The effects of injected fuel temperature on exergy balance under the various operating loads in a DI diesel engine

摘要

In the present paper, the effects of fuel preheating on exergy analysis under the various operating loads in a DI diesel engine have been investigated. The combustion process is simulated utilising a three dimensional computational fluid dynamic (CFD) code. The second-law terms have been computed by a developed FORTRAN code. The calculations are carried out for three operating loads (50%, 75% and full load) and for each of them, four injected fuel temperatures have been mentioned: T-fuel = 353, 383 K as low and T-fuel = 463, 493 K as high-temperature cases. The obtained results indicated that increasing the injected fuel temperature leads to increase in fuel spray atomisation, better air-fuel mixing and improves combustion characteristics. Also, increasing the injected fuel temperature causes to increase the indicated work and heat loss availabilities, and decreases the exhaust gas availability and combustion irreversibilities.