Theory on combustion similarity for different size diesel engines

The paper presents a theory on combustion similarity in diesel engines, and contributes to the realization of scale model-experiments. The theory is based on the correspondence of fundamental equations of change, i.e. continuity, motion, and energy equations, and the correspondence of initial and boundary conditions for the different size engines. As a result of the investigation, it was found that there exists a possibility of combustion similarity for different size diesel engines. The similarity conditions were identified on engine configuration, injection system, fuel properties, swirl ratio, engine revolution, droplet size of the fuel spray, temperature of the cylinder wall and ignition lag.