Design and Simulation of Two Stroke Engines

Design and Simulation of Two-Stroke Engines
2S IE
CYLINDER
©+
H
D+
STATION 1
9E
3691
PIPE
STATION 2
Fig. 2.26 QUB SP apparatus with a straight pipe attached.
5901
ratio, are determined under steady flow conditions with air. They are presented in Fig. 2.27
and are a classic picture of the variation of Cd with respect to such parameters. Their measurement
is necessary for the accurate correlation of experiment with theory, as would be the
case for any engine simulation to be accurate, as inspection of Eq. 2.16.4 will indicate. In this
context, the discussion in Appendix A2.3 requires careful study, for the traditional methods
employed for the reduction of the measured data for the coefficients of discharge, Cj, have
been determined to be inadequate for use in conjunction with a theoretical engine simulation.
It is acknowledged that the initial design and development work on the QUB SP rig was
carried out by R.K. McMullan and finalized by S.J. Kirkpatrick. All of the pressure diagrams
and discharge coefficient data presented in Figs. 2.27-2.53 were recorded by S.J. Kirkpatrick,
and those in Figs. 2.55-2.57 were measured by D.O. Mackey. These individuals carried out
this work as part of their research work for a Ph.D. at The Queen's University of Belfast.
0.95
I- g 0.85
LU ^ 0.8
£1 O
CO
0.75
UJ 5
O
0.7
O 0.65 0.6
0.50 0.67 1.00 1.50 2.00 2.50 3.00
0.75
0.5
0.25
Fig. 2.27 Coefficient of discharge for the QUB SP (single pulse) apparatus.
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