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Topic: Propfan


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  Propfan turbo-engine
In particular, the relatively large hub ratio of the propfan blades, thus the ratio of the inside diameter of the blade to the outside diameter of the blade, is disadvantageously large, since, for aerodynamic reasons, the working turbine must have a certain minimum diameter.
It is also a disadvantage in the above-noted propfan turbo-engine, that the approach flow conditions of the propfan blades, as a result of the gas turbine body, which is arranged upstream of the propfan blades, during normal flight, are disturbed at least in proximity of the hub of the propfan.
In the present case, i.e., in the case of the contra-rotating propfan with a shroud, the approach flow Mach number is set by the contour of the shroud and the design of the propfan rotors, i.e., it is independent of the flying speed.
www.nmbest.biz /scitechcatalog/shrink-wrapping/propfan_turbo-engine.html   (2337 words)

  
 Propfan turbine engine - Patent 4887424
A propfan turbine engine as claimed in claim 1, where said cooling means has an intake channel for cooling air of annular ring-shape arranged in front of the intake channel of the gas turbine relative to the direction of air flow.
A propfan turbine engine as claimed in claim 2 wherein said reduction gearing comprises a gear housing, said gas turbine comprises an intake housing, said gear housing and intake housing defining an annular space which is connected to said intake channel of said cooling means, said heat exchanger being disposed in said annular space.
A nose cap 17 and cowlings 18a, 18b and 18c are fastened to the rotors of the propfan stages 11 and 12.
www.freepatentsonline.com /4887424.html   (1883 words)

  
 Propfan aircraft propulsion engine - Patent 4488399
This invention relates to a propfan driven by a gas turbine, in which the gas turbine includes a gas generator and some form of power turbine to drive the propfan through a reduction gear box, and the propfan is mounted downstream of the gas turbine.
Also the rear mounted propfan engine does allow the engine to be located at the rear of the aircraft so that the sideways noise from the propfan does not impinge upon the aircraft fuselage or only that part of it which does not include a passenger cabin.
In the FIGS., a propfan propulsion engine 10 includes a gas generator 12, the details of which are not shown, but would typically comprise a compressor, a combustion apparatus receiving compressed air from the compressor and fuel, and a compressor driving turbine driven by the high velocity, high temperature gases from the combustion apparatus.
www.freepatentsonline.com /4488399.html   (1357 words)

  
 TCC 402 - Thesis Technical Report Outline   (Site not responding. Last check: 2007-09-17)
The single rotation propfan with a swirl recovery vane is a third propfan configuration that fills a middle ground between single and counter rotation types in regards to these characteristics.
Because propfans generate high levels of near field noise, the rear fuselage configuration is very beneficial since it locates the propfan noise field behind the passenger compartment.
Instead of compromising both the turbine and propfan efficiency, as the gearless design is forced to do, coupling the gas generator turbine and propeller through a gearbox with the appropriate reduction ratio allows them both to operate at their peak efficiencies.
members.aol.com /sciszek/propfan.htm   (10853 words)

  
 Propfan - Wikipedia, the free encyclopedia
In the 1980's Allison collaborated with Pratt and Whitney on demonstrating the 578-DX propfan.
Unlike the competing General Electric GE-36 UDF, the 578-DX was fairly conventional, having a reduction gearbox between the LP turbine and the propfan blades.
Two rear-mounted D-27's propfans propelled the Antonov An-180, which was scheduled for a 1995 Entry-into-Service.
en.wikipedia.org /wiki/Propfan   (862 words)

  
 Aerospaceweb.org | Ask Us - Propfan Engines
A propfan is similar to a turbofan, or turboprop, in that it is powered by a jet engine core.
Perhaps one of the most significant series of propfan studies was conducted during the late 1970s and early 1980s.
Several planes used to test propfan engines have been designed to carry the propfan on one side of the aircraft while retaining a conventional jet engine on the other.
www.aerospaceweb.org /question/propulsion/q0067.shtml   (686 words)

  
 DAYS OF AIR AND SPACE CALENDAR   (Site not responding. Last check: 2007-09-17)
NASA's propfan concept of the mid 1970s envisioned use of a large external fan‹in effect a reincarnation of the propeller‹to move great amounts of air and thereby effect a dramatic increase in the bypass ratio.
A further advantage of the propfan is that it is not encased by a large, heavy duct, as is the turbofan.
While NASA and its contractor team were pursuing propfan technology development in one direction‹the single rotation "tractor" or "puller" system‹General Electric Company (U.S.A.) used the early NASA technology as a departure point for independent development of a different kind of propfan known as the Unducted Fan or UDF*.
vesuvius.jsc.nasa.gov /er/seh/profan.html   (1485 words)

