Numerical Simulation of HCCI Engine With Multi-Stage Gasoline Direct Injection Using 3D-CFD With Detailed Chemistry

In this paper, the detailed chemical kinetics was implemented into the three-dimensional CFD code to study the combustion process in HCCI engines. An extended hydrocarbon oxidation reaction mechanism (89 species, 413 reactions) used for high octane fuel was constructed and then used to simulate the chemical process of the ignition, combustion and pollutant formation in HCCI conditions. The three-dimensional CFD / chemistry model (FIRE/CHEMKIN) was validated using the experimental data from a Rapid Compression Machine. The simulation results show good agreements with experiments. Finally, the improved multi-dimensional CFD code has been employed to simulate the intake, spray, combustion and pollution formation process of the gasoline direct injection HCCI engine with multi-stage injection strategy. The models account for intake flow structure, spray atomization, spray/wall interaction, droplet evaporation and gas phase chemistry in complex multi-dimensional geometries. The calculated results show the periphery of fuel-rich zone formed by the second injection ignited first, then the fuel-rich zone ignited and worked as an initiation to ignite the surrounding lean mixture zone formed by the first injection. The results provide a detailed insight into the processes governing combustion and pollutant formation in the HCCI engine.

[1]  S. Lam,et al.  The CSP method for simplifying kinetics , 1994 .

[2]  C. Montgomery,et al.  A computational problem solving environment for creating and testing reduced chemical kinetic mechanisms , 2002 .

[3]  R. Reitz,et al.  Modeling and Experiments of HCCI Engine Combustion Using Detailed Chemical Kinetics with Multidimensional CFD , 2001 .

[4]  Shijin Shuai,et al.  Numerical Simulation of Mixture Formation and Combustion of Gasoline Engines With Multi-Stage Direct Injection Compression Ignition (DICI) , 2003 .

[5]  C. Westbrook,et al.  A Comprehensive Modeling Study of iso-Octane Oxidation , 2002 .

[6]  S. Correa.  A Review of NOx Formation Under Gas-Turbine Combustion Conditions , 1993 .

[7]  Shuji Kimura,et al.  New Combustion Concept for Ultra-Clean and High-Efficiency Small DI Diesel Engines , 1999 .

[8]  Robert W. Dibble,et al.  A Decoupled Model of Detailed Fluid Mechanics Followed by Detailed Chemical Kinetics for Prediction of Iso-Octane HCCI Combustion , 2001 .

[9]  D. Foster,et al.  Compression-Ignited Homogeneous Charge Combustion , 1983 .

[10]  John B. Heywood,et al.  Two-stage ignition in HCCI combustion and HCCI control by fuels and additives , 2003 .

[11]  Günter Karl Fraidl,et al.  CSI - Controlled Auto Ignition - the Best Solution for the Fuel Consumption - Versus Emission Trade-Off? , 2003 .

[12]  G. A. Lavoie,et al.  Modeling of HCCI Combustion and Emissions Using Detailed Chemistry , 2001 .

[13]  L. Kirsch,et al.  The autoignition of hydrocarbon fuels at high temperatures and pressures—Fitting of a mathematical model , 1977 .

[14]  Rui Chen,et al.  A computational study into the effect of exhaust gas recycling on homogeneous charge compression ignition combustion in internal combustion engines fuelled with methane , 2002 .

[15]  Tomonori Urushihara,et al.  Expansion of HCCI Operating Region by the Combination of Direct Fuel Injection, Negative Valve Overlap and Internal Fuel Reformation , 2003 .

[16]  C. Westbrook,et al.  A Comprehensive Modeling Study of n-Heptane Oxidation , 1998 .

[17]  N. Peters,et al.  Modeling of HCCI Combustion Using Adaptive Chemical Kinetics , 2002 .