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Topic: Turbofan

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	Turbofan
		The Turbofan spray head is a hydraulically driven air assisted atomiser which combines advanced Controlled Droplet Application technology with a powerful directed airblast for effective application in a wide variety of crops and cropping situations.
		Turbofan heads can be fitted to a variety of existing sprayer types, including axial fan airblast units and both tractor-mounted and self-propelled boom sprayers.
		The Turbofan head is available with a choice of easily interchangeable atomisers (either gauze mesh or stacked disc) in order to give optimal atomisation over a wide range of flow rates - between 0.25 and 8.0 litres per minute.
	www.micron.co.uk /product/turbofan (238 words)

	ch10-3
		The bypass ratio of a turbofan engine is defined as the ratio of the mass of air that passes through the fan, but not the gas generator, to that which does pass through the gas generator.
		For example, the efficiency of the turbofan with a bypass ratio of 1.4 increases from 8 percent to 27.5 percent as the Mach number is increased from 0.2 to 0.9.
		Comparison of the point with the curve for the high bypass ratio turbofan engine indicates that the efficiency of the fan engine is as high as that of the Wright engine at a Mach number twice that at which the Constellation cruised.
	www.hq.nasa.gov /office/pao/History/SP-468/ch10-3.htm (6601 words)

	Turbofan Thrust
		A turbofan engine is the most modern variation of the basic gas turbine engine.
		In the turbofan engine, the core engine is surrounded by a fan in the front and an additional turbine at the rear.
		That is why turbofans are found on high speed transports and propellers are used on low speed transports.
	www.grc.nasa.gov /WWW/K-12/airplane/turbfan.html (736 words)

	Mechanical Engineering "100 Years of Flight," Dec. 2003 -- "Jets Fans," Feature Article
		The remaining air continues into the compressor of the turbofan engine, where its pressure is increased to a high value near that of the turbojet.
		The velocity of the hot gas leaving the core nozzle of the turbofan is lower than the velocity of the hot air leaving the nozzle of the turbojet.
		Early arguments against the high bypass turbofan said that the external losses and drag of the nacelle were proportionately greater due to large flow of relatively low-velocity air from the fan.
	www.memagazine.org /supparch/flight03/jetsfans/jetsfans.html (1917 words)

	Aerospaceweb.org \| Ask Us - Jet Engine Types
		Turbofans are typically broken into one of two categories--low-bypass ratio and high-bypass ratio--as illustrated above.
		In a low-bypass turbofan, only a small amount of air passes through the fan ducts and the fan is of very small diameter.
		The fan in a high-bypass turbofan is much larger to force a large volume of air through the ducts.
	www.aerospaceweb.org /question/propulsion/q0033.shtml (1453 words)

	The Turbofan Engine
		A turbofan engine is basically a turbojet to which a fan has been added.
		Large fans can be placed at either the front or rear of the engine to create high bypass ratios for subsonic flight.
		For supersonic flight, a low bypass fan is utilized, and an augmentor is added for additional thrust.
	www.aviation-history.com /engines/turbofan.htm (98 words)

	Aircraft engine operation and malfunction
		A turbofan engine is simply a turbine engine where the first stage compressor rotor is larger in diameter than the rest of the engine.
		In a turbofan engine, thrust is developed by the fan rotor system, which includes the static structure (fan exit guide vanes) around it.
		To provide effective understanding of and preparation for the correct responses to engine in-flight malfunctions, this chapter will describe turbofan engine malfunctions and their consequences in a manner that is applicable to almost all modern turbofan-powered airplanes.
	fromtheflightdeck.com /Stories/turbofan (10402 words)

	Aeronautics - Aircraft Propulsion (TURBOFAN ENGINES)
		The turbofan engine has gained popularity for a variety of reasons.
		The result is that four times as much air is pulled into the turbofan engine as in the simple turbojet.
		The turbofan has greater thrust for takeoff, climbing, and cruising on the same amount of fuel than the conventional turbojet engine.
	www.allstar.fiu.edu /aerojava/flight65.htm (507 words)