  
 Ducted-Prop/Propfan Technologies - Archived 3/2000
The term "propfan" was coined several years ago to describe the advancing nature of propeller aerodynamics and geometry and the apparent melding of turbofan and turboprop engine configurations.
Propfan has come to mean much of the same to the aerospace community: highly swept, supercritical blades, either single or counter-rotating, rotating at near-supersonic or supersonic speeds, providing the potential for enormous improvements in aircraft operating economics, and at the same time allowing turbofan/turbojet-type speeds.
Operation is much quieter than a propfan, due to the noise-dampening shrouding of the fan section, and because the engine’s exhaust velocity is about half that of current turbofans of comparable thrust.
www.forecastinternational.com /archive/gt/eb0170.htm   (4364 words)

  
 P-9 LRAACA [Long-Range Air ASW Capable Aircraft]
The propfan´s required high by-pass ratio of 30:1 came from dual 12- to 15-foot diameter propellers with a higher tip speed than propellers.
First flown in August 1986, the UDF is a pusher-type propfan with two counter-rotating rotors of eight blades each.
While NASA and its contractor team were pursuing propfan technology development in one direction‹the single rotation "tractor" or "puller" system, General Electric Company (U.S.A.) used the early NASA technology as a departure point for independent development of a different kind of propfan known as the Unducted Fan or UDF*.
www.globalsecurity.org /military/systems/aircraft/p-9.htm   (783 words)

  
 Re: Boeing jet to break distance record
It was from this theory that the Propfan was developed, the basic idea being that the bypass ratio would be much greater for an unshrouded fan than for one within the engine nacelle as on a conventional turbofan.
For a while both Boeing and McDonnell Douglas were prepared to offer propfans on their next offering of small to medium sized airliners, MDC was planning on the MD-90 and 95 using them while Boeing was devising a brand new airliner with tail mounted engines they dubbed the 7J7.
McDonnell Douglas scrapped their propfan program and the MD90 was equipped with the same turbofans which the prior MD80 had recieved.
www.subchat.com /otchat/read.asp?Id=74231   (505 words)

  
 The Forum of the 1.Jagdmoroner Abteilung
General Electric had a separate turbine behind the core one, which drove the (single stage) prop via a shaft, the jet efflux exhausting via lateral ports ahead of the prop.
Most of the layouts for aft-fan, propfan driven aircraft envisaged a rear-engined "DC-9" layout, so exploding props would have been well behind the passenger area.
A few years back, various engine companies came up with similar ideas for a "Propfan" engine that would have 90% the speed of a turbofan and 90% the fuel economy of a turboprop.
www.1jma.dk /post.asp?method=ReplyQuote&REPLY_ID=46881&TOPIC_ID=2510&FORUM_ID=4   (2339 words)

  
 Widebody Aircraft Parade Pictures: Airbus A340
There was a lot of commotion in the aviation world these days about the so-called 'propfan' in these days, a turbofan concept with very high bypass ratio and without a nacelle.
The SuperFan was a mix of the traditional turbofan and the propfan.
It had the wide blades of the propfan but still the nacelle of the turbofan.
widebodyaircraft.nl /a340.htm   (889 words)

  
 Aerospaceweb.org | Ask Us - Turboprops and Jet Engines
A similar class of engines that is just starting to be used on production aircraft is the propfan.
Although the propfan also utilizes a gas turbine core, the power generated by the core is used to turn a series of unducted fan blades rather than propellers.
The key point to remember is that both the turboprop and the propfan are classified as "jets" since a jet engine is at the heart of the system.
www.aerospaceweb.org /question/propulsion/q0135b.shtml   (550 words)

  
 [No title]
Perhaps looking forward to smaller propfan engines/systems, Ratier-Figeac signed an agreement in mid-1990 with United Technologies Hamilton Standard to produce a family of advanced, lightweight, allcomposite propeller systems for 1500-5000 shp engines initially for regional aircraft.
A variant of the D236T, designated D-227 and rated at between 17,63519,840 lbst (78.5-88.25 kN), is the candidate for a proposed propfan-powered variant of the developmental Tupolev Tu.334 commercial transport.
Worldwide Distribution Owing to the diverse nature of the worldwide propfan technology effort, the exact number of pure propfan engines built, and their location, is unknown.
www.forecastinternational.com /archive/gt/eb0170.doc   (4425 words)

  
 Model Propfan Engine Test Facility MSU-114
This rotating facility is installed onto large - scale airplanes of various types to simulate propfan engines during wind tunnel investigations of takeoff and landing.
MSU-114 is generally used in combination with wind tunnel T-101, which has a large test section (i.e., 24 x 14 m).
propfan with six-component integral dynamometer and telemetric data transfer system;
www.tsagi.ru /eng/areas/test_facilities/engine_testing/msu-114.htm   (104 words)

  
 Peak Oil News & Message Boards >> Forums >> Energy Technology >> Airlines are saved too: biokerosene
The AN-70 engine seems to be what I though of as a high speed turboprop (as it still has a reduction gearbox between the LP turboshaft and the propfan shaft), meaning the propfan term must refer more to the design tip speed of the propellor blades.
The propfan developements that I was thinking of were where the blades are attached to directly to the outside of a low pressure turbine.
However, compromising the rotational speeds of the turbine blades in the hot flow and the propfan blades in the cold flow is difficult and means the propfan must run at very high speeds.
www.peakoil.com /fortopic14979-0-asc-15.html   (956 words)

