
03-10
SECTION 03 - ENGINE PREPARATION
1. Exhaust
2. Burnt gases
3. Fresh charge
4. Transfer port
5. Intake
6. Fresh charge
COMBUSTION PROCESS
Normal Combustion
Since the beginning of this study we have spoken
of air/fuel mixture combustion rather than explo-
sion. This combustion is a slow then accelerated
burning of the mixture within the combustion
chamber. It is not an explosion. Ignition occurs
with the firing of the spark plug.
This initial process generates heat and pressure
which in turn, is transmitted by conduction to the
contiguous portion of the unburned mixture.
When this portion has reached the point of self-
ignition, it starts to burn releasing more pressure
and heat.
This burning action, called a flame front, travels at
a speed of approximately 30 m (100 ft) per second
until all mixture is burned, thus providing maxi-
mum piston thrust.
F01D6IA
2
1
3
4
5
6
F01D5GA
Spark occurs
as piston
approches Top
Dead Center
F01D5HA
Flame front
begins...
...Traverses
combustion
chamber
rapidly...
F01D5IA
Содержание Bombardier
Страница 1: ......