Śmigło???

[gosca]

Jak sądzicie, do czego to słuzy? Jak działa?
www.airliners.net/open.file/537804/L/

[Gość: Wojtek]

Pogoogluj sobie za haslem "unducted fan"

[will_truman]

Sluzy do latania i dziala przez obrot wokol osi.
Juz nawet nie potrafisz wyszperac wlasnych zdjec, tylko musisz szukac krasc
pomysly z (niewatpliwie lepszego) forum lotniczego?

members.lycos.co.uk/forumlotnicze/

[gosca]

Masz moje słowo, ze to jest mój pomysł, a zdjecie znalazłam na airliners.net.
TAM NAWET NIE ZAGLĄDAM!!!

[gosca]

will_truman napisał:

> Sluzy do latania i dziala przez obrot wokol osi.

Nie ma co. Bardzo stechnizowana odpowiedż. Fachowe wyjaśnienie mechanizmu....
Cóż chylę czoła wielkiemu znawcy z profesionalnego (hihihi) forum.

[Gość: PAX]

Specjalnie dla ciebie:

UNDUCTED FAN engine was a new aircraft propulsion system that promised fuel
savings of 30 percent. It was a NASA-pioneered system known variously as the
propfan, unducted fan, open rotor or ultra high bypass engine. In the U.S.
three different types of propfans were flight tested or readied for flight, and
two leading aircraft manufacturers based their next generation airliner designs
on propfan propulsion.

The propfan had its origin in NASA's Aircraft Energy Efficiency program, begun
in 1975 to combat rising fuel costs by reducing fuel consumption in a variety
of ways. Propfan work started as an investigation of combining the best
features of the turbofan engine and the aircraft propeller, which has
inherently better fuel consumption characteristics. Used in most modern
airliners, the turbofan is a type of jet engine in which some of the air taken
in is compressed, burned in a combustion chamber and expelled at high velocity
as thrust, but a far greater amount of air bypasses the combustion process;
pushed rearward by a large diameter, multibladed internal fan, this slower
moving unburned air mixes with the hot exhaust gas. The result is a very large
gain in overall thrust with minimal expenditure of fuel. Propulsion engineers
use the term "bypass ratio" to indicate how much air bypasses the combustion
chamber; for example, a bypass ratio of six to one means six times as much cold
(unburned) air as hot. Generally speaking, the higher the bypass ratio, the
greater the efficiency of the engine at subsonic airliner cruise speeds.

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. But to drive aircraft
at jetliner speeds, the propfan blades would have to have supersonic tip
velocity. Therefore, the new "fan" would little resemble its ancestor, the
propeller; it would have to be much thinner, yet stronger, and shaped
differently to allow faster rotation.

[kocipazur]

To jest silnik śmigłowy czy wentylatorowy? Jak to działa?