turboprop engine

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Turboprop Engine


an aircraft gas-turbine engine in which primary thrust is developed by a propeller and additional thrust (up to 8–12 percent) is produced by a gas jet flowing from a jet nozzle. Turboprop engines are used in subsonic airplanes and in helicopters.

Figure 1. Schematic of a helicopter turboprop engine: (1) helicopter rotor, (2) reduction gear, (3) air intake, (4) axial-flow compressor, (5) combustion chamber, (6) turbines for driving the compressor and the helicopter rotor, (7) exhaust nozzle

Atmospheric air that enters the engine in flight is compressed in an air intake and further compressed in a turbocompressor. The air is then supplied to a combustion chamber into which a liquid chemical fuel, usually aviation kerosene, is injected. The gases formed during the combustion of the fuel expand in a turbine, which turns the compressor and the propeller; the final expansion of the gases occurs in the jet nozzle. A reduction gear is used to match the rotational speeds of the turbocompressor rotor and the propeller or, in a helicopter, to transmit torque to the helicopter rotor, whose axis is at an angle to the axis of the turbine. In helicopters the compressor and the helicopter rotor are usually driven by turbines that are not mechanically connected. (See alsoAIRCRAFT ENGINE.)


turboprop engine

turboprop engineclick for a larger image
A turbine engine that drives a propeller through a system of reduction gears. Most of the heat energy in the exhaust gases is converted into torque, rather than using its acceleration for propelling the aircraft forward. The propeller is then either driven by the shaft carrying the compressor or by a separate turbine, which takes the power from the generated gases.
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