Design and Simulation of Two Stroke Engines

Design and Simulation of Two-Stroke Engines
see also specific valves; Computer modeling;
Port timing; Scavenging
Port timing
disc-valved engine, 18, 19, 20
piston ported engine, 18-19
reed valved engine, 18, 20
timing diagrams, typical, 18
timing events, symmetry/asymmetry of, 15-16
see also specific valves; Port design; Scavenging
Power output
brake power output
defined, 36
brake mean effective pressure, 36-38
and piston speed, 44-45
vs. piston speed/swept volume, 44-45
of chainsaws
typical values, 45
vs. rpm (chainsaw engine simulation), 380,
381
and engine type
engine type, influence of, 45-46
four-stroke engine (GPB model), 169
racing motor, 45
truck diesel, 45
two-stroke engine (GPB model), 169
indicated (defined), 34-35
silencer design for high power output (motorcycle
engines), 581
see also Performance measurement
Preignition
in cross scavenging, 10
see also Detonation
Pressure oscillations
in tuned exhaust systems (racing motorcycle engine),
399-400
Pressure wave propagation
related terms:
Coefficient of discharge (unsteady gas flow)
Gas flow (general)
Gases, properties of
GPB engine simulation model
Particle velocity, determination of
Pressure wave propagation, friction loss during
Pressure wave propagation, heat transfer during
Pressure wave reflection in pipes
610
Pressure wave superposition in pipes
Propagation/particle velocity (acoustic
waves)
Propagation/particle velocity (finite amplitude
waves in free air)
Propagation/particle velocity (finite amplitude
waves in pipes)
QUB SP single-pulse experimental apparatus
Shock waves, moving (in unsteady gas flow)
Pressure wave propagation, fnction loss during
friction factor (bends in pipes)
introduction, 83
pressure loss coefficient (Cb), 83-84
friction factor (straight pipes)
introduction, 81
Reynolds number (Re), 82
thermal conductivity (C^), 81
viscosity ((J,), 82
work and heat generated, 83
discussion of results, 83
in straight pipes
introduction, 77
compression vs. expansion waves, friction effect
on, 81
discussion of results, 81
energy flow diagram, 77-78
particle movement (dx), 81
pressure amplitude ratios, 80
shear stress (x) at wall, 78
single wave vs. train of waves (discussion),
81
superposition pressures, 79
superposition time interval, 80
Pressure wave propagation, heat transfer during
introduction, 84
heat transfer coefficient, convective (Q,), 85
Nusselt number, 84-85
pressure loss coefficient (Cb), 84
total heat transfer, 85
Pressure wave reflection (in pipes)
at branches in a pipe
introduction, 114
accuracy of theories (numerical examples),
122-124
Benson superposition pressure postulate,
114-115
complete solution (general discussion),
117-118