A fully analytical treatment of heat release in diesel engines

Abstract The paper details a wholly analytical approach to heat release modelling. The approach is based on the diffusion combustion process which is specific to diesel engines operating under very high injection pressures. The combustion is subsequently controlled mainly by two items, the instantaneous fuel mass present in the cylinder charge and the local density of turbulent kinetic energy. Analytical solutions are developed for each. An extensive test series was undertaken, covering the limiting torque curve (LTC) between 1250 and 4000 r/min and utilizing a high-pressure common rail diesel engine to generate the necessary validation data. The validation exercise has shown the flexibility of this heat release modelling approach to be extremely accurate and suitable for further development.