Abstract
When the combustible mixture in a combustion chamber with various ignition positions was ignited, the unburned mixture between the flame and the nozzle entrance was ejected from the nozzle previous to flame ejection, except when the ignition position was at the nozzle entrance. The ejected unburned mixture volume was obtained by
$
where Uu volume of ejected unburned mixture
A cross sectional area of nozzle
Wi mean velocity of i interval
i one interval of divided pressure curve
n number of i
t flame arriving time from ignition position to nozzle entrance
Δt t/n
φ ′ nozzle flow coefficient
The following results were obtained from our investigation.
(1) The ejected unburned mixture volume increases with increasing nozzle diameter.
(2) As the ignition position moves to the far end of the nozzle, the ejected unburned mixture volume increases.
(3) The non-ignition nozzle diameter has no direct connection with the ejected unburned mixture.