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Piston-Liner Crevice Geometry Effect on HCCI Combustion by Multi-Zone Analysis
Technical Paper
2002-01-2869
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A multi-zone model has been developed that accurately predicts HCCI combustion and emissions. The multi-zone methodology is based on the observation that turbulence does not play a direct role on HCCI combustion. Instead, chemical kinetics dominates the process, with hotter zones reacting first, and then colder zones reacting in rapid succession. Here, the multi-zone model has been applied to analyze the effect of piston crevice geometry on HCCI combustion and emissions. Three different pistons of varying crevice size were analyzed. Crevice sizes were 0.26, 1.3 and 2.1 mm, while a constant compression ratio was maintained (17:1).
The results show that the multi-zone model can predict pressure traces and heat release rates with good accuracy. Combustion efficiency is also predicted with good accuracy for all cases, with a maximum difference of 5% between experimental and numerical results. Carbon monoxide emissions are underpredicted, but the results are better than those obtained in previous publications. The improvement is attributed to the use of a 40-zone model, while previous publications used a 10-zone model. Hydrocarbon emissions are well predicted. For cylinders with wide crevices (1.3 and 2.1 mm), HC emissions do not decrease monotonically as the relative air/fuel ratio (λ) increases. Instead, maximum HC emissions are obtained for an intermediate value of λ. The model predicts this relative air/fuel ratio for maximum HC emissions with very good accuracy. The results show that the multi-zone model can successfully predict the effect of crevice geometry on HCCI combustion, and therefore it has applicability to the design of HCCI engines with optimum characteristics for high efficiency, low emissions and low peak cylinder pressure.
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Authors
- Salvador M. Aceves - Lawrence Livermore National Laboratory
- Daniel L. Flowers - Lawrence Livermore National Laboratory
- Francisco Espinosa-Loza - Lawrence Livermore National Laboratory
- Joel Martinez-Frias - Lawrence Livermore National Laboratory
- Robert W. Dibble - University of California, Berkeley
- Magnus Christensen - Lund Institute of Technology, Lund, Sweden
- Bengt Johansson - Lund Institute of Technology, Lund, Sweden
- Randy P. Hessel - University of Wisconsin-Madison
Citation
Aceves, S., Flowers, D., Espinosa-Loza, F., Martinez-Frias, J. et al., "Piston-Liner Crevice Geometry Effect on HCCI Combustion by Multi-Zone Analysis," SAE Technical Paper 2002-01-2869, 2002, https://doi.org/10.4271/2002-01-2869.Also In
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