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Development of Pre-chamber with Less Combustion Variation with Use of LES
Technical Paper
2019-01-2223
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Pre-chamber type gas engines have some merits; one is high efficiency thanks to lean combustion and the other is lower emissions such as CO2 compared to diesel engines. On the other hand, in pre-chamber type gas engines, one factor which frustrates higher efficiency is cycle-to-cycle variation of combustion. One reason why combustion variation occurs is assumed to be variation of fluid in pre-chamber. Such variation of fluid causes variation of equivalence ratio around the spark plug. It leads to unstable ignitability, and as a result, the peaks of in-cylinder pressure vary in different cycles. In order to overcome such technical problem, designing the pre-chamber shape with less cycle-to-cycle variation of combustion is needed. When designing the pre-chamber, CFD (Computational Fluid Dynamics) is a strong tool because detailed fluid history can be captured easily with CFD compared to experiments. LES (Large-Eddy Simulation) is assumed to have potential to realize cycle-to-cycle variation because it can calculate eddies whose size are larger than mesh size without modeling. Therefore, LES was applied to investigate the cause of cycle-to-cycle variation. In this study, some LES of pre-chamber type gas engines were conducted. From the simulated results, the factor of cycle-to-cycle variation has been revealed. After that, the new pre-chamber shape with less combustion variation has been designed. The effect of the new pre-chamber shape for less combustion variation was confirmed with use of both CFD and experiments.
Authors
- Tomohiro Koga - Mitsubishi Heavy Industries, Ltd.
- Shintaro Shuto - Mitsubishi Heavy Industries, Ltd.
- Daisuke Takemoto - Mitsubishi Heavy Industries, Ltd.
- Yuji Oda - Mitsubishi Heavy Industries, Ltd.
- Akihiro Yuki - Mitsubishi Heavy Industries, Ltd.
- Yuta Furukawa - Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.
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Citation
Koga, T., Shuto, S., Takemoto, D., Oda, Y. et al., "Development of Pre-chamber with Less Combustion Variation with Use of LES," SAE Technical Paper 2019-01-2223, 2019, https://doi.org/10.4271/2019-01-2223.Data Sets - Support Documents
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References
- Yuta , F. , Taro , T. , Daisuke , K. , Yosuke , K. , Akihiro , Y. , Daisuke , T. Technology for Improving Combustion Reliability of High Speed Engines Mitsubishi Heavy industries Technical Review 54 1 33 38 2017
- Amsden , A. A. , O'Rourke , P. J. , Butler , T.D. KIVA-II: A Computer Programs for Chemically Reactive Flows with Sprays LA-11560-MS 1989
- Torres , D. J. , Trujillo , M. F. KIVA-4: An unstructured ALE code for compressible gas flow with sprays Journal of Computational Physics 2006
- Liang , L. , Reitz , R. D. 2006