Ignition in conditions where a jet of fuel-air mixture interacts with the wall of a diesel combustion chamber

The dependence of the ignition delay and the limitting detonation temperature of fuel-air mixture on the geometric characteristics of the wall of a diesel combustion chamber at which a high-speed jet is incident is investigated experimentally on a motorless setup. It is shown that, to facilitate ignition in the characteristic conditions of diesel startup, glancing initial incidence of the jet at the wall is preferable, with sharp rotation of the fuel-mixture flow to return it to the free volume of the combustion chamber. This is explained by the additional heating of the mixture due to the sharp retardation and the continued accumulation of heat in the vicinity of the stagnation point.