AME 436

Effect of heat input (Diesel)"
Animation: P-V diagrams, increasing heat input via increasing f (same
displacement volume, same compression ratio)
Pressure (atm)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
Compression Combustion Expansion
Blowdown Intake Exhaust
Intake start 1 2
3 4 5
6 7
P-V diagram
P-V diagram
(high (low heat input)
(medium heat
1.0
0.0
0.0E+00 1.0E-03 2.0E-03 3.0E-03 4.0E-03 5.0E-03 6.0E-03
Cylinder volume (m^3)
AME 436 - Lecture 8 - Spring 2013 - Ideal cycle analysis
33
Effect of heat input (Diesel)"
Animation: T-s diagrams, increasing heat input via increasing f (same
displacement volume, same compression ratio)
Heat input does affect efficiency (shrinking T L /T H in Carnot strips as f
increases)
800
Compression Combustion Expansion
Blowdown Intake Exhaust
Close T-s cycle 1 2
3 4 5
6 7
700
Temperature (K)
600
500
400
300
200
T-s diagram
(medium (high (low heat heat input)
100
0
-100 0 100 200 300 400 500 600 700
Entropy (J/kg-K)
AME 436 - Lecture 8 - Spring 2013 - Ideal cycle analysis
34
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