This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Computational Investigation of the Stratification Effects on DI/HCCI Engine Combustion at Low Load Conditions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published November 2, 2009 by SAE International in United States
Annotation ability available
A numerical study has been conducted to investigate possible extension of the low load limit of the HCCI operating range by charge stratification using direct injection. A wide range of SOI timings at a low load HCCI engine operating condition were numerically examined to investigate the effect of DI. A multidimensional CFD code KIVA3v with a turbulent combustion model based on a modified flamelet approach was used for the numerical study. The CFD code was validated against experimental data by comparing pressure traces at different SOI’s. A parametric study on the effect of SOI on combustion has been carried out using the validated code. Two parameters, the combustion efficiency and CO emissions, were chosen to examine the effect of SOI on combustion, which showed good agreement between numerical results and experiments. Analysis of the in-cylinder flow field was carried out to identify the source of CO emissions at various SOI’s. The numerical results show that higher level of stratification is desirable to obtain higher combustion efficiency at the low load conditions. Detailed analysis of the in-cylinder charge distribution was carried out to quantify the stratification levels against the SOI timing.
CitationKeum, S., Im, H., and Assanis, D., "Computational Investigation of the Stratification Effects on DI/HCCI Engine Combustion at Low Load Conditions," SAE Technical Paper 2009-01-2703, 2009, https://doi.org/10.4271/2009-01-2703.
- Thring, R.H., Compression-Ignited Homogeneous Charge Combustion Engines. SAE Technical Paper Series No. 892068, 1989.
- Najt, P.M. and Foster, D.E., Compression-Ignited Homogeneous Charge Combustion. SAE Technical Paper Series No. 830264, 1983.
- Dec, J.E. and Sjöberg, M., A parametric study of HCCI combustion - the sources of emissions at low loads and the effects of GDI fuel injection. SAE Technical Paper Series No. 2003-01-0752, 2003.
- Brewster, S., Cathcart, G., and Zavier, C., The Potential of Enhanced HCCI/CAI Control Through the Application of Spray-Guided Direct Injection. SAE Technical Paper Series No.2008-01-0035, 2008.
- Hwang, W., Dec, J.E., and Sjöberg, M., Fuel Stratification for Low-Load HCCI Combustion: Performance and Fuel-PLIF Measurements SAE Technical Paper Series No. 2007-01-4130, 2007.
- Hessel, R.P., et al., Modelling Iso-Octane HCCI Using CFD With Multi-Zone Detailed Chemistry; Comparison to Detailed Speciation Data Over a Range of Lean Equivalence Ratios. SAE Technical Paper Series No. 2008-01-0047, 2008.
- Babajimopoulos, A., et al., A fully coupled computational fluid dynamics and multi-zone model with detailed chemical kinetics for the simulation of premixed charge compression ignition engines. International Journal of Engine Research, 2005. 6(5): p. 497–512.
- Peters, N., Turbulent Combustion. 2000: Cambridge University Press.
- Peters, N., Laminar diffusion flamelet models in non-premixed turbulent combustion. Progress in Energy and Combustion Science, 1984. 10: p. 319–339.
- Barths, H., et al., Simulation of Combustion in Direct Injection Diesel Engines Using a Eulerian Particle Flamelet Model. Symposium (International) on Combustion, 2000. 28(1): p. 1161–1167.
- Hasse, C. and Peters, N., A two mixture fraction flamelet model applied to split injections in a di Diesel engine. Proceedings of the Combustion Institute, 2005. 30 II: p. 2755–2762.
- Gauding, M., et al., Applying an Extended Flamelet Model for a Multiple Injection Operating Strategy in a Common-Rail DI Diesel Engine. SAE Technical Paper No. 2009-01-0720, 2009.
- Hergart, C.A., Modeling Combustion and Soot Emissions. 2001, RWTH Achen.
- Cook, D.J., et al., Flamelet-based modeling of auto-ignition with thermal inhomogeneities for application to HCCI engines. Proceedings of the Combustion Institute, 2007. 31 II: p. 2903–2911.
- Hergart, C.A., Barths, H., and Siewert, R.M., Modelling Approaches for Premixed Charge Compression Ignition Combustion. SAE Technical Paper Series No. 2005-01-0218, 2005.
- Keum, S., Im, H.G., and Assanis, D.N., An Improved Representative Interactive Flamelet Model Accounting for Evaporation Effect in Reaction Space. 2009, University of Michigan: Ann Arbor.
- Amsden, A., A Block-Structured KIVA Program For Engines With Vertical Or Canted Valves. LA-13313-MS, 1997.
- Amsden, A.A., O’Rourke, P.J., and Butler, T.D., KIVA-3: An Unstructured KIVA Program for Complex Geometries. Los Alamos National Laboratory document LA-UR-91-138, 1991.
- Kee, R.J., Rupley, F.M., and Miller, J.A., Chemkin-III : a Fortran Chemical Kinetics Package For The Analysis Of Gas-Phase Chemical And Plasma Kinetics. 1989.
- Kee, R.J., Rupley, F.M., and Miller, J.A., CHEMKIN-II: A Fortran Chemical Kinetics Package for the Anlysis of Gas-Phase Chemical Kinetics. SAND89-8009, 1989.
- Hindmarsh, A.C., LSODE and LSODI, two new initial value ordinary differential equation solvers. SIGNUM Newsletter, 1980. 15(4): p. 10–11.
- Jones, W.P. and McGuirk, J.J. Turbulent Shear Flows. 1980: Springer.
- Chen, J.-Y., Chen, Y.-H., and Choi, Y., Development and validation of isooctane skeletal mechanisms based on LLNL detailed mechanism. International Journal of Vehicle Design, 2008. 46(1): p. 128–38.
- Lavoie, G.A. and Heywood, J.B., Experimental and Theoretical Investigation of Nitric Oxide Formation in Internal Combustion Engines. Combustion Science and Technology, 1970. 1: p. 313–326.
- O’Rouke, P.J. and Amsden, A.A., The TAB Method for Numerical Calculation of Spray Droplet Breakup. SAE Technical Paper Series No. 872089, 1987.
- Sjöberg, M., et al., Comparing Enhanced Natural Thermal Stratification Against Retarded Combustion Phasing for Smoothing of HCCI Heat-Release Rates. SAE Technical Paper Series No. 2004-01-2994, 2004.
- Heywood, J.B., Internal Combustion Engine Fundamentals. 1988: McGraw-Hill.