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http://dx.doi.org/10.3795/KSME-B.2013.37.10.879

A Study About the Effect of EGR Ratio on DME HCCI Combustion Process  

Lim, Ocktaeck (School of Mechanical Engineering, Univ. of Ulsan)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.37, no.10, 2013 , pp. 879-886 More about this Journal
Abstract
This study aims to provide helpful suggestions for understanding the effect of high EGR on DME HCCI combustion. This study determined which between oxygen partial pressure and oxygen concentration was the main factor affecting the LTHR heating ratio. Furthermore, EGR and the supercharging effect were investigated. To define the parameters for the EGR ratio and supercharging pressure, a numerical analysis of the chemical reaction was conducted under the following conditions: (1) variation of EGR ratio, oxygen concentration, and oxygen content; (2) variation of oxygen partial pressure while the oxygen concentration was almost constant; and (3) variation of oxygen concentration while oxygen partial pressure was constant with EGR and supercharging. The results show that an increase in EGR reduces the combustion duration. On the other hand, an increase in boost pressure increases the combustion duration. Finally, the EGR and boost pressure affect the amount of increase in LTHR.
Keywords
Internal Combustion Engine; Numerical Analysis; Ignition; HCCI; DME;
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