This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Understanding the Effects of Recycled Burnt Gases on the Controlled Autoignition (CAI) Combustion in Four-Stroke Gasoline Engines
Technical Paper
2001-01-3607
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2002 World Congress & Exhibition
SAE International Fall Fuels & Lubricants Meeting & Exhibition
Language:
English
Abstract
Controlled Auto-Ignition (CAI) combustion, also known as HCCI or PCCI, has recently emerged as a viable alternative combustion process to the conventional spark ignition (SI) or compression ignition (CI) process for internal combustion (IC) engines, owing to its potential for high efficiency and extremely low emissions. One of the most effective and practical means of achieving CAI combustion in an engine is to retain or recycle the burnt gases. In order to understand better the effects of recycled burnt gases on CAI combustion, detailed analytical and experimental studies have been carried out. The analytical studies were performed using an engine simulation model with detailed chemical kinetics.
The five effects of the recycled burned gases studied include:
- (1.)Charge heating effect: higher intake charge temperature due to hot burned gases;
- (2.)Dilution effect: the reduction of oxygen due to the presence of the burned gases;
- (3.)Heat capacity effect: due to higher specific heat capacity of burned gases;
- (4.)Chemical effect: chemical reactions involving CO2 and H2O in the burned gases
- (5.)Stratification effect: recycled burned gases are stratified from the fuel/air mixture.
And the main conclusions are:
- (1.)The charge heating effect is mainly responsible for the advanced AI timing due to hot burned gases. It increases the heat release rate and shortens the combustion duration.
- (2.)The dilution effect does not affect AI timing, but it extends combustion duration. Its slows down the heat release rate only when large amount of burned gases is present.
- (3.)The heat capacity effect is mainly responsible for the reduction in the heat release rate, and it has a similar effect to extend the combustion duration as the dilution effect.
- (4.)The chemical effect does not affect AI timing and heat release rate. It reduces the combustion duration slightly at high concentrations of burned gases.
- (5.)The stratified burned gases facilitate the CAI combustion due to the presence of higher temperature region at the boundary between of the hot burned gases and combustible charge.
Recommended Content
Authors
Citation
Zhao, H., Peng, Z., Williams, J., and Ladommatos, N., "Understanding the Effects of Recycled Burnt Gases on the Controlled Autoignition (CAI) Combustion in Four-Stroke Gasoline Engines," SAE Technical Paper 2001-01-3607, 2001, https://doi.org/10.4271/2001-01-3607.Also In
Homogeneous Charge Compression Ignition (Hcci) Combustion 2002
Number: SP-1688; Published: 2002-03-04
Number: SP-1688; Published: 2002-03-04
References
- Onishi, S. , Jo, S. H. , Shoda, K. , Jo, D. P. Kato, S. , Active Thermo-Atmosphere Combustion (ATAC)-A New Combustion Process for Internal Combustion Engines SAE paper 790501 1979
- Noguchi, M. , Tanaka, Y. , Tanaka, T. Takeuchi, Y. , A Study on Gasoline Engine Combustion by Observation of Intermediate Reactive Products During Combustion SAE paper 790840 1979
- Ishibashi, Y. , Asai, M. Improving the Exhaust Emissions of Two-Stroke Engines by Applying the Activated Radical Combustion SAE 960742 1996
- Duret, P. Venturi, S. Automotive Calibration of the IAPAC Fluid Dynamically controlled Two-Stroke Combustion Process SAE Paper 960363 1996
- Najt, P. Foster, D. E. Compression-Ignited Homogeneous Charge Combustion SAE paper 830264 1983
- Thring, R. H. , Homogeneous-Charge Compression-Ignition (HCCI) Engine SAE Paper 892068 1989
- Aoyama, T. , Hattori, Y. , Mizuta, J. , Sato, Y. , An Experimental Study on Premixed-Charge Compression Ignition Gasoline Engine SAE Paper 960081 1996
- Christensen, M. , and Johansson, B. , Influence of Mixture Quality on Homogeneous Charge Compression Ignition SAE Paper 982454 1998
- Flowers, D. , Aceves, S. , Smith, R. , Torres, J. , Girard, J. , and Dibble, R. , HCCI in a CFR Engine: Experiments and Detailed Kinetic Modelling SAE Paper 2000-01-0328 2000
- Lavy, J. , Dabadie, J. , Angelberger, C. , Duret, P. , Juretzka, A. , Schaflein, J. , Ma, T. , Lendresse, Y. , Satre, A. , Schulz, C. , Kramer, C. , Zhao, H. , Damiano, L. , Innovative ultra-low NOx controlled auto-ignition combustion process for gasoline engines: the 4-SPACE project SAE Paper 2000-01-1837 2000
- Li, j. , Zhao, H. , Ma, T. , Ladommatos, N. , Research and Development of Controlled Auto-ignition (CAI) Combustion on a 4-stroke Multi-cylinder Engine SAE 2001 Fall Fuels & Lubricants Sept. 2001
- Ryan, T. W. , Callahan, T. J. Homogeneous Charge Compression Ignition of Diesel Fuel SAE paper 961160
- Gray, A. W. , Ryan, T. W. , Homogeneous Charge Compression Ignition (HCCI) of Diesel Fuel SAE Paper 971676
- Suzuki, H. , Koike, N. , Odaka, M. Combustion Control Method of Homogeneous Charge Diesel Engines SAE Paper 980509
- Christensen, M. , Einewall, P. , Hohansson, B. , Homogeneous Charge Compression Ignition (HCCI) Using Isooctane, Ethanol and Natural Gas - A comparison to spark ignition operation” SAE Paper 972874
- Seko, T. , Kuroda, E. , Methanol Lean Burn in an Autoignition Engine SAE Paper 980531
- Flowers, D. , Aceves, S. , Westbrook, C. , Smith, J. , Dibble, R. , Detailed chemical kinetics simulation of natural gas HCCI combustion: Gas Composition Effects and Investigation of Control Stratigies ASME Paper 1999
- Zhao, H. , and Ladommatos, N. , Engine Combustion Instrumentation and Diagnostics 0-7680-0665-1 SAE International 2001
- Peng, Z. , Zhao, H. , and Ladommatos, N. , Modeling of Controlled Autoignition (CAI) Combustion in a Four-Stroke Gasoline Engine Proceedings of Institution of Mechanical Engineers, Part D. 2000
- Curren, H. J. , Pitz, W. J. , Westbrook, C. K. , Callahan, C. V. Dryer, F. L. , Oxidation of Automotive Primary Reference Fuels at Elevated Pressure Combustion Institute Spring Meeting University of California Berkeley, CA 1998
- Lund, C. Chase, L. HCT - A general computer program for calculating time-dependent phenomena involving one-dimensional hydrodynamics, transport, and detailed chemical kinetics 1995 Lawrence Livermore National Laboratory Report UCRL-52504