Exergy analysis of natural gas/diesel combustion in homogenous charge compression ignition engines (HCCI) using multi-dimensional model
by Samad Jafarmadar
International Journal of Exergy (IJEX), Vol. 17, No. 4, 2015

Abstract: One of the major problems in application of HCCI combustion engines is lack of direct control for combustion timing. A suggested solution for combustion timing control is using a binary fuel blend in which two fuels with different auto-ignition characteristics are blended at various ratios. The aim of this research is to investigate the energy and exergy analysis of HCCI combustion when a blended fuel, which consists of diesel fuel and natural gas, is used. In order to accomplish this task, the extended coherent flame model-three zone model (ECFM-3Z) has been used, which performs combustion computations using a CFD model. For the exergy analysis, an in-house computational code is developed, which uses the results of the energy analysis and combustion modelling at various cases. With crank position at different gas fuel-air ratios, various rate and cumulative exergy components are identified and calculated separately. It is found that as gas fuel-air ratio increases from 0.3 to 0.8, the exergy efficiency decreases 46.2% to 37.9%. Furthermore, the value of irreversibility decreases from 24% to 21.4% of the mixture fuels chemical exergies.

Online publication date: Tue, 01-Sep-2015

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Exergy (IJEX):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com