Combustion chamber wall influences on the vaporisation, mixture formation and combustion in DI diesel engines with a small combustion chamber

Abstract

In direct injection passenger car diesel engines with a small displacement, the short distance between the injection nozzle and the wall of the combustion chamber can cause operating conditions which display an intense contact between the fuel and the combustion chamber wall. The interaction between the liquid phase and the wall significantly influences the mixture formation, the combustion and consequently the formation of exhaust gases. During a research project which was carried out in a cooperation between the Lehrstuhl fur Technische Thermodynamik (LTT) of the Universitat Erlangen-Nurnberg and the Lehrstuhl fur Verbrennungsmotoren of the Universitat Dresden (LVD), injection, vaporisation, combustion and emission behaviour were analysed using conventional, electronic and optical measurement techniques in basic investigations and under engine-realistic conditions. Part 1 of this report summarises the results gained using an optically accessible high-temperature high-pressure injection chamber at the LTT Erlangen.