An Analysis of Diesel Combustion Focusing on the Combustion Rate of the Diesel Spary

Abstract

This report shows the effects of experimental factors such as the swirl strength, fuel injection period, number of fuel injector nozzle holes and initial fuel injection pressure on the heat release pattern from experimental results by use of a single cylinder, four stroke cycle, medium speed diesel engine. It is clear that while the magnitude of heat release rates is strongly affected by the quantity of residual fuel in the combustion chamber, it is not a suitable factor for analysing the combustion phenomena of a fuel oil spray or the effect of factors involved in the combustion phenomena. Therefore the authors have proposed an effective combustion rate Ke as an analysis coefficient. Ke is not affected by the quantity of residual fuel. Ke includes only the factors required to express the fuel oil spray conditions. Then, the use of the Ke can relate the results of a model test to actual engine performances.