IGNITION IN CONDITIONS WHERE A JET OF FUEL-AIR MIXTURE INTERACTS WITHTHE WALL OF A DIESEL COMBUSTION-CHAMBER

The dependence of the ignition delay and the limiting detonation tempe rature of fuel-air mixture on the geometric characteristics of the wal l 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 st artup, glancing initial incidence of the jet at the wall is preferable , with sharp rotation of the fuel-mixture flow to return it ro the fre e volume of the combustion chamber. This is explained by the additiona l heating of the mixture due to the sharp retardation and the continue d accumulation of heat in the vicinity of the stagnation point.