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Thermal Engineering by Sukumar Pati, Sadhu Singh

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Chapter 17

Jet Propulsion

17.1 ❐ PRINCIPLE OF JET PROPULSION

Jet propulsion is the thrust produced by passing a jet of fluid in the direction opposite to the motion of the object. The propulsive thrust in jet propulsion is obtained by the reaction of the engine produced by the exit of high velocity fluid stream from the nozzle. In case of a jet engine, the atmospheric air is drawn into the engine and compressed in a compressor driven by a gas turbine. The compressed air is used in the combustion chamber of the gas turbine and is partly expanded to extract enough work to drive the air compressor. The balance expansion takes place in the nozzle and the high velocity exhaust from the nozzle provides the thrust, which is used to propel the vehicles. ...

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