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

Nemati A., BARZEGAR R., Khalilarya S.

International Journal of Exergy, vol.17, no.1, pp.35-53, 2015 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 17 Issue: 1
  • Publication Date: 2015
  • Doi Number: 10.1504/ijex.2015.069317
  • Journal Name: International Journal of Exergy
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.35-53
  • Keywords: CFD, Computational fluid dynamic, DI diesel engine, Engine load, Exergy analysis, Injected fuel temperature, Irreversibility
  • Hacettepe University Affiliated: Yes


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: Tfuel =353, 383 K as low and Tfuel = 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.