Design and Simulation of Two Stroke Engines

Design and Simulation of Two-Stroke Engines
TIME, seconds
SUDDEN CONTRACTION
0.00 0.01 0.02 0.03 0.04 0.05
Fig. 2.39 Measured and calculated pressures at station I.
0.06
1.10
SUDDEN CONTRACTION
O
b
<
LU
DC
1.05
CO 1.00
CO
LU
DC
Q_
0.95
TIME, seconds
0.00 0.01 0.02 0.03 0.04 0.05 0.06
gi.i
LU
DC
Z)
1.2
CO •) n
n u
CO
Fig. 2.40 Measured and calculated pressures at station 2.
MEASURED
LU
MEASURED-
DC
Q-
0.9
TIME, seconds
0.00 0.01 0.02 0.03 0.04 0.05 0.06
Fig. 2.41 Measured and calculated pressures at station 3.
the original exhaust pulse of 1.06 atm, but the wave proceeding to the outlet has been contracted
from a 80-mm-diameter pipe into a 25-mm tail-pipe.
It can be observed that the GPB finite system modeling gives a very accurate representation
of the measured events for the reflection of compression pressure waves at sudden decreases
in pipe area.
180