Bleed-air - Factbites

Bleed-air - Factbites
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Topic: Bleed-air

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	Bleed air - Wikipedia, the free encyclopedia
		Bleed air is valuable in an aircraft for two properties: its high temperature and its high pressure.
		Bleed air in gas turbine engines is compressed air taken from within the engine, after the compressor stage(s) and before the fuel is injected in the burners.
		When used for cabin pressurization, the air from the engine must first be cooled (as it exits the compressor stage at temperatures as high as 300 °C) by passing the bleed air through an air-to-air heat exchanger cooled by cold outside air.
	en.wikipedia.org /wiki/Bleed_air (647 words)

	Environmental Control System - Wikipedia, the free encyclopedia
		The bleed air has the same composition as the outside air, thus, when the airplane is on the ground, you are breathing the same air, and the same outdoor contaminants, as the ground crew on the runway.
		To maintain the desired bleed air temperature, the air is passed through a heat exchanger called a "precooler." Air from the jet engine fan is blown across the precooler, which is located in the engine strut.
		Air cannot flow backwards though the engine except during a compressor stall (essentially a jet engine backfire), thus the bleed air should be free of these contaminants from the airplane's own engines.
	en.wikipedia.org /wiki/Environmental_Control_System (1522 words)

	Compressor Section - Generic Information
		Air is often bled from the final or highest pressure stage because at this point pressure and air temperature are at a maximum.
		As air velocity decreases, the pressure due to velocity or ram that has just been gained in Passing through preceding rotor stage decreases somewhat; however, the total pressure is the sum of static pressure and pressure due to ram.
		These air outlets are constructed in the form of ducts and are known by a variety of names including "air outlet ducts", "outlet elbows," and "combustion chamber inlet ducts." These outlet ducts perform a very important part of the diffusion process.
	www.aircav.com /gencompr.html (2327 words)

	Businesses-Air Management Power Systems
		The bleed air is provided by the engine bleed air system and controlled by valves feeding tubes extending along the wing leading edge.
		Pneumatic Systems include ducts and components that deliver compressed air (bleed air) from a power source (main engine or auxiliary power unit) to connecting points for using systems.
		Air management system (AMS) is a generic term used in the aircraft industry for the systems and equipment associated with the ventilation, heating, cooling, humidity/contaminant control, and pressurization within the aircraft occupied compartments, cargo compartments, and electronic equipment bays.
	www.hamiltonsundstrand.com /hsc/details/0,,CLI1_DIV22_ETI3026,00.html (846 words)

	MedlinePlus Medical Encyclopedia: Nosebleed
		Recurrent nosebleeds may be a symptom of an underlying disorder such as high blood pressure, taking large doses of aspirin or blood-thinning medication, allergies, a bleeding disorder, or a tumor of the nose or sinuses.
		Lying down with a nose bleed is not recommended, and you should avoid sniffing or blowing your nose for several hours after a nosebleed.
		Air moving through the nose can dry and irritate the membranes lining the inside of the nose.
	www.nlm.nih.gov /medlineplus/ency/article/000020.htm (839 words)

	Air Safety Week: Flight Tests of Fuel Tank Safety System a Mixed Success
		The amount of engine bleed air sucked away from the engines is a critical factor in fuel efficiency (it is one reason why pilots may turn off one air conditioning pack in flight or put the air conditioning to low- flow).
		In this system, pressurized bleed air from the engines enters a heat exchanger, where it is cooled before entering canister-shaped air separation modules (ASM) containing the hollow fiber membranes.
		The engine bleed air also is very hot, and needs to be cooled via the heat exchanger in the inerting system before it enters the ASMs:
	findarticles.com /p/articles/mi_m0UBT/is_28_18/ai_n6268082 (1351 words)

	Nat' Academies Press, The Airliner Cabin Environment and the Health of Passengers and Crew (2002)
		Bleed air was used to power a turbocompressor, which compressed the ram air to the proper pressure.
		Although some APUs provide compressed air in much the same manner that the main propulsion engines provide bleed air, by extracting compressed air from the turbine-engine compressor, some APUs use a compressor, that is independent of the engine compressor, as described previously.
		Although it is possible that alternative systems are being developed or could be developed, the committee saw no evidence that bleed-air-based systems cannot be designed, maintained, and operated to provide adequate clean air to the aircraft cabin.
	www.nap.edu /books/0309082897/html/64.html (680 words)

	Technical Reference - Section C
		See the third paragraph of this section.) The purpose is to bleed air trapped in the impeller cavity which may cause air-lock problems at start-up due to the higher viscosity of EVANS NPG Coolant.
		Air, which enters the cooling system during the conversion, or whenever the system is opened, and any combustion gases which may enter the system due to a slight head gasket leak, must be vented from the system.
		A liquid seal, isolating air from the coolant jacket, is formed by the combination of the high loop in the vent line and the cold engine liquid level remaining above the vent line inlet to the tank (after filling).
	www.evanscooling.com /html/techrefc.htm (3644 words)

