Volume of Ejected Unburned Mixture from Combustion Chamber with Various Ignition Positions

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 U_u volume of ejected unburned mixture

A cross sectional area of nozzle

W_i 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.