turbine section includes a first turbine driving the first compressor and a second turbine driving the second compressor. An inner shaft defines a driving link between the second compressor and the second turbine and an outer shaft defines a driving link between the first compressor and the first turbine. The inner shaft and the outer shaft are concentric about a common axis of rotation. A bumper is disposed on the inner shaft within an axial region common to an aft portion of the outer shaft for accommodating interaction between the inner and outer shafts during high load conditions.
Abstract:
The invention relates to a method for operating a rocket engine, which method makes it possible to provide single-stage carrier rockets that achieve an optimal thrust and a maximum specific impulse over the combustion duration of the engine. The invention further relates to a rocket engine that allows the method according to the invention to be carried out. In the method according to the invention, at least one hydrocarbon is reacted with oxygen in a first combustion chamber of the rocket engine and hydrogen is reacted with oxygen in a second combustion chamber of the rocket engine. The reaction in the first combustion chamber is maintained until the hydrocarbon is consumed; the reaction in the second combustion chamber is continued until the hydrogen is consumed. The fuel amounts are selected so that the hydrocarbon is consumed earlier than the hydrogen. The rocket engine, designed as a plug nozzle engine, for carrying out the method comprises a main body (1), at the lower end of which a central cone (2) (plug nozzle/spike) is connected, wherein the main body (1) is surrounded by a first annular combustion chamber (3.1), which has a first annular throat nozzle (6.1), and a second annular combustion chamber (3.2) having a second annular throat nozzle (6.2) is located in the central cone (2).
Abstract:
A tip turbine engine (40) provides a peripheral combustor (30) with a more efficient combustion path through the combustor and through the tip turbine blades (34) . In the combustor, the core airflow is received generally axially from compressor chambers in hollow fan blades (28) and then turned radially outwardly into a combustion chamber (112) , where it is then mixed with the fuel and ignited. The combustor has a combustion path extending axially from a forward end of its combustion chamber through a combustion chamber outlet (122) and through a turbine (32) mounted to the fan. Thus, when the core airflow begins to expand in a high-energy gas stream, it has a substantially axial path from the combustion chamber through the turbine.
Abstract:
Ein Abgasturbolader für eine Brennkraftmaschine weist eine Turbine im Abgasstrang und einen von der Turbine angetriebenen Verdichter im Ansaugtrakt der Brennkraftmaschine auf, wobei die Turbine einen Strömungskanal mit einem radialen Strömungseintrittsquerschnitt besitzt und ein den Strömungseintrittsquerschnitt begrenzender Strömungsring vorgesehen ist. Im radialen Strömungseintrittsquerschnitt ist ein verstellbares Leitgitter zur veränderlichen Einstellung des Strömungseintrittsquerschnitts angeordnet. Der Strömungsring im Gehäuse der Abgasturbine ist axial zwischen einer Kontaktposition zum Leitgitter und einer einen Spalt zum Leitgitter freigebenden Position verschiebbar.
Abstract:
Aéronef comportant un fuselage (1) et propulsé par une turbomachine à deux soufflantes coaxiales, respectivement amont (7) et aval (8), entraînées par deux rotors (5, 6) contrarotatifs d'une turbine de puissance (3), les deux soufflantes (7, 8) et la turbine (3) étant intégrées dans une nacelle (14) à l'aval du fuselage (1), dans le prolongement de celui-ci, et dans laquelle circule un écoulement d'air; au moins une des soufflantes (7, 8) de l'aéronef, et en particulier la soufflante aval (8), comporte des aubes à calage variable et dans l'aéronef au moins une couronne d'aubes (25) à calage variable formant un stator est placée en amont de la soufflante amont (7), les aubes de stator (25) à calage variable et les aubes à calage variable de la soufflante aval (8) étant configurées mutuellement pour orienter l'écoulement d'air dans un premier mode où l'air circule dans la nacelle (14) de l'amont vers l'aval et dans un second mode où l'air est refoulé dans la nacelle (14) vers l'amont.
Abstract:
A gearbox oil cooling assembly for a gearbox driving a drive shaft having a drive shaft coupling. The assembly includes a heat exchanger to receive and cool an oil from the gearbox and having an inlet. Also included is an impeller axially disposed between the heat exchanger and the drive shaft coupling, wherein the impeller is operatively coupled to, and rotated by, the drive shaft operatively coupled to the drive shaft coupling. Further included is an exhaust duct operatively coupled to the heat exchanger and disposed radially outwardly around the impeller and defining an airflow pathway through which air passes through the inlet, the impeller and through the exhaust duct according to the rotation of the impeller to cool the oil in the heat exchanger.
Abstract:
A fan blade comprises a main body having an airfoil extending between a leading edge and a trailing edge. The fan blade has at least one of a channel closed by a cover, and an end cap covering at least one of the leading and trailing edges. At least one of a cover and an end cap has a pair of opposed ends. A step is defined extending from at least one of a suction wall and a pressure wall of the airfoil, to an outer surface of the one of a cover and an end cap at one of the opposed ends, and the step being less than or equal to about 0.010 inch (0.0254 centimeter) in dimension.
Abstract:
An airfoil for a turbine of a gas turbine engine is provided. The airfoil comprises a main body comprising a wall structure defining an inner cavity adapted to receive a cooling air. The wall structure includes a first diffusion region and at least one first metering opening extending from the inner cavity to the first diffusion region. The wall structure further comprises at least one cooling circuit comprising a second diffusion region and at least one second metering opening extending from the first diffusion region to the second diffusion region. The at least one cooling circuit may further comprise at least one third metering opening, at least one third diffusion region and a fourth diffusion region.
Abstract:
An exhaust system for an aircraft has a primary exhaust duct for communicating exhaust gas from an engine exhaust exit and is configured for movement with the engine. A secondary exhaust duct is in fluid communication with the primary exhaust duct and is movably mounted to the airframe. The system has means for maintaining a generally consistent relative alignment between the primary duct and the secondary duct.