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A 1-D Platform to Simulate the Effects of Dedicated EGR on SI Engine Combustion
Technical Paper
2017-01-0524
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The thermal efficiency of spark-ignition engines can be enhanced by increasing the rate of exhaust gas recirculation (EGR) such that the low temperature combustion regime could be achieved. However, there is an upper limit on the amount of EGR rate, beyond which flame speed becomes slow and unstable, and local quenching starts to hurt the combustion stability, efficiency, and emission. To resolve this issue, the concept of dedicated EGR has been proposed previously to be an effective way to enhance flame propagation under lean burn condition with even higher levels of EGR with reformate hydrogen and carbon monoxide. In this study, the effects of thermochemical fuel reforming on the reformate composition under rich conditions (1.0 < ϕ < 2.0) have been studied using detailed chemistry for iso-octane, as the representative component for gasoline. The rich combustion products are then used to represent the composition of the dedicated EGR, whose influence on laminar flame speed and ignition delay time is further analyzed and reported. It is seen that the D-EGR could accelerate flame propagation, while retarding auto-ignition delay in the NTC regime. Moreover, the performance of the dedicated EGR in an SI engine system has been simulated using a one-dimensional model in the commercial software GT-Suite under both full and part load conditions. Parametric studies have been performed to provide guidance on the optimal operation conditions for SI engine with dedicated EGR.
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Liang, L., Ge, H., Ge, H., and Zhao, P., "A 1-D Platform to Simulate the Effects of Dedicated EGR on SI Engine Combustion," SAE Technical Paper 2017-01-0524, 2017, https://doi.org/10.4271/2017-01-0524.Data Sets - Support Documents
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References
- Wei , H. , Zhu , T. , Shu , G. , Tan , L. et al. Gasoline engine exhaust gas recirculation - A review Applied Energy 99 2012 534 544
- Sjöberg , M. , Dec , J. , and Hwang , W. Thermodynamic and Chemical Effects of EGR and Its Constituents on HCCI Autoignition SAE Technical Paper 2007-01-0207 2007 10.4271/2007-01-0207
- Al-Qurashi , K. , Lueking , A. , and Boehman , A. The deconvolution of the thermal, dilution, and chemical effects of exhaust gas recirculation (EGR) on the reactivity of engine and flame soot Combust. Flame 158 9 1696 1704 2011 10.1016/j.combustflame.2011.02.006
- Alger , T. and Mangold , B. Dedicated EGR: A New Concept in High Efficiency Engines SAE Int. J. Engines 2 1 620 631 2009 10.4271/2009-01-0694
- Chadwell , C. , Alger , T. , Zuehl , J. , and Gukelberger , R. A Demonstration of Dedicated EGR on a 2.0 L GDI Engine SAE Int. J. Engines 7 1 2014 10.4271/2014-01-1190
- Zhu , L. , He , Z. , Xu , Z. , Lu , X. et al. In-cylinder thermochemical fuel reforming (TFR) in a spark-ignition natural gas engine Proc. Combust. Inst. 2016 10.1016/j.proci.2016.07.058
- Gukelberger , R. , Robertson , D. , Alger , T. , Almaraz , S. et al. Alternative Fuel Testing on a Port Fuel Injected LPL EGR and D-EGR® Engine SAE Technical Paper 2016-01-2170 2016 10.4271/2016-01-2170
- Powering the Way to Better Fuel Economy technology today Southwest Research Institute
- https://cearun.grc.nasa.gov/
- Yoo , C. , Luo , Z. , Lu , T. , Kim , H. et al. A DNS study of ignition characteristics of a lean iso-octane/air mixture under HCCI and SACI conditions Proc. Combust. Inst. 34 2985 2993 2013
- Davis , S. and Law , C. Laminar flame speeds and oxidation kinetics of iso -octane-air and n -heptane-air flames Proc. Combust. Inst. 27 1998 521 527
- Kelley , A. , Liu , W. , Xin , Y. , Smallbone , A. et al. Laminar flame speeds, non-premixed stagnation ignition, and reduced mechanisms in the oxidation of iso-octane Proc. Combust. Inst. 33 2011 501 508
- McLean , I. , Smith , D. , Taylor , S. The use of carbon monoxide/hydrogen burning velocities to examine the rate of the CO+OH reaction Proc. Combust. Inst. 1994 25 749 757
- Gamma Technologies 2016 GT-Suite
- Han , D. , Zhao , P. , and Huang , Z. Dilution, Thermal and Chemical Effects of Carbon Dioxide on n-heptane Two-Stage Auto-Ignition Process SAE Technical Paper 2016-01-0756 2016 10.4271/2016-01-0756
- Sun , H. , Yang , S. , Jomaas , G. , Law , C. High-pressure laminar flame speeds and kinetic modeling of carbon monoxide/hydrogen combustion Proc. Combust. Inst. 2007 31 439 446