  
 ShowNews Online: FARNBOROUGH 2004
Flights have also been successfully completed with a normal maximum cargo load of 35 tons and an overload of 47 tons, while earlier this summer, the An-70 demonstrated its ability to carry a 20-ton payload over a 1,620 nmi range after a takeoff run of only 664 yds, from unpaved airstrips, if required.
Under the original MTAIC agreement, Russian air force An-70 requirements totaled 164 aircraft-to be locally completed by the Polyot manufacturers' association for the airframe and the Salyut/Stupino groups for the D-27/CB-27 propfan units.
Similar tasks are being undertaken in the Ukraine by the AVIANT Kiev State plant and Motor Sich joint-stock company, respectively, for 65 air force An-70s.
www.aviationnow.com /shownews/04farn/top11_2.htm   (462 words)

  
 ICAO Journal – 1987
Final phase – flight testing — of a multi-blade propfan, under development in a 3-year U.S. programme, is expected later this year.
The programme, called Propfan Test Assessment (PTA), is directed by the U.S. National Aeronautics and Space Administration.
Tethered at up to 3,000 metres above their ground- or sea-based mooring pads, aerostats located along the southeastern United States provide unmanned platforms for coastal and sea surveillance, particularly directed against illicit drug trafficking.
www.icao.int /icao/en/jr/1987/index.html   (677 words)

  
 7/84 AIRCRAFT INDUSTRY — Industrial Policy — Targeted Industry   (Site not responding. Last check: 2007-09-17)
MITI has decided that it will be starting on the development of propfan propellers which recently have been showing very strong promise for nearly revolutionizing the aircraft industry in the US.
These propfan propellers, although basically propeller engines fly as fast as today's jets.
Yet their fuel consumption is about one-half that of current jet technologies and even 20-30% more efficient that that expected to be in use around 1991.
www.japanlaw.info /lawletter/july84/crb.htm   (341 words)

  
 future
Ultra high bypass (UHB) propfan or unducted fan engines (UDF), have a very high bypass to primary air ratio (about 30:1) caused by large propellers with a higher tip speed than previous designs.
Encasing this propfan is called a ducted fan engine and should be able to achieve higher speeds from being more aerodynamic.
Using a solid oxide fuel cell and a fuel (such as natural gas) an extremely efficient way of producing electricity can be made.
people.bath.ac.uk /en3jma/future.htm   (328 words)

  
 Aerospace Design Exhibit
The advancement in turboprop propeller designs and materials lead researchers to develop highly swept, twisted blades mounted on the rear of the engine that provided improved fuel efficiency or convention propulsion engines.
This propfan test assembly was successfully tested in 1987 and 1988 on a Boeing 727, a Glufstream-II and a McDonnell Douglas MD-80.
This Advanced Turboprop was flight tested on a Gulfstream-II operated out of the Glenn Research Center in 1987.
www.hq.nasa.gov /office/aero/exhibits/aerospace/artificat_photo3_53.htm   (102 words)

  
 3D propfan 3ds max xsi c4d obj
propfan 3d models, textures, and more in a variety of formats including.max,.3ds
Turbo Squid’s royalty-free 3D marketplace allows users to purchase and sell 3D models and textures once and use them as often as desired.
Turbo Squid is the most innovative online source for all of your 3D modeling and animation needs.
propfan.turbosquid.com /3d-Models/3ds/max/xsi/c4d/obj   (336 words)

  
 Propfan   (Site not responding. Last check: 2007-09-17)
The propfan is the turbojet engine of the future.
The new propfan features a huge fan propeller which is driven by a turbine and allows bypass ratios of 15:1 or more to be achieved.
Fuel consumption, noise and emissions are significantly reduced.
www.mtu.de /en/globals/glossar/P/propfan/index.html   (114 words)

  
 Terminology   (Site not responding. Last check: 2007-09-17)
The three blade types are propfan, rotor, and stator.
Its root intersects with the hub, and its tip is not confined by any geometry.
Examples of axial flow turbomachines are propellers for aircrafts and propulsors of torpedo.
www.eng.uab.edu /me/Faculty/bsoni/Research/tiger/term.html   (296 words)

  
 Unsteady Blade Pressures on a Propfan: Predicted and Measured Compressibility Effects   (Site not responding. Last check: 2007-09-17)
The operation of the eight-bladed SR7L propfan at 4.75¡ angle of attack was considered.
Also the predicted appearance of a shock in the highly loaded portion of the blade revolution is not indicated by the measurements.
At all the three Mach numbers, the measured (installed propfan) pressure waveforms show a relative phase lag compared to the computed (propfan alone) waveforms due to installation effects.
gltrs.grc.nasa.gov /cgi-bin/GLTRS/browse.pl?1992/E-7631.html   (313 words)

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