Basic Gas Turbine Rating » Basic Turbine Knowledge » Turbine Engine Types
64.4 Turbine Engine Types
64.4.2 Compare the working cycle of a turbine engine and a piston engine.
Gas Turbine Engine
- combustion occurs at a constant pressure
- induction, compression, combustion and exhaust occur continuously
- continuous action and is not enclosed so pressure is constant and volume increases
- no peak or fluctuation pressures
- requires light fabricated combustion chambers
- low octane fuels
- occurs at a constant volume
- induction, compression, combustion and exhaust occur intermittently
- only one stroke is utilized in the production of power
- no continuous action and is enclosed so pressure rises and volume is constant
- peak pressures in excess of 1,000 lb. per sq. in.
- requires cylinders of heavy construction
- high octane fuels
64.4.4 Describe the comparative advantages of turbine engines versus piston engines for aircraft propulsion.
Gas turbine engines
- have the ability to develop more power for a given size.
- are lighter weight (better power to weight ratio).
- are more compact, meaning less drag.
- are more reliable, and
- can use cheaper fuel (kerosene).
64.4.6 Describe the basic constructional arrangements of the following engine types-
The Gas Turbine engine works on the principal of turning a relatively small mass of air into a relatively large acceleration.
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