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Topic: Bleed air

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	Bleed air - Wikipedia, the free encyclopedia
		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.
		Bleed air is valuable in an aircraft for two properties: its high temperature and its high pressure.
		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 (719 words)

	Jet engine - Wikipedia, the free encyclopedia
		Air coming in the front of the engine is blown towards the rear of the engine by a fan stage (convergent ducts), where it is crushed against a set of non-rotating blades called stators (divergent ducts).
		Fuel is mixed with the compressed air and ignited by flame in the eddy of a flame holder.
		Air, bled from the compressor exit, passes around combustor and is injected into the rim of the rotating turbine disc.
	en.wikipedia.org /wiki/Jet_engine (7602 words)

	Engine air/fuel ratio control system injecting bleed air into both fuel systems of double barreled carburetor - Patent ...
		A primary air bleed tube 20 formed with a plurality of small primary air bleed holes 20' extends downwards into the primary well 19, and the upper end of this primary air bleed tube 20 is communicated, via a fixed metering primary air bleed jet 21, to the atmosphere.
		Similarly, a secondary air bleed tube 40 formed with a plurality of small secondary air bleed holes 40' extends downwards into the secondary well 39, and the upper end of this secondary air bleed tube 40 is communicated, via a fixed metering secondary air bleed jet 41, to the atmosphere.
		The end remote from the carburetor 3 of the primary air bleed conduit 29 is connected to one end of an air bleed conduit 50, already mentioned, and the end remote from the carburetor 3 of the air bleed conduit 49 is connected to one end of another air bleed conduit 52.
	www.freepatentsonline.com /4426976.html (3625 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.
		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.
		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.
	www.aircav.com /gencompr.html (2327 words)

	TSB Reports - Air 1996 - A96O0125
		During the start sequence, air pressure is available to all three engine start valves, and flow control valves are closed, so air pressure is not available for other aircraft systems.
		After all engines are operating, bleed air is made available to other aircraft systems by opening the flow control valves and closing the number 2 engine bleed air valves.
		When the aircraft is operating normally, the number 1 engine bleed air supplies air to the left air-conditioning pack and the number 3 engine bleed air supplies air to the right air-conditioning pack.
	www.bst.gc.ca /en/reports/air/1996/a96o0125/a96o0125.asp (1671 words)

	Diffuser - T-53-L-13
		The diffuser section is bolted to the compressor section and consists of an inner and outer housing separated by welded stationary vanes.
		Bleed air is hot compressed air which is bled from the engine diffuser section just prior to it entering the combustion chamber.
		It is used to anti-ice the air inlet section of the engine, heat the cabin, defrost the windshields and power the engine/transmission oil cooling fan.
	www.aircav.com /Huey/diffuser.html (210 words)

	Fuel saving gadgets - a professional engineer's view
		The ratio of air to fuel is a critical factor in petrol combustion.
		In this case the air bleed through the "fuel saving device" does nothing at all, since the manifold pressure sensor simply measures the air in the inlet manifold.
		The claim is that the air bleed device in some way alters the air and/or fuel flow, thus maintaining the correct mixture.
	www.fuelsaving.info /air_bleed.htm (2407 words)

	AWB AWB 26-1 Issue 1, 12 September 2003 Beech turboprop aircraft - Bleed Air Warning System
		The bleed air warning system is provided to give a visual warning to the crew of a leak in the bleed air ducting behind the firewall of either engine.
		The EVA tubes, one for the left bleed air supply ducting and one for the right, are routed forward to the pressure switches under the cabin floor.
		In this situation with the bleed air system now leaking, the crew and passengers would be put at additional risk through the loss of pressurisation.
	www.casa.gov.au /airworth/AWB/26/001.htm (793 words)

	MedlinePlus Medical Encyclopedia: Nosebleed (Site not responding. Last check: 2007-11-02)
		Air moving through the nose can dry and irritate the membranes lining the inside of the nose.
		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.
	www.nlm.nih.gov /medlineplus/ency/article/000020.htm (839 words)

	Airdisaster.Com Forums - Bleed Air, Engine question
		The extra air is bleed off for use by the engine starters, airconditioning system and other uses around the aircraft.
		The air from the compressor stages then enters the burner cans where it is mixed with jet fuel and burned....the "bang" part The resulting hot gasses then flow over the turbine stages causing the shaft to rotate.
		Once the engine is on line, you can tap air from the compressor section for various uses....this is known as the engine bleed system or pneumatics.
	www.airdisaster.com /forums/showthread.php?t=62205 (836 words)

	Airliner Cabin air quality, false claims about airliner cabin air quality
		Outside air is compressed by the turbine engines and a portion — bleed air — is diverted via the pneumatic system to air-cycle machines (packs), which cool the air.
		In one 1987–1994 investigation of the microbiological composition of cabin air on 45 flights, the researchers said, “Because the high compressor temperatures effectively kill any living organism in the intake air, the air supply is virtually sterile as it enters the cabin air-distribution system.
		In a recirculating system, a small portion of the exhaust air is discharged to the outside and is replaced with fresh outside air, which mixes with the portion of exhaust air that was not discharged to the outside.
	www.airlinesafety.com /articles/FSFCabinAir.htm (3816 words)

	News Release - ASHRAE Study Finds Engine Bleed Air Quality to be Excellent (Site not responding. Last check: 2007-11-02)
		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).
		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.
		Air quality measurements were conducted for three different airframes on 10 study flights.
	xp20.ashrae.org /NEWS/bleed.htm (425 words)

