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A zero-dimensional model is introduced that combines recently presented empirical relationships for diesel jet penetration and flame lift-off length in order to produce a realistic heat release rate and predict the temperature and equilibrium species concentrations in five zones within the combustion chamber. The new model describes the compression, combustion and expansion portions of a diesel cycle. During fuel injection and combustion, the temperature, geometry, and composition of five zones are calculated: 1) vaporizing fuel and air, 2) vaporized reactants, 3) premixed products, 4) adiabatic flame sheath, and 5) surrounding charge gas. The apparent heat release rate predicted by the model is compared with data from a constant volume combustion vessel (CVCV) and two single-cylinder direct-injection diesel engines. The rate of charge air entrainment is determined from the correlation of a non-vaporizing, non-reacting jet with no wall impingement.