THERMAL SCIENCE

International Scientific Journal

Meng Zhang

,

Jinhua H. Wang

,

Zuohua H. Huang

,

Norimasa Iida

NUMERICAL STUDY OF EFFECTS OF THE INTERMEDIATES AND INITIAL CONDITIONS ON FLAME PROPAGATION IN A REAL HOMOGENEOUS CHARGE COMPRESSION IGNITION ENGINE

ABSTRACT
The premixed flame speed under a small four stock homogeneous charge compression ignition engine, fueled with dimethyl ether, was investigated. The effects of intermediate species, initial temperature, initial pressure, exhaust gas recirculation, and equivalence ratio were studied and compared to the baseline condition. Results show that, under all conditions, the flame speeds calculated without intermediates are higher than those which took the intermediates in consideration. Flame speeds increase with the increase of crank angle. The increase rate is divided into three regions and the increase rate is obviously high in the event of low temperature heat release. Initial temperature and pressure only affect the crank angle of flame speed, but have little influence on its value. Equivalence ratio and exhaust gas recirculation ratio do not only distinctly decrease the flame speed, but also advance the crank angle of flame speed.
KEYWORDS
HCCI engine, DME, flame propagation, intermediate species
PAPER SUBMITTED: 2012-12-25
PAPER REVISED: 2013-03-26
PAPER ACCEPTED: 2013-04-24
PUBLISHED ONLINE: 2013-06-01
DOI REFERENCE: https://doi.org/10.2298/TSCI121225062Z
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2014, VOLUME 18, ISSUE Issue 1, PAGES [79 - 87]
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Numerical study of effects of the intermediates and initial conditions on flame propagation in a real homogeneous charge compression ignition engine

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