Design and Simulation of Two Stroke Engines

Design and Simulation of Two-Stroke Engines
70 •
60
50 •
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O" 30 •
X
CO
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20 •
10 H
x"
O
z
w
-O
0
QUB 500 RESEARCH ENGINE, 1600 rpm
ram-tuned liquid and air-blast injection
RTL SOF50
RTL SOF90
ABI SOA80
RTL SOF70
0 1 2
bmep, bar
Fig. 7.61 Light load hydrocarbon emissions.
QUB 500 RESEARCH ENGINE, 1600 rpm
3 -i ram-tuned liquid and air-blast injection
ABI SOA80
RTL SOF70
0 1
bmep, bar
Fig. 7.62 Light load NOx emissions.
RTL SOF90
at, or below, 10 g/kWh at this low load level, which is a very creditable result. The bsfc is at
300 g/kWh for some of the RTL settings; that too is an excellent result and would translate
into very low on-road fuel consumption figures for an automobile. The bsNOx values mostly
hover around 1.0 g/kWh, or less, which remains as remarkably low as always. In Fig. 7.63, the
bsCO minimizes at 20 g/kWh and at 1.5 bar. That it is as high as 20 g/kWh at 1.5 bar bmep on
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2