Fundamental of jet engine

1. 15.1 PRINCIPLE
http://part66.blogspot.com/

2. ENERGY
• Energy : Capacity to do work (Joule)
• Potential Energy : Result from influence of
gravity on mass due to its
position
PE = mass x gravity x height
• Kinetic Energy : Result from motion of mass
KE = 1/2mv2

3. NEWTON LAW
• 1ST Law :
A body will continue its state of rest or uniform motion
unless external force changing it.
2nd Law :
Rate of change of momentom of a body is proportional to
the applied force.
3rd Law :
In every action there will be equal and opposite reaction

4. BRAYTON CYCLE
• Brayton cycle :
– The process of converting heat to do the work in
jet engine.
– Air is compress,heat and accelerate due to air
molecule expand to produce the reaction force

5. RELATION
• Application to Jet engine :
u = 0m/s
mair= 260kg/s v=500m/s
Acc = (V–U) ÷ t Work = F x D
Acc =(500 – 0) ÷ 1s Work = Energy
Acc = 500 m/s2 KE = ½(mv2)
KE = ½(260)(500)2
KE = 32.5MJ
F = ma
F =260 x 500 Power = Work/Time
Thrust = 130kN Pow = 32.5/1s
Pow = 32.5Mwatt

6. TURBO JET

7. TURBOFAN

8. TURBOSHAFT

9. TURBOPROP