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http://dx.doi.org/10.3795/KSME-B.2014.38.6.451

Numerical Investigation of Exhaust Gas Recirculation Effect under Boost Pressure Condition on Homogeneous Charge Compression Autoignition  

Oh, Chung Hwan (School of Mechanical Engineering, Univ. of Ulsan)
Jamsran, Narankhuu (School of Mechanical Engineering, Univ. of Ulsan)
Lim, Ock Tack (School of Mechanical Engineering, Univ. of Ulsan)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.38, no.6, 2014 , pp. 451-464 More about this Journal
Abstract
This study used numerical methods to investigates investigate the exhaust gas recirculation (EGR) effect under the condition of boost pressure condition on a homogeneous charge compression ignition (HCCI) combustion engine using numerical methods. The detailed chemical-kinetic mechanisms and thermodynamic parameters for n-heptane, iso-octane, and PRF50 from the Lawrence Livermore National Laboratory (LLNL) are were used for this study. The combustion phase affects the efficiency and power. To exclude these effects, this study decided to maintain a 50 burn point (CA50) at 5 CA after top dead center aTDC. The results showed that the EGR increased, but the low temperature heat release (LTHR), negative temperature coefficient (NTC), and high temperature heat release (HTHR) were weakened due by theto effect of the O2 reduction. The combined EGR and boost pressure enhanced the autoignition reactivity, Hhence, the LTHR, NTC, and HTHR were enhanced, and the heat-release rate was increased. also In addition, EGR decraeased the indicated mean effective pressure (IMEP), but the combined EGR and boost pressure increased the IMEP. As a results, combining the ed EGR and boost pressure was effective to at increase increasing the IMEP and maintaining the a low PRR.
Keywords
Homogeneous Charge Compression Ignition; Boost; Exhaust Gas Recirculation; Pressure Rise Rate; Autoignition;
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  • Reference
1 Lawerence Livermore National Laboratory, 2004, "Combustion Chemistry; Detailed Chemical Kinetic Reaction Mechanisms for the Combustion of PRF," https://www-pls.llnl.gov/?url=science_and_technology-chemistry-combustion-prf
2 Lawerence Livermore National Laboratory, 2012, "Combustion Chemistry; Detailed Chemical Kinetic Reaction Mechanisms for the Combustion of n-heptane," https://www-pls.llnl.gov/?url=science_and_technology-chemistry-combustion-n_heptane_version_3
3 Lawerence Livermore National Laboratory, 2009, "Combustion Chemistry; Detailed Chemical Kinetic Reaction Mechanisms for the Combustion of Iso-Octane," https://www-pls.llnl.gov/?url=science_and_technology-chemistry-combustion-iso_octane_version_3
4 Heywood, J. B., "Internal Combustion Engine Fundamental," MC Graw Hill, 1988
5 Kuwahara, K. and Ando, H., 2007, "Role of Heat Accumulation by Reaction Loop Initiated by H2O2 Decomposition for Thermal Ignition," SAE Technical paper series., 2007-01-0908
6 Kuwahara, K. and Ando, H., 2009, "Unuversal Rule of Hydrocarbon Oxidation," SAE International., 2009-01-0948
7 Dec, J. E., Yang, Y. and Dronniou, N., 2012, "Improving Efficiency and Using E10 for Higher Loads in Boosted HCCI Engines," SAE International., 2012-01-1107
8 Sjoberg, M. and Dec, J. E., 2008, "Influence of EGR Quality and Unmixedness on the High-Load Limits of HCCI Engines," SAE International, 2008-01-0666
9 Sjoberg, M. and Dec, J. E., 2007, "Thermodynamic and Chemical Effects of EGR and Its Constituents on HCCI Autoignition, SAE International, 2007-01-0207
10 Silke, E. J., Pitz, W. J., Westbrook, C. K., Sjoberg, M. and Dec, J. E., 2008, "Understanding the Chemical Effects of Increase Boost Pressure Under HCCI Conditions," SAE International, 2008-01-0019