Jet engine during take-off showing visible hot exhaust (Germanwings Airbus A319)
A jet engine is a type of reaction engine, discharging a fast-moving jet of heated gas (usually air) that generates thrust by jet propulsion. While this broad definition may include rocket, water jet, and hybrid propulsion, the term jet engine typically refers to an internal combustion air-breathing jet engine such as a turbojet, turbofan, ramjet, pulse jet, or scramjet. In general, jet engines are internal combustion engines.
Air-breathing jet engines typically feature a rotating air compressor powered by a turbine, with the leftover power providing thrust through the propelling nozzle—this process is known as the Brayton thermodynamic cycle. Jet aircraft use such engines for long-distance travel. Early jet aircraft used turbojet engines that were relatively inefficient for subsonic flight. Most modern subsonic jet aircraft use more complex high-bypass turbofan engines. They give higher speed and greater fuel efficiency than piston and propeller aeroengines over long distances. A few air-breathing engines made for high-speed applications (ramjets and scramjets) use the ram effect of the vehicle's speed instead of a mechanical compressor.
The thrust of a typical jetliner engine went from 5,000 lbf (22 kN) (de Havilland Ghost turbojet) in the 1950s to 115,000 lbf (510 kN) (General Electric GE90 turbofan) in the 1990s, and their reliability went from 40 in-flight shutdowns per 100,000 engine flight hours to less than 1 per 100,000 in the late 1990s. This, combined with greatly decreased fuel consumption, permitted routine transatlantic flight by twin-engined airliners by the turn of the century, where previously a similar journey would have required multiple fuel stops.[1]
^"Flight Operations Briefing Notes – Supplementary Techniques : Handling Engine Malfunctions" (PDF). Airbus. Archived from the original (PDF) on 2016-10-22.
A jetengine is a type of reaction engine, discharging a fast-moving jet of heated gas (usually air) that generates thrust by jet propulsion. While this...
A jet aircraft (or simply jet) is an aircraft (nearly always a fixed-wing aircraft) propelled by one or more jetengines. Whereas the engines in propeller-powered...
Jetengines can be dated back to the invention of the aeolipile around 150 BC. This device used steam power directed through two nozzles so as to cause...
This article briefly describes the components and systems found in jetengines. Major components of a turbojet including references to turbofans, turboprops...
direction to the jet. Reaction engines operating on the principle of jet propulsion include the jetengine used for aircraft propulsion, the pump-jet used for...
A jetengine performs by converting fuel into thrust. How well it performs is an indication of what proportion of its fuel goes to waste. It transfers...
Database Engine (also Office Access Connectivity Engine or ACE and formerly Microsoft Jet Database Engine, Microsoft JETEngine or simply Jet) is a database...
A pulsejet engine (or pulse jet) is a type of jetengine in which combustion occurs in pulses. A pulsejet engine can be made with few or no moving parts...
gas-turbine engines. It is colorless to straw-colored in appearance. The most commonly used fuels for commercial aviation are Jet A and Jet A-1, which...
trijet is a jet aircraft powered by three jetengines. In general, passenger airline trijets are considered to be second-generation jet airliners, due...
airbreathing jetengine that is widely used in aircraft propulsion. The word "turbofan" is a combination of the preceding generation engine technology of...
A jet pack, rocket belt, rocket pack or flight pack is a device worn as a backpack which uses jets to propel the wearer through the air. The concept has...
The turbojet is an airbreathing jetengine which is typically used in aircraft. It consists of a gas turbine with a propelling nozzle. The gas turbine...
A rocket engine uses stored rocket propellants as the reaction mass for forming a high-speed propulsive jet of fluid, usually high-temperature gas. Rocket...
twin-engine English Electric Lightning, which has two fuselage-mounted jetengines one above the other, engine No. 1 is below and to the front of engine No...
jetengine was shut down on climbing through 85,000 ft (26,000 m) and was started using the windmill method on descent through denser air. Pulse jet engines...
powered by turbine engines and are subject to engine failures for many similar reasons as jet-powered aircraft. In the case of an engine failure in a helicopter...
A ramjet is a form of airbreathing jetengine that requires forward motion of the engine to provide air for combustion. Ramjets work most efficiently...
is an airliner powered by jetengines (passenger jet aircraft). Airliners usually have two or four jetengines; three-engined designs were popular in the...
A precooled jetengine is a concept that enables jetengines with turbomachinery, as opposed to ramjets, to be used at high speeds. Precooling restores...
British English) is an additional combustion component used on some jetengines, mostly those on military supersonic aircraft. Its purpose is to increase...
Retrieved 14 March 2023. "Variations of JetEngines". smu.edu. Retrieved 31 August 2016. ""The turbofan engine Archived 18 April 2015 at the Wayback Machine"...
428 Super Cobra Jetengine was never offered with factory air conditioning due to the location of its engine oil cooler. Super Cobra-Jet — Bore 4.13 in...
turbojet engine. A patent was submitted by Maxime Guillaume in 1921 for a similar invention which was technically unfeasible at the time. Whittle's jet engines...
which turns a crankshaft. Unlike internal combustion engines, a reaction engine (such as a jetengine) produces thrust by expelling reaction mass, in accordance...
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