Exergy analysis of natural gas/DME combustion in homogeneous charge compression ignition engines (HCCI) using zero-dimensional model with detailed chemical kinetics mechanism


Jafarmadar S., Javani N.

INTERNATIONAL JOURNAL OF EXERGY, cilt.15, ss.363-381, 2014 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 15 Konu: 3
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1504/ijex.2014.065713
  • Dergi Adı: INTERNATIONAL JOURNAL OF EXERGY
  • Sayfa Sayıları: ss.363-381

Özet

In the present work, a single zone combustion model with detailed chemical kinetics is developed to study the effect of dimethyl ether (DME) concentration on the combustion of natural gas from second law point of view in a homogeneous charge compression ignition (HCCI) engine. The code can predict all exergy terms in the cylinder with crank angle during a closed cycle. The chemical kinetics mechanism includes 83 species and 360 reactions. Exergy analyses is employed for different DME concentration and initial charge temperature at constant natural gas (NG) concentration. The results show that when the excess air ratios of DME increases from 6.5 to 14.7 at a constant air ratio of NG = 7.1), exergy efficiency increases 30.2% and irreversibility decreases 15.4%. Also, an increase in initial temperature, decreases the irreversibility and increases the heat loss exergy.