NASA Guide to Engines

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NASA Guide to Engines ( nasa-guide-engines )

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Turbine Engines In turbine engines, air is drawn in and compressed, fuel is added and burned, and the hot gases expand out the rear of the engine, pushing the aircraft forward. Some of these exhaust gases turn a turbine, which drives the compressor. A number of different types of gas turbine engines have been developed for use depending upon the specific needs of a particular type of aircraft. BASIC TURBINE ENGINES, OR TURBOJETS Turbojets were the first type of turbine engines developed. All the thrust of these engines comes through the turbine and nozzle, which is called the core of the engine. These are what people commonly refer to as jet engines. TURBOPROPS In a turboprop engine the turbine section takes most of the energy from the exhaust gas stream and uses it to turn a propeller as well as the compressor. These are often found on slower cargo aircraft and on helicopters. Lear jet. TURBOFANS These engines have a central engine core that uses about 10 percent of the intake air while a large turbine- powered fan pushes about 90 percent of the intake air around the outside of the core to produce the major- ity of the thrust. These are used on most commercial passenger aircraft because they make more thrust for every pound of fuel burned in the core. Cargo. AFTERBURNING TURBOJETS Afterburners are used only on supersonic fighter aircraft and only for short periods of time. Fuel is inject- ed into the hot exhaust stream to produce additional thrust, allowing for high speed at a cost of high fuel consumption. DC–9. Pushing the Envelope: A NASA Guide to Engines Fighter. 15 TYPES OF ENGINES

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