24-07-2012, 01:44 PM
SEMINAR REPORT ON TURBOFAN ENGINES
AN TURBOFAN ENGINES.pptx (Size: 980.74 KB / Downloads: 176)
TURBOFAN ENGINE
The turbofan is a type of aircraft jet engine based around a gas turbine engine. Turbofans provide thrust using a combination of a ducted fan and a jet exhaust nozzle . Part of the airstream from the ducted fan passes through the core, providing oxygen to burn fuel to create power.
WORKING PRINCIPLE
The scientific principle on which the jet engine operates was first stated in scientific terms by Sir Isaac Newton in 1687. According to Newton's third law, for every action, there is an equal and opposite reaction.
FOR CYCLE TURBOFAN ENGINES
Thermodynamics of a jet engine are modeled approximately by a Brayton Cycle. The Brayton cycle is a thermodynamic cycle that describes the workings of the gas turbine engine, basis of the Turbofan engine and others.
ADVANTAGES
Advantages of turbofan over the other jet engines are
Fans are less noisy then blades.
High operation speeds (more than 3000km/h achieved) than turbojet at (550 km/s).
Low lubricating oil cost and consumption of fuel.
Rate of climb is higher.
DISADVANTAGES
The disadvantages of turbofan engine over other jet engines are:-
Uneconomical for short distance flight.
Due to low takeoff thrust, it requires longer runway.
High maintenance cost.
Less efficient than reciprocating engines at idle.
CONCLUSION
Turbine Engines which were much efficient than Rotary
Piston Engines.
Since fans are less noisy then blades.
High operation speeds (more than 3000km/h achieved) than turbojet at (550 km/s).
Low consumption of fuel.
Rate of climb is higher.
A high thrust can be produced compared to turbojet