TURBOPROP ENGINE USED IN SMALL AIRCRAFT WITH WORKING AND CONSTRUCTION

WORKING OF TURBOPROP ENGINE

In last section we have studied about turbojet and turbofan engines which are used in high speed aircraft's, now we will look into another category of jet engine called as turboprop engine. As the name suggests turbo means turbine and prop means propeller. Such engines find usage  in small aircraft's, small chartered planes etc. They generate relatively less thrust as compared to turbojet engine and turbofan engine discussed earlier. Let's have a insight to working of such engine.

A shaft coupled with large propeller fan and gear reduction box with compressor, combustion chamber and turbine mounted on the same line. The end of engine is characterized by exhaust nozzle of which generates relatively less thrust. The reduction gear box function to covert low rpm to high thrust and vice-versa.

The propeller fan sucks large air into the engine combuster which is compressed on the way passing through the compressor.

The fuel is mixed with air at combustion section and burned producing heat and heavy exhaust. The exhaust is then passed through the turbine blades where is expands. As hot gases passes through turbine, blades rotate the shaft on which it is mounted. On the same shaft propeller is mounted. Hence propeller also rotates. So, we can say that some power of turbine is utilized to run compressor and rest used by propeller fan.

The exhaust is driven to the tail of engine where it is pushed out through nozzle arrangement. Though the speed of exhaust is less as compared to turbojet, ramjet and turbofan engine but still such engine can achieve speed of 600 - 750 kmph. The exhaust pushes the aircraft in forward direction. This is working application of Newton's 3rd law of motion.
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