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a compressor does work on the gas , raising its pressure and temperature

a turbine does the reverse , it expands the gas as it passes through the turbine, extracting energy from the gas to do mechanical work.

For a typical jet engine , the flow track on a compressor is of a converging cross section while is it diverging for the turbine, which is as per gas dynamic laws.

The Turbine does two things here in the jet engine, one ,it runs the compressor and two, expands the gas to the propelling nozzle which produces thrust by accelerating the gas upto its exit.

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13y ago
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14y ago

Gas turbine is a rota dynamic IC engine while Piston engine is a reciprocating IC engine. Working fluid (air+gas mixture) flows continuously through rota dynamic engine but doesn't flow continuously through reciprocating engine. In case of piston engine a batch of working fluid enters in to the working chamber, goes under various processes & finally leaves out the working chamber. Next batch of fluid then enters into the working chamber & goes through the same procedure. But in a gas turbine working fluid enters continuously while going under various processes leaving the chamber simultaneously.

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14y ago

The difference is what is doing the work, in a gas turbine the turbine spinning does the work and in a piston engine the pistons going up and down moving the crank shaft does the work.

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Q: What is the difference between a Gas turbine engine and a piston engine?
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