	ASSIGNMENT SHEET
		Bleed air used for cross bleed starts, masker air, and prairie air passes through the bleed air reducing valve.
		Prairie air flows at 400 SCFM from a branch of the bleed air system through the prairie air cooler.
		F. After air passes through the bleed air cooler it splits off into two branches, one for starting air and the other for prairie/masker air.
	www.fas.org /man/dod-101/navy/docs/swos/eng/64b7-205.html (1567 words)

	News Release - ASHRAE Study Finds Engine Bleed Air Quality to be Excellent
		In addition, researchers discovered that overall, bleed air quality was excellent and was found to generally exceed desired levels of air quality for supply air in other environments, such as offices.
		ATLANTA –- Concentrations of air contaminants measured in a study of commercial aircraft were found to be generally lower than those in residential or commercial buildings, according to researchers at the Jan. 27-31, 2001, Winter Meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).
		Air quality measurements were conducted for three different airframes on 10 study flights.
	xp20.ashrae.org /NEWS/bleed.htm (425 words)

	(WO 2005/010414) BLEED VALVE SYSTEM
		The bleed valve (10) is designed so that moveable parts of the valve, including contact seals and a sliding shaft (70), are protected by the valve structure from debris and contaminants carried in the engine's air stream.
		During engine operation, the bleed valve (10) is opened to relieve air pressure by providing pressurized fluid, such as compressor air, to a valve chamber (100).
		(57) A bleed valve (10) for use in a gas turbine engine is provided; the bleed valve (10) may be used to relieve air pressure from a compressor stage of the engine.
	wipo.int /cgi-pct/guest/getbykey5?KEY=05/10414.050203&ELEMENT_SET=DECL (233 words)

	Boeing 777: Bleed Air
		The Engine Bleed Air system is controlled by two air supply and cabin pressure controllers (ASCPCs) which open and close appropriate valves.
		Engine Bleed Air comes from the high stage or low stage engine compressor section.
		Low stage air is used during high power setting operation and high stage air is used during descent and other low power setting operations.
	www.meriweather.com /777/over/bleed.html (231 words)

	ThumperTalk.com - How do I bleed air from Forks?
		In all the Mags and on the Net it says to "periodically bleed the air from the forks".
		I bleed mine after doing some hot laps around the track, or if I have been out and the temperature has risen.
		If you bleed the forks with the bike on the ground, the forks will settle slightly.
	www.thumpertalk.com /forum/printthread.php?t=17979 (245 words)

	Advances in High-Temperature Composites
		The ducts connect the aircraft's engine bleed air to a heat exchanger, and the cover keeps volatile fluids from reaching the duct's hot surface'a situation that could prove catastrophic.
		The basic construction of a B-1B bleed air duct includes a metal duct structure surrounded by a layer of insulation.
		Air flowing through the ducts regularly reaches temperatures between 800° and 1200°F. The cover is essential to safe operation of the aircraft because it keeps volatile fluids from contacting the duct's hot surface.
	www.afrlhorizons.com /Briefs/Aug04/ML0324.html (771 words)

	Airborne Air & Fuel Products, Parker Aerospace
		Ram air or low stage bleed air can be induced with high stage bleed air by the use of an ejector thereby reducing ground vapor cycle air conditioning loads and use of high stage bleed air.
		Bleed and ram air can be scheduled as a function of outside air temperature with flow automatically altitude compensated.
		Small aircraft and helicopter bleed air heating systems are controlled by Airborne pilot operated pressure regulators.
	www.parker.com /airborne/products/prodturb.html (378 words)

	Volcanic Ash -- Effects on Transportation and Mitigation Strategies
		Verbal pilot reports provided to the air control center are critical for informing other pilots and dispatchers of ash-contaminated airspace.
		Air filter restriction gauges can be installed by qualified mechanics.
		Rags, or any other intended filtering material, should not be placed over the carburetor inlet inside the air cleaner element; serious damage to the engine and/or loss of vehicle control may result.
	volcanoes.usgs.gov /ash/trans/index.html (5782 words)

	How to Repressurise & Bleed Air from Central Heating System
		Holding a cloth to catch any water spillage, slowly and gradually loosen the bleed screw on the radiator (do NOT remove the bleed screw) until any air (evidenced by hissing) or water starts to dribble out.
		To keep your boiler working efficiently, it is essential that any air that has found its way into the system be removed or 'bled' from the radiators.
		If there is no air in the system water will appear immediately.
	www.abacusgas.com /air-in-system.htm (527 words)

	Corvette Forum - Proper method to bleed the pwr. strng. system.
		I need to know the prefered way to bleed air out of the power steering system.
		If you start the engine before trying to work the air out, the power steering fluid will be whipped to a froth as the air and oil travels through the vanes in the power steering pump and mixed.
		There are procedures to try and get the air out of the power steering system before you start the engine.
	forums.corvetteforum.com /showthread.php?t=591509 (524 words)

	The Ilyushin Il-28 "Beagle"
		The two compartments were heated and pressurized using engine bleed air, with the crew also provided with an oxygen system.
		Since air superiority depended on fighter aircraft and since jet fighters were generally superior to piston fighters, the first priority was the development of Soviet jet fighters.
		Since the EAF didn't have aircrews trained for their Beagles at the time, the bombers were sent to friendly countries to sit out the war, which was fortunate since the EAF was chewed up fairly badly in the conflict.
	www.vectorsite.net /avil28.html (6765 words)

