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 | Piston Engine |
| combustion occurs at a constant pressure | occurs at a constant volume |
induction, compression, combustion and exhaust occur continuously | induction, compression, combustion and exhaust occur intermittently |
| eliminates the three 'idle' strokes, thus enabling more fuel to be burnt in a shorter time | only one stroke is utilized in the production of power |
continuous action and is not enclosed so pressure is constant and volume increases | no continuous action and is enclosed so pressure rises and volume is constant |
| no peak or fluctuation pressures | peak pressures in excess of 1,000 lb. per sq. in. |
| requires light fabricated combustion chambers | requires cylinders of heavy construction |
| low octane fuels | 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-
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