	Aircraft engine operation and malfunction
		A turbofan engine is simply a turbine engine where the first stage compressor rotor is larger in diameter than the rest of the engine.
		In a turbofan engine, thrust is developed by the fan rotor system, which includes the static structure (fan exit guide vanes) around it.
		To provide effective understanding of and preparation for the correct responses to engine in-flight malfunctions, this chapter will describe turbofan engine malfunctions and their consequences in a manner that is applicable to almost all modern turbofan-powered airplanes.
	www.fromtheflightdeck.com /Stories/turbofan (10402 words)

	turbofan - Search Results - MSN Encarta
		The turbofan engine is an improvement on the basic turbojet.
		A modern derivative known as the turbofan, or fan-jet, adds a large fan in front of the compressor section.
		In some fan engines the bypass air is not remixed in the engine but exhausted directly.
	encarta.msn.com /encnet/refpages/searchdetail.aspx?q=turbofan&pg=1&grp=art (259 words)

	Fluent NEWS - Fall 2000 - Turbomachinery Supplement - Honeywell Validates Turbofan Mixer Nozzle Design
		Engineers at Honeywell Engines and Systems used CFD in an effort to minimize the number of test rig configurations necessary for the design of turbofan mixer nozzles from an average of three to one.
		These lobed mixer nozzles help to improve engine performance by maximizing gross thrust by 1-2 percent at cruise conditions, and minimizing peak exhaust velocity to reduce noise, particularly during take-off.
		Mixer nozzles work by introducing cooler fan air through an annular lobed structure to mix with the hot core flow from the turbofan engine exhaust.
	www.fluent.com /about/news/newsletters/00v9i2/s7.htm (290 words)

	Military jet engines (both turbofan, turbojet)
		This broad definition of jet engines includes turbojets, turbofans, rockets and ramjets and water jets, but in common usage, the term generally refers to a gas turbine used to produce a jet of high speed exhaust gases for special propulsive purposes.
		Most modern jet engines are actually turbofans, where the low pressure compressor acts as a fan, supplying supercharged air to not only the engine core, but to a bypass duct.
		With a turbofan there is abundant oxygen in the mixed flow in the jetpipe, much of which has not passed through the core and thus has had no fuel already burned in it.
	engines.fighter-planes.com /jet_engine.htm (5422 words)

	P&W touts geared turbofan version of Airbus A320
		In a normal turbofan engine, the fan section (those huge blades in the front,) the compressor section, and the gas turbine section all rotate at the same speed.
		The limit on the diameter of a turbofan is driven by the the outer edges of the fan approaching the speed of sound.
		and the geared turbofan is apparently an intermediate stage between the turbofan and the turboprop engine - the fan is larger than is suitable for operation at turbine speeds, but smaller than a turboprop and undoubtedly designed to turn faster than a turboprop propeller does.
	www.freerepublic.com /focus/f-news/1748918/posts (2139 words)

	turbofan (Site not responding. Last check: )
		he turbofan engines were developed for civil transport, which requires an efficient, quiet power unit operating at relatively low speeds.
		It was to become the cornerstone of the universal acceptance of the gas turbine by the airline industry.
		Turbofan engines are actually a cross between turbojet engine and a turboprop engine.
	www.bath.ac.uk /~en2ep/turbofan.htm (317 words)

	Aerospaceweb.org \| Ask Us - Pentagon & Boeing 757 Engine Investigation
		There are two basic types of turbofans that are differentiated by the relative amount of air that flows through the fan and around the engine core versus the amount of air that flows through the core itself.
		A turbofan with a low-bypass ratio means that most of the air flowing through the engine passes through the turbojet core and very little through the outer fan bypass duct.
		The RB211 is described as a triple-shaft or triple-spool turbofan since it uses three concentric shafts to drive the various rotating elements of the engine.
	www.aerospaceweb.org /question/conspiracy/q0265.shtml (4250 words)

