jancancook
Nombre de messages : 237 Age : 38 Localisation : Viet Nam Date d'inscription : 15/02/2011
| Sujet: Jet engine Mar 22 Fév - 16:33 | |
| A jet engine is a reaction engine that discharges a fast moving jet to generate thrust by jet propulsion and in accordance with Newton's laws of motion. This broad definition of jet engines includes turbojets, turbofans, rockets, ramjets, pulse jets. In general, most jet engines are internal combustion engines[1] but non-combusting forms also exist. In common parlance, the term jet engine loosely refers to an internal combustion airbreathing jet engine (a duct engine). These typically consist of an engine with a rotary (rotating) air compressor powered by a turbine ("Brayton cycle"), with the leftover power providing thrust via a propelling nozzle. These types of jet engines are primarily used by jet aircraft for long distance travel. Early jet aircraft used turbojet engines which were relatively inefficient for subsonic flight. Modern subsonic jet aircraft usually use high-bypass turbofan engines which give high speeds, as well as (over long distances) better fuel efficiency than many other forms of transport.[citation needed] buy fosamaxclothing gothic | |
|
XREDXR
Nombre de messages : 308 Age : 29 Localisation : Viet Nam Date d'inscription : 07/02/2011
| Sujet: Re: Jet engine Ven 25 Fév - 7:46 | |
| t for long distance travel. Early jet aircraft used turbojet engines which were relatively inefficient for subsonic flight. Modern subsonic jet aircraft usually use high-bypass turbofan engines which give high speeds, as well as (over long distances) better fuel efficiency than many other forms of transport.[citation needed] Fish Oil Side effectsoriginal gift | |
|