An approach to determine the minimum specific fuel consumption and engine economical operation curve model.

Highlights • It is presented a model for determining specific fuel consumption of diesel engine. • Polynomial for calculating the minimum specific fuel consumption points is formed. • Engine economic operation curve model is given. • The effects of engine operating at economical operation curve are analyzed. Abstract An approach to determine the diesel engine minimum specific fuel consumption for a given engine power, and economic operation curve model is presented. The approach is based on experimentally obtained data on the specific fuel consumption and engine power. The specific fuel consumption experimental data obtained by engine manufacturer are approximated by a third order polynomial fit which is a function of an engine effective pressure and number of revolutions. The minimum specific fuel consumption is defined by the contact points of the constant specific fuel consumption curves and the curves of constant engine power. Based on the coordinates of the points, analytically obtained for given power values, engine economic operation curve model is defined. Economic operation curve enables a significant simplification of operation regime regulation according to the criteria of the highest economy. The method is demonstrated using the experimental data of the IMR S44/V diesel engine. [ABSTRACT FROM AUTHOR]