	Flying Bedstead
		The TMR was fitted with two MK4 Nene jet engines, which were standard Sea Hawk engines modified only by an air bleed system that allowed 10% of the engine compressor air to bleed off for the control systems of the rig.
		The TMR was controlled by bleeding air from the engine through the control valves to diametrically opposed pipes, each equipped with a nozzle that could swivel 30° in either direction for turning the rig left or right.
		The control valves were also interconnected to the control column so that movement of the column would restrict the flow of air to the nozzles, thereby reducing the thrust and so controlling which direction the rig would go.
	www.daviddarling.info /encyclopedia/F/flying_bedstead.html (751 words)

	Prairie / Masker
		Masker air disguises low frequency machinery noise that radiates through the hull and cools bleed air for use in engine starting and motoring.
		Prairie Air is drawn from the bleed air header, sent through a cooler then through the propulsion shafting to the propeller hubs where it is emitted from small holes on the propeller blades.
		Bleed air used for cross bleed starts, masker air, and prairie air passes through the bleed air reducing valve, reduceing bleed air pressure from 250 to 75 psig.
	www.globalsecurity.org /military/systems/ship/systems/prairie.htm (858 words)

	ABS Brake Bleed Procedure
		Attach one end of the bleed hose to the bleed screw and insert the opposite end of the hose in glass container partially filled with brake fluid (Fig.
		Be sure the end of the bleed hose remains immersed in fluid.
		This is necessary to prevent air from being drawn bank into the cylinder or caliper and brake line.
	dodgeram.org /tech/repair/Brakes/beeding.htm (1085 words)

	Bleed Air Heater Therodynamics - PPRuNe Forums
		Usually, a small volume of very hot bleed air is used to mix with a larger volume of ambient temp air being passed through a plenum chamber.
		It is the extra work done to the air by the compressor that raises the air's temperature by a greater amount than would result from the compression.
		The source air from the compressor should have a fairly stable temperature once the engine is running, but it takes some time for the warm compressed air to heat up the pipes delivering it to the cockpit.
	www.pprune.org /forums/showthread.php?p=2403190 (2373 words)

	Aerospace + Defense Bleed Air Filtration
		Bleed air systems take high temperature, high pressure air from the engine and supply it to the air-conditioning and anti-ice systems for aircraft.
		Bleed air is used to provide pressure for the aircraft cabin by supplying air to the Environmental Control System (ECS).
		Since modern jet turbines use multiple compressor stages, some newer engines for new aircraft designs have the bleed air inlet between compressor stages to reduce the temperature and reduction in the need for compressed air in more electric aircraft.
	www.donaldson.com /en/aircraft/products/bleed.html (185 words)

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

	Airdisaster.Com Forums - Bleed Air
		I am referring to both engines recieving bleed air from the APU on arrival and after engine shutdown, Bleed air coming out of the engines (never felt that before), not that it hurt my face too much coming out of the "outlet".
		Therefore, the eng bleeds are open at all times during flight, not just approach (but as I said earlier, the eng bleeds are left on at all times because there's no reason to turn them off).
		For air to excape from the nose cowl TAI exit (as Adrain said, that's not it) the PRSOV would have to be failed, the TAI switch left on (on the ground you have to override to get them open) or the TAI valve is failed open.
	www.airdisaster.com /forums/showthread.php?t=73415 (3392 words)

	Volcanic Ash -- Effects on Transportation and Mitigation Strategies
		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.
		Verbal pilot reports provided to the air control center are critical for informing other pilots and dispatchers of ash-contaminated airspace.
	volcanoes.usgs.gov /ash/trans (5782 words)

	Pneumatics, Air Conditioning & Pressurization (PH 10
		This hot air is called trim air and is how the zone temp system controls temperatures in three zones with only two packs.
		Then hot air is added through the trim air valves to the other two zones as needed to meet temp requirements.
		Conditioned air is added to attempt to cool and clear the smoke, then exhausted overboard.
	www.chipsplace.com /helpful/Airbus/Pneumatics.htm (1236 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)

	Boeing 767: Bleed Air
		Indicates position of the APU Bleed valve disagrees with the position of the switch or the position called for by system logic.
		Indicate associated engine high stage and Bleed Air valves have automatically closed due to the engine Bleed Air temperature exceeding the maximum temperature limit.
		Indicate associated Engine Bleed valve is closed, either from turning switch off or from logic.
	www.meriweather.com /767/over/bleed.html (144 words)

	A Simple Boost Bleed (Site not responding. Last check: 2007-11-02)
		If you were to run full boost pressure to the actuator, your boost would always stay low (about 6 psi max) because this pressure would blow open the wastegate and prevent higher boost levels.
		Your car's stock computer raises the boost above this minimum by "bleeding" some of the air pressure out of this feed line through the opening and closing of the wastegate solenoid; cycling the solenoid reduces the amount of boost pressure in the feed line which then reduces the opening of the wastegate.
		If you manually bleed more air out of the feed line than the computer does, your boost level will go higher than the computer lets it go.
	www.xmission.com /~dempsey/perform/bleed1.htm (570 words)

	Bleed Air Engines (Site not responding. Last check: 2007-11-02)
		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...
		50) this.border=1; this.alt='Thumbnails by Thumbshots.org';">EBU and Bleed Air Ducting
		Meggitt Safety Systems has developed a new bleed air leak detection (BALD) system for jet engines, and is to install the device on the General
	www.airbleed.info /info/Bleed-Air-Engines (795 words)

	Airborne Air & Fuel Products, Parker Aerospace (Site not responding. Last check: 2007-11-02)
		Small aircraft and helicopter bleed air heating systems are controlled by Airborne pilot operated pressure regulators.
		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.
	www.parker.com /airborne/products/prodturb.html (378 words)

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