SIMULATION AND EXERGY ANALYSIS OF TRANSIENT DIESEL-ENGINE OPERATION

A computer analysis has been developed for studying the energy and exe rgy performance of an indirect-injection, naturally-aspirated diesel e ngine operating under transient load or speed conditions and covering the operating profile of both industrial and automotive engines. The m odel is validated at steady-state operation and incorporates many nove l features for simulating the transient response and analyzing all of the engine availability terms. The analysis reveals via multiple diagr ams how the exergy properties of the diesel-engine subsystems vary acc ording to the engine cycles for various speed and load changes. The di agrams also show the current-speed response. In addition, the effects of operating parameters such as the intensity of the applied change or heat loss to the walls are described from first- and second-law persp ectives. (C) 1997 Elsevier Science Ltd.