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Optimization of Piston Bowl Geometry for a Low Emission Heavy-Duty Diesel Engine
Technical Paper
2020-01-2056
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A computational fluid dynamics (CFD) guided design optimization was conducted for the piston bowl geometry for a heavy-duty diesel engine. The optimization goal was to minimize engine-out NOx emissions without sacrificing engine peak power and thermal efficiency. The CFD model was validated with experiments and the combustion system optimization was conducted under three selected operating conditions representing low speed, maximum torque, and rated power. A hundred piston bowl shapes were generated, of which 32 shapes with 3 spray angles for each shape were numerically analyzed and one optimized design of piston bowl geometry with spray angle was selected. On average, the optimized combustion system decreased nitrogen oxide (NOx) emissions by 17% and soot emissions by 41% without compromising maximum engine power and fuel economy. The NOx and soot emissions of the optimized system were lower than the baseline case under both low and high Exhaust Gas Recirculation (EGR) conditions, and less sensitive to injection timing, which is beneficial to engine calibration. To reveal the key design factors of piston bowl geometry affecting emissions, three piston bowls with the geometry similar to the optimized bowl were simulated under the low speed condition. The results show that decreasing the oxygen-rich areas surrounded by high temperature mixture would reduce NOx formation, while organizing combustion in the center of combustion chamber would boost the engine power and decrease soot emissions.
Authors
- Peng Wang - WFIERI FAW
- Xin He - Aramco Americas
- Yuanjiang Pei - Aramco Americas
- Zexian Guo - Tsinghua University
- Boyuan Wang - Tsinghua University
- Shiyu Liu - Tsinghua University
- Zhi Wang - Tsinghua University
- Shijin Shuai - Tsinghua University
- Xingyu Sun - Shangdong Chambroad Petrochemicals
- Chen-Teng Chang - FAWDE
Topic
Citation
Guo, Z., He, X., Pei, Y., Chang, C. et al., "Optimization of Piston Bowl Geometry for a Low Emission Heavy-Duty Diesel Engine," SAE Technical Paper 2020-01-2056, 2020, https://doi.org/10.4271/2020-01-2056.Data Sets - Support Documents
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