	Turbofan Engine
		The only difference is that the turbofan has a large compressor fan to compress a lareger amount of air.
		Until the 1980s, the turbofan was essentially a engine for passenger planes and similarly large aircrafts, due to its better fuel efficiency.
		The engine is otherwise made to run like a conventional turbojet, where the exhaust forces the rear turbine blades to turn, which in turn moves the common shaft for the compressor fan blades and the ignition chamber.
	members.tripod.com /SuperSabre/avionic1.htm (119 words)

	ESS Goggles - Protective Goggles - Ballistic Goggles - Eye Protection
		The original ESS Striker TurboFan has been rebuilt to ensure that your vision stays clear during even the most rigorous activities and hostile environments.
		Powered by a single AA battery, the patented TurboFan system draws fresh airflow in through the lower edge of the goggle frame and forces humid air out the top at around 13,000 rpm.
		The Striker TurboFan goggle includes two 2.4mm polycarbonate high-impact lenses (Clear and Smoke Gray), an anti-reflective SpeedSleeve, and a protective soft case.
	www.essgoggles.com /Striker-TurboFan_7_detail.html (336 words)

	Turbofan Engine
		So a turbofan gets some of its thrust from the core and some of its thrust from the fan.
		The ratio of the air that goes around the engine to the air that goes through the core is called the bypass ratio.
		The mathematics describing the thrust of a turbofan engine is given on a separate slide.
	www.lerc.nasa.gov /WWW/K-12/airplane/aturbf.html (545 words)

	Rolls-Royce plc Model RB211 Turbofan Engines
		This revision to the existing AD is prompted by further data gathering by the FAA that demonstrates that the model RB211-535E4- 37 turbofan engine is not affected by machining-induced cracking within the currently published life of the HP turbine disc.
		The FAA is revising this amendment to remove the model RB211-535E4- 37 turbofan engine from the applicability.
		The FAA has received additional details of the engineering analysis based on field inspection data from the Civil Aviation Authority (CAA), which is the aviation authority for the U.K., and has determined that the model RB211-535E4-37 turbofan engine is not affected by machining-induced cracking within the currently published life of the HP turbine disc.
	www.airweb.faa.gov /Regulatory_and_Guidance_Library\rgAD.nsf/0/20842A0CA629370D86256D3B0054BDA3 (1521 words)

	Science Museum - History of Flight - Turbofan/prop (Site not responding. Last check: )
		The turbofan engine was developed for civil transport, which requires an efficient, quiet power unit operating at relatively low speeds.
		The turbofan overcomes these problems by using a core jet engine as a workhorse to drive a large mass of lower-speed air around it with a cowled fan.
		A turboprop is similar to the turbofan shown above but a propeller replaces the fan.
	www.sciencemuseum.org.uk /on-line/flight/flighten/fan.asp (134 words)

	ALF/LF 502/507 - Honeywell Aerospace
		Honeywell's ALF502/LF507 turbofans have been specifically designed for high-cycle, regional airlines requiring lower cost-of-ownership.
		These fuel-efficient, high-performance turbofan engines power some of the most successful 85-100 seat regional aircraft in the business.
		Building on that success, the LF507 turbofan has fast become a proven leader in the 7,000-lb.
	www.honeywell.com /sites/portal?smap=aerospace&page=Turbofan-Engines&theme=T6 (223 words)

	TFE731, CFE738 & ATF3 Turbofan Engines - Honeywell Aerospace
		First certified in 1972, more than 7,800 TFE731 turbofan engines have accumulated over 31 million service hours on more than 20 different aircraft applications.
		On the job, flying with the Falcon 2000 since early 1993,the all- new CFE738 6,000 lb.-class turbofan is designed for on-airframe maintenance and advanced digital borescope engine inspections for big productivity dividends.
		The ATF3 turbofan engine is a 3-spool design which offers exceptional specific fuel consumption (SFC) profile over a broad spectrum of thrust settings.
	www.honeywell.com /sites/portal?smap=aerospace&page=Turbofan-Products&theme=T6 (304 words)

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