A numerical study on pressure wave-induced end gas auto-ignition near top dead center of a downsized spark ignition engine

Auto-ignition of end gas is known as a main cause of knock in SI engine. In order to study the characters of auto-ignition induced by pressure wave, different levels of hot zones characterized by temperature gradients are created in end gas, which are then ignited by incident pressure wave developed...

Full description

Saved in:
Bibliographic Details
Published inInternational journal of hydrogen energy Vol. 39; no. 36; pp. 21265 - 21274
Main Authors Wei, Haiqiao, Shang, Yibao, Chen, Ceyuan, Gao, Dongzhi, Feng, Dengquan
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier 12.12.2014
Subjects
Alternative fuels. Production and utilization
Applied sciences
Computational fluid dynamics
Delay
Energy
Exact sciences and technology
Fluid flow
Fuels
Hydrogen
Ignition
Incidence
Mathematical models
Pressure waves
Turbulent flow
Numerical analysis
Sensitivity analysis
Pressure wave
Hydrogen
Autoignition
Spark ignition engine
Auto-ignition
Engine
Online AccessGet full text

Cover

More Information
Summary:Auto-ignition of end gas is known as a main cause of knock in SI engine. In order to study the characters of auto-ignition induced by pressure wave, different levels of hot zones characterized by temperature gradients are created in end gas, which are then ignited by incident pressure wave developed from main flame. Evolutions of pressure and temperature in end gas are monitored to investigate pressure incidence and end gas auto-ignition. Computational Fluid Dynamics (CFD) calculations are carried out in a simplified two-dimensional symmetrical computational domain. Turbulence is modeled by renormalization-group (RNG) k- epsilon model and the turbulence-chemistry interaction is modeled using Eddy Dissipation Concept (EDC) with a detailed chemical kinetic mechanism for hydrogen oxidation. Ignition delay sensitivity analysis is also employed to investigate chemical kinetics during the incidence of pressure wave. The results show that the incidence of pressure wave has significantly different effects on auto-ignition characteristics, thus resulting in different ignition delays, pressure oscillations and enhancements of reflected pressure wave.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2014.10.008