摘要:
A method for controlling a pressure control mechanism in a turbofan engine having a precooler permitting heat exchange between ambient air and bleed air includes detecting at least one of an engine failure or a bleed system failure, detecting at least one of an ice condition or an activation of an anti-ice system, and actuating the pressure control mechanism, thereby altering the heat exchange between the ambient air and the bleed air.
摘要:
The invention provides a bleed air system (1) of an engine and a method for controlling the temperature of a bleed air flow in said bleed air system. The method comprising the steps of: sensing a duct temperature in the bleed air duct (2) downstream the pre-cooler (4), sensing an ejector pressure in an ejector valve, measuring the flap position, establishing a target value in terms of temperature variation, setting the operation of the bleed air system in either a first mode where the control means actuate on the actuator, or in a second mode, where the control means actuate on the ejector valve, calculating a new target value, which in the event the bleed air system is operating in the first mode, the new target value is a target flap position and in the event the bleed air system is operating in the first mode, the new target value is a target ejector pressure, and actuating either on the actuator or on the ejector valve so that the flap or the ejectors acquires the new target value.
摘要:
A method for recovering air in an aircraft includes bleeding bypass air (122;196) from an engine bypass (76;152), bleeding core air (120;194) from an engine core (74;150), and placing the bypass air and the core air in a heat exchange relationship to produce heated bypass air (126;200) and cooled core air (124;198). The method further includes directing the heated bypass air to one or more of: the engine bypass (76), a cowl (149) de-icing system, and a wing (206) anti-ice system.
摘要:
A heat exchanger (HEX) arrangement for cooling air in a gas turbine engine (110) is provided. The HEX arrangement includes a heat exchanger (400; 502; 802) coupled to a plurality of ducts (506) comprising a hot-side inlet duct (512) and a hot-side outlet duct (514, 516, 518). The hot-side outlet duct (514, 516, 518) receives air from a compressor section (224) and is connected to a diffuser case (542). The HEX arrangement includes a plurality of supporting links (520, 522, 524; 804) coupled between the heat exchanger (400; 502; 802) and the gas turbine engine (110). The supporting links (520, 522, 524; 804) may comprise a statically determined system. A spring rate ratio of between 1% and 30% exists between the plurality of ducts (506) and the plurality of supporting links (520, 522, 524; 804).
摘要:
A heat exchanger (102) for use in a gas turbine engine has a central body including an inlet manifold (126) and at least one tube providing an outlet manifold (128), and a plurality of tubes communicating holes (133) in an outer periphery of the inlet manifold (126) to holes (131) in an outer periphery of the outlet manifold (128), and passages for cooling air to pass across the tubes.
摘要:
A heat exchanger system (1100) includes a first heat exchanger assembly (200) including a plurality of airfoil members (202) circumferentially spaced in a flow stream (156) of an annular duct (150). Each airfoil member (202) including a radially inner end (204) and a radially outer end (206) and a first internal flowpath (208) configured to channel a flow of cooled fluid therethrough. The heat exchanger assembly includes a second heat exchanger assembly (300) including a plurality of fin members extending proximate the flow stream (156) and a second internal flowpath (306) configured to channel a flow of cooled fluid therethrough. The heat exchanger assembly includes a header system (1108) including a conduit path configured to couple the first heat exchanger assembly (200) and the second heat exchanger assembly (300) in flow communication. The header system (1108) includes an inlet connection configured to receive a flow of hot fluid from thermal loads (1102) and an outlet connection configured to direct cooled fluid to thermal loads (1102).
摘要:
A heat exchanger (HEX) (400;900) for cooling air in a gas turbine engine (110) is provided. The HEX (400; 900) comprises a central manifold (410) comprising an inlet portion (412; 912), a first outlet portion (414; 914), and a second outlet portion (416; 916). The HEX (400; 900) further comprises a plurality of tubes (430) coupled to the central manifold (410), the plurality of tubes (430) comprising at least a first tube, a second tube, a third tube, and a fourth tube, a shroud (450; 950) at least partially encasing said plurality of tubes (430), and a cooling air flow path (F) defined by at least one of the shroud (450; 950), the plurality of tubes (430), and an outer surface (666) of the central manifold (410), wherein the cooling air flow path (F) is orthogonal to said plurality of tubes (430).
摘要:
A propulsion system (14,16) including a gas turbine engine (20) and a nacelle (18) surrounding a portion of the gas turbine engine. The propulsion system further includes a heat exchanger (36), which is arranged within a strut (24) connecting the gas turbine engine and the nacelle, adapted to cool fluid from the gas turbine engine.
摘要:
A gas turbine engine (12) comprises a main compressor section having a high pressure compressor (141) with a downstream most end, and more upstream locations. A turbine section has a high pressure turbine (144). A first tap taps (126) air from at least one of the more upstream locations in the main compressor section, passing the tapped air through a first heat exchanger (122) and then to a cooling compressor (124). A second tap (140) taps air from a location closer to the downstream most end than the location of the first tap, and the first and second taps mix together and are delivered into the high pressure turbine (144). The cooling compressor (124) is positioned downstream of the first heat exchanger (122), and upstream of a location where air from the first and second taps mix together.
摘要:
A reverse flow gas turbine engine (10) includes a propulsor section (14) which includes a propulsor compressor section (44) and a propulsor turbine section (46). The propulsor section (14) includes a fan section (42) and a geared architecture (60). The fan section (42) is driven by the propulsor turbine section (46). A core section (12) is arranged fluidly between the propulsor compressor section (44) and the propulsor turbine section (46). The core section (12) includes a reverse flow duct (64) that reverses a core flow through the core section (12). At least one of the propulsor section (14) and the core section (12) has a two-spool arrangement.