Environmental Engineering Reference
In-Depth Information
65
y
= -0.373
x
+ 80.27
r
2
= 0.978
61
57
53
49
45
40
50
60
70
80
90
100
% of unsaturation
FIGure 25.7
Variation of CN with percentage of unsaturation.
180
y
= 2.544
x
- 69.26
r
2
= 0.915
160
140
120
100
80
60
40
40
50
60
70
80
90
100
% of unsaturation
FIGure 25.8
Variation of IV with percentage of unsaturation.
The gradient between different properties and percentage of unsaturation was based only upon
the slope of the fitted lines. It may not be true for all cases. Because a large sample size would be
taken for investigation, the gradient of the aforesaid parameters may vary.
25.4.2 c
omBuStion
p
aramEtErS
The influences of biodiesel properties on different combustion parameters are discussed. The
following parameters were considered for the investigation:
• Dynamic injection timing
• Ignition delay
• Peak heat release rate
• Peak cylinder pressure
The experimental values of all of the above parameters at full load for various biodiesel fuels are
listed in Table 25.7.
25.4.2.1 dynamic Injection timing
Dynamic injection timing is the crank angle point at which the fuel jet actually enters into the engine
combustion chamber. Dynamic injection timing is one of the most important parameters because it
can have a significant effect on the engine performance and emissions. The advancement of injection
