|
|
|
Numerical study of EGR effects on reducing the
pressure rise rate of HCCI engine combustion |
| Gen CHEN1,Norimasa IIDA2,Zuohua HUANG3, |
| 1.State Key Laboratory
of Multiphase Flow in Power Engineering, Xi’an Jiaotong University,
Xi’an 710049, China; Graduate School of Science and Technology,
Keio University, Japan; 2.Graduate School of Science
and Technology, Keio University, Japan; 3.State Key Laboratory
of Multiphase Flow in Power Engineering, Xi’an Jiaotong University,
Xi’an 710049, China; |
|
|
|
|
Abstract The effects of the inert components of exhaust gas recirculation (EGR) gas on reducing the pressure rise rate of homogeneous charge compression ignition engine combustion were investigated numerically by utilizing the CHEMKIN II package and its SENKIN code, as well as Curran’s dimethyl ether reaction scheme. Calculations were conducted under constant volume combustion and engine combustion (one compression and one expansion only, respectively) conditions. Results show that with constant fuel amount and initial temperature and pressure, as EGR ratio increases, combustion timings are retarded and the duration of thermal ignition preparation extends non-linearly; peak values of pressure, pressure rising rate (PRR), and temperature decrease; and peak values of heat release rate in both low temperature heat release (LTHR) and high temperature heat release decrease. Moreover, maximum PRR decreases as CA50 is retarded. With constant fuel amount, mixtures with different EGR ratios can obtain the same CA50 by adjusting the initial temperature. Under the same CA50, as EGR ratio increases, the LTHR timing is advanced and the duration of thermal ignition preparation is extended. Maximum PRR is almost constant with the fixed CA50 despite the change in EGR ratio, indicating that the influence of EGR dilution on chemical reaction rate is offset by other factors. Further investigation on the mechanism of this phenomenon is needed.
|
| Keywords
HCCI engine
combustion
EGR
DME
CA50
PRR
|
|
Issue Date: 05 September 2010
|
|
|
Machrafi H, Cavadias S, Guibert P. An experimental and numericalinvestigation on the influence of external gas recirculation on theHCCI autoignition process in an engine: Thermal, diluting, and chemicaleffects. Combustion and Flame, 2008, 155(3): 476–489
doi: 10.1016/j.combustflame.2008.05.001
|
|
Chen R, Milovanovic N. A computational study into the effect of exhaust gas recycling on homogeneouscharge compression ignition combustion in internal combustion enginesfuelled with methane. International Journalof Thermal Sciences, 2002, 41(9): 805–813
doi: 10.1016/S1290-0729(02)01375-3
|
|
Sato S, Iida N. Analysis of DME homogeneous charge compression ignition combustion. SAE 2003-01-1825, 2003
|
|
Kuwahara K, Ando H. Role of Heat Accumulation by Reaction Loop Initiated by H2O2 Decomposition forThermal Ignition, SAE 2007-01-0908, 2007
|
|
Yamada H, Suzaki K, Tezaki A, Goto Y. Transition from cool flame to thermal flame in compressionignition process. Combustion and Flame, 2008, 154(1,2): 248–258
|
|
Yamada H, Goto Y, Tezaki A. Analysis of reaction mechanisms controllingcool and thermal flame with DME fueled HCCI engines. SAE2006-01-3299, 2006
|
|
Curran H J, Pitz W J, Westbrook C K, Dagaut P, Boettner J-C, Cathonnet M. A wide range modeling studyof dimethyl ether oxidation. International Journal of Chemical Kinetics, 2000, 30(3): 229–241
doi: 10.1002/(SICI)1097-4601(1998)30:3<229::AID-KIN9>3.0.CO;2-U
|
|
Kee R J, Rupley F M, Meeks E, Miller J A. A Fortran chemical kinetics package for the analysisof gas-phase chemical and plasma kinetics. Sandia National Laboratories Report. 1996
|
|
Lutz A E, Kee R J, Miller J A. Senkin: A Fortran program for predictinghomogeneous gas phase chemical kinetics with sensitivity analysis. Sandia National Laboratories Report No. SAND87-8248. 1988
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
