DETAILED DISCUSSION

1. A
Presentation
On
Turbofan engine
In partial fulfillment of requirements for the degree of
BACHELOR OF TECHNOLOGY
In
MECHANICAL ENGINEERING
[2016-17]
Submitted To : - Submitted by:-
Mr. Deepak Bhaskar Shailesh kumar
HOD (M.E.) B.tech 4th year
1333240066
DEPARTMENT OF MECHANICAL ENGINEERING
MAHARAJAAGARSAIN INSTITUTE OF TECHNOLOGY
NH-24, PILKHUWA GHAZIABAD 245304

3. 1. INTRODUCTION TO TURBOFAN ENGINE
 The turbofan engine is a propulsive mechanism to combine the high
thrust of a turbojet with the high efficiency of a propeller. Basically, a
turbojet engine forms the core of the turbofan; the core contains the
fan, compressor, burner, turbine, and nozzle.
TURBOFAN ENGINE

4.  A jet engine is a reaction engine discharging a fast moving jet that
generates thrust by jet porpulsion in accordance with newton’s laws
of motion.

7. The fan is responsible for producing the majority of the thrust
generated by a turbofan engine and is easily visible when looking at
the front of the engine. The fan is directly connected to the low
pressure compressor (LPC) and the low pressure turbine (LPT) by way
of a shaft known as the low pressure shaft. The fan is shown in figure.

8. A turbofan engine, viewed from the front, with the fan visible.

9. The purpose of compression is to prepare the air for combustion by
adding energy in the form of pressure and heat. The compressor is
divided into two portions: the low pressure compressor, mentioned
above, and the high pressure compressor. Both compressors
function in a similar manner; however, they interact with different
parts of the turbofan engine.

11. Combustion occurs within the combustor, a stationary chamber
within the core of the engine. The combustor is directly downstream
of the HPC and directly upstream of the high pressure turbine. The
purpose of the combustor is to add even more energy to the air flow
by way of heat addition. Within the combustor, fuel is injected and
mixed with the air. This fuel-air mixture is then ignited, creating a
dramatic increase in temperature and energizing the flow, propelling
it rearward towards the high pressure turbine.

12. Fuel

13. Expansion occurs within the high pressure and low pressure
turbines. Similar in appearance to the compressors, the turbines
have rows of blades which spin (as seen in Figure ). The purpose
of the turbines is to extract energy from the flow which is then
used to spin the compressors and the fan. The spinning fan
draws more air through the core of the engine which continues
the entire process, and it pulls more bypass air around the
engine, generating continuous thrust.

15. The exhaust nozzle is located directly downstream of the LPT and it
is the last component that the air flow touches before exiting the
engine. An example of an exhaust nozzle can be seen in Figure .
The exhaust nozzle is at station 5 in Figure and it is stationary, like
the combustion chamber. The purpose of the exhaust nozzle is to
propel the core flow out of the engine, providing additional thrust.
This is accomplished by way of its geometry or shape. The nozzle
also helps regulate pressures within the engine to keep the other
components functioning properly and efficiently.

18. 2. Rolls-Royce (America)
3. Pratt & Whitney (America)
4. Hindustan Aeronautics Limited (India)
1. General Electric
(America)

19. (A joint venture of Pratt & Whitney and General Electric Aviation)
6. International Aero Engines (Germany)
7. Kawasaki Heavy Industries (Japan)