	Translation of idle air bleed
		idle air bleed in Hungarian is üresjárati fúvóka
		No great intellectual thing was ever done by great effort.
	www.brainytranslation.com /translations/id/idleairbleed294851.html (18 words)

	Aerospace + Defense Product Overview
		Bleed air is used to keep critical parts of the aircraft such as the wing leading edges ice-free.
		Products for ECS, like Air Purification Systems, Anti-Microbial, Cabin Air Recirculation, Crew Compartment and HEPA filters, are dedicated to preserving operational costs while providing clean and comfortable cabin environments for crew and passengers.
		Donaldson engine air intake filters for piston-powered aircraft remove dust from the air before it reaches the engine.
	www.donaldson.com /en/aircraft/products (370 words)

	BLEED-AIR SYSTEM
		and regulate bleed air to a predetermined pressure.
		Bleed air is supplied by the last compressor
		upstream of the butterfly routes bleed air to the
	www.tpub.com /content/aviation/14020/css/14020_88.htm (286 words)

	Boeing 767: Bleed Air
		Indicate associated engine high stage and Bleed Air valves have automatically closed due to the engine Bleed Air temperature exceeding the maximum temperature limit.
		ON - Allow associated Bleed valve to open when air pressure is available and system logic does not prevent opening.
		Indicates position of the APU Bleed valve disagrees with the position of the switch or the position called for by system logic.
	www.meriweather.com /767/over/bleed.html (144 words)

	Pneumatics, Air Conditioning & Pressurization (PH 10
		In automatic mode the crossbleed valve opens automatically when using APU bleed air.
		Then hot air is added through the trim air valves to the other two zones as needed to meet temp requirements.
		This hot air is called trim air and is how the zone temp system controls temperatures in three zones with only two packs.
	www.chipsplace.com /helpful/Airbus/Pneumatics.htm (1236 words)

	(WO 99/02402) LIQUID COOLED HIGH PRESSURE SEPARATION FOR AIR CYCLE COOLING SYSTEM
		The liquid cycle subsystem is in heat exchange relationship with the air cycle subsystem, with the liquid cycle subsystem comprising the condenser, the reheater, a first liquid-to-air heat exchanger, and a second liquid-to-air heat exchanger.
		The air cycle subsystem includes a liquid-to-air condenser, a liquid-to-air reheater downstream of the condenser, and a turbine downstream of the reheater.
		(57) An environmental control system includes an air cycle subsystem and a liquid cycle subsystem.
	wipo.int /cgi-pct/guest/getbykey5?KEY=99/02402.990121&ELEMENT_SET=DECL (181 words)

	Bleed Air Test Facility
		The pneumatics testing laboratory is ready to test pneumatic bleed air systems or components at extreme pressures, temperatures, and flow.
	www.parker.com /ead/cm2.asp?cmid=3784 (113 words)

	Safely air-bleed hydraulic cylinders using the Safe-T-Bleed® system.
		The current, industry-wide method of bleeding air, after installing new components, during new machine startup, or after installing new transmission lines, is to simply leave connectors loose and allow air and oil to discharge to atmosphere until the liquid is clear of air bubbles.
		Safe-T-Bleed®'s unique closed-loop AirBleed™ system allows you to bleed air out of cylinders, pumps, etc., safely and effectively, without ever having to open the system to atmosphere.
		with Safe-T-Bleed®, trapped air is pushed out of the circuit.
	www.safe-t-bleed.com /airbleed.html (264 words)

	Federal Aviation Regulation Sec. 23.1111 - Turbine engine bleed air system.
		(b) The effect on airplane and engine performance of using maximum bleed air must be established.
		(a) No hazard may result if duct rupture or failure occurs anywhere between the engine port and the airplane unit served by the bleed air.
		For turbine engine bleed air systems, the following apply:
	www.risingup.com /fars/info/part23-1111-FAR.shtml (137 words)

	Eaton Aerospace - Bleed Air Ducting
		The heart of any bleed air system is the flexible joint.
		A precisely designed system must provide for installation tolerances and accommodate cyclic motions induced by aircraft flexure and thermal growth.
		Due to the many variables in design and function, all Aeroquip bellows and flexible joints are designed to specific customer requirements to insure that all functional criteria are satisfied.
	www.aerospace.eaton.com /products/fluid_conveyance/bleedair (86 words)

	FAM-3.doc
		Flow control unit: controls bleed air, Draws ambient air in with venturi to mix with bleed air.
		Outflow valve: Meters the outflow of cabin air in r esponse to vacuum control forces from controller, Contains a preadjusted relief valve so that cabin diff does not exceed 4.7 psi.
		Excessive pressure bump is controlled by the LH landing gear safety squat switch which: [1] removes power fro m the preset and safety valve solenoids [2] actuates time delay relay that allows left engine to commence pressurization 6 seconds prior to right engine.
	www.baseops.net /t44/FAM-3.doc (1968 words)

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