摘要:
An oil cooling system and method are provided for use with respect to a lubricated mechanical system within a bypass configured gas turbine engine. A surface cooler is fluidly linked to the lubricated mechanical system to receive oil from the lubricated mechanical system for cooling and reuse. In an embodiment, the surface cooler is mounted on an existing surface within the bypass airflow path of the bypass configured gas turbine engine to provide effective cooling while avoiding the introduction of additional aerodynamic disturbances in the bypass path. In an embodiment, the surface cooler is mounted on the fan casing or on a fan exit guide vane.
摘要:
A gas turbine engine comprises a fan drive gear system, a low spool connected to the fan drive gear system, and a high spool disposed aft of the low spool. The low spool comprises a rearward-flow low pressure compressor disposed aft of the fan drive gear system, and a forward-flow low pressure turbine disposed aft of the low pressure compressor. The high spool comprises a forward-flow high pressure turbine disposed aft of the low pressure turbine, a combustor disposed aft of the high pressure turbine, and a forward-flow high pressure compressor disposed aft of the combustor.
摘要:
The after-burner device receives a “hot” central primary flow from the turbine of the turbojet and a “cold” peripheral secondary flow, and it has an after-burner ignition zone situated in the secondary flow that reaches the after-burner device. A fraction of the primary flow is brought into the after-burner ignition zone in order to raise the temperature in said zone to a value that is higher than that of the secondary flow so as to encourage after-burner ignition.
摘要:
A flow control system for inverting the positions of two adjacent constant area flow patterns within the confines of a fluid passageway having an area substantially equal to the combined area of the two separated flow patterns. The preferred embodiments involve annular first and second duct means divided into duct elements shaped and arranged such that two annular flow patterns are discharged at the exit end of the passageway in an inverted adjacent concentric relationship to that which exists at the entrance end of the passageway. Valve embodiments for optionally causing either inverted or straight through flow are also presented.
摘要:
A heat exchange module is provided for a turbine engine. The heat exchange module includes a duct and a plurality of heat exchangers. The duct includes a flowpath defined radially between a plurality of concentric duct walls. The flowpath extends along an axial centerline through the duct between a first duct end and a second duct end. The heat exchangers are located within the flowpath, and arranged circumferentially around the centerline.
摘要:
A fuel heat management system including a fuel line for conveying fuel, and a fuel/oil heat exchanger which receives fuel flowing through the fuel line. The fuel heat management system further comprises an oil line for circulating oil from an engine oil system to the fuel/oil heat exchanger and back to the engine oil system. The fuel/oil heat exchanger brings the oil and the fuel into heat exchange relationship. The fuel heat management system further includes an air/oil heat exchanger which receives oil flowing through the oil line, the air/oil heat exchanger bringing the oil and air into heat exchange relationship. The fuel heat management system further includes an air/fuel heat exchanger which receives fuel flowing through the fuel line, the air/fuel heat exchanger bringing the fuel and air into heat exchange relationship.
摘要:
A mixer arrangement for a bypass type gas turbine engine is disclosed. The mixer is convoluted and generally annular and defines radially and axially extending first and second chutes adapted to receive, respectively, a hot gas stream from the engine core and a cooler gas stream from the fan duct. A pre-mixer is disposed upstream of the mixer and is also convoluted and is aligned in flow communication with the second chutes of the mixer such that the hot gas stream received by the pre-mixer is mixed with the cooler fan air stream received by the second chutes to raise the temperature of the fan air entering an afterburner section of the engine.
摘要:
The invention relates to a propulsion engine, particularly for supersonic aircraft. An internal propulsion system comprises an envelope displaying a tapered center portion, around which is coaxially mounted an external propulsion system which lacks a separate compressor. According to the invention, mechanisms are provided to divert toward the combustion chamber of the external propulsion system an adjustable fraction of the compressed air arriving from the last compressor stage of the internal propulsion system. A blower which is driven by the external turbine exhausts in parallel with the latter into an annular conduit which emerges between the internal nozzle and external nozzle and an exhaust nozzle, all of these nozzles being of variable geometry. The purpose of the invention is to improve variable cycle propulsion engines for second-generation supersonic aircraft.
摘要:
Air breathing gas turbine engine design concepts, and methods and apparatus for providing variable engine cycles are disclosed. The preferred engine embodiments involve two flow control valve systems for internal management of air, each of which have the capacity to cross-over or invert adjacent annular flow patterns, and at least one of which is capable of switching from inverted to straight through flow.
摘要:
Air breathing gas turbine engine design concepts, methods and apparatus for providing variable bypass and variable engine cycles. The disclosed preferred embodiments involve flow control systems for internal management of air within the engine which have a capability to crossover or invert adjacent annular flow patterns without interference, necking down, or departure from the confines of an annular passageway, and which may be switched from inverted to straight through flow.