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-
To see more, you must subscribe for licence "Basic Gas Turbine Rating" or sesssion "Basic Turbine Knowledge"