Study on Knocking Intensity under In-Cylinder Flow Field in SI Engines Using a Rapid Compression Machine
Knocking intensity under the in-cylinder flow field was investigated by using a rapid compression machine (RCM). The nitrogen diluted and non-diluted fuel-air mixtures were employed for the examination of the combustion characteristics under the in-cylinder flow field. The behaviors of flame propaga...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2013-08-01
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| Series: | Journal of Thermal Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jtst/8/3/8_460/_pdf/-char/en |
| _version_ | 1818287062713892864 |
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| author | Taiga HIBI Takashi KOHATA Yosuke TSUMORI Shintaro NAMIKI Kazuya SHIMA Masato KATSUMATA Mitsuaki TANABE |
| author_facet | Taiga HIBI Takashi KOHATA Yosuke TSUMORI Shintaro NAMIKI Kazuya SHIMA Masato KATSUMATA Mitsuaki TANABE |
| author_sort | Taiga HIBI |
| collection | DOAJ |
| description | Knocking intensity under the in-cylinder flow field was investigated by using a rapid compression machine (RCM). The nitrogen diluted and non-diluted fuel-air mixtures were employed for the examination of the combustion characteristics under the in-cylinder flow field. The behaviors of flame propagation and the spontaneous ignition in end gas were observed. The analyses of the in-cylinder flow field and the dependency of the knocking intensity with considering the volume fraction for flame propagation and the heat release rate of the spontaneous ignition in end gas were carried out. As a result, the flame propagation velocity increased with heightening the turbulent intensity. The change of the flame propagation velocity provided the change of the volume fraction for flame propagation. The knocking intensity depended on the volume fraction for flame propagation and it reached a peak at about 0.6 in the volume fraction, when the heat release rate due to the spontaneous ignition was high enough. This agreed with the numerical prediction qualitatively. The combustion due to the spontaneous ignition in end gas was prolonged by the broader temperature variation by turbulence when the spontaneous ignition in end gas was delayed or turbulence was strong. In these cases, the knocking intensity was lowered with the prolongation of the combustion in end gas. It was to be expected that the dependency on the volume fraction for flame propagation remained the same even when the heat release rate due to the spontaneous ignition was lowered, by the numerical simulation. |
| first_indexed | 2024-12-13T01:34:31Z |
| format | Article |
| id | doaj.art-cc0866dea9234fff978aecd17e3c38bf |
| institution | Directory Open Access Journal |
| issn | 1880-5566 |
| language | English |
| last_indexed | 2024-12-13T01:34:31Z |
| publishDate | 2013-08-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Thermal Science and Technology |
| spelling | doaj.art-cc0866dea9234fff978aecd17e3c38bf2022-12-22T00:03:55ZengThe Japan Society of Mechanical EngineersJournal of Thermal Science and Technology1880-55662013-08-018346047510.1299/jtst.8.460jtstStudy on Knocking Intensity under In-Cylinder Flow Field in SI Engines Using a Rapid Compression MachineTaiga HIBI0Takashi KOHATA1Yosuke TSUMORI2Shintaro NAMIKI3Kazuya SHIMA4Masato KATSUMATA5Mitsuaki TANABE6Department of Aerospace Engineering, College of Science and Technology, Nihon UniversityDepartment of Aerospace Engineering, College of Science and Technology, Nihon UniversityDepartment of Aerospace Engineering, College of Science and Technology, Nihon UniversityDepartment of Aerospace Engineering, College of Science and Technology, Nihon UniversityDepartment of Aerospace Engineering, College of Science and Technology, Nihon UniversityFuji Heavy Industries Ltd.Department of Aerospace Engineering, College of Science and Technology, Nihon UniversityKnocking intensity under the in-cylinder flow field was investigated by using a rapid compression machine (RCM). The nitrogen diluted and non-diluted fuel-air mixtures were employed for the examination of the combustion characteristics under the in-cylinder flow field. The behaviors of flame propagation and the spontaneous ignition in end gas were observed. The analyses of the in-cylinder flow field and the dependency of the knocking intensity with considering the volume fraction for flame propagation and the heat release rate of the spontaneous ignition in end gas were carried out. As a result, the flame propagation velocity increased with heightening the turbulent intensity. The change of the flame propagation velocity provided the change of the volume fraction for flame propagation. The knocking intensity depended on the volume fraction for flame propagation and it reached a peak at about 0.6 in the volume fraction, when the heat release rate due to the spontaneous ignition was high enough. This agreed with the numerical prediction qualitatively. The combustion due to the spontaneous ignition in end gas was prolonged by the broader temperature variation by turbulence when the spontaneous ignition in end gas was delayed or turbulence was strong. In these cases, the knocking intensity was lowered with the prolongation of the combustion in end gas. It was to be expected that the dependency on the volume fraction for flame propagation remained the same even when the heat release rate due to the spontaneous ignition was lowered, by the numerical simulation.https://www.jstage.jst.go.jp/article/jtst/8/3/8_460/_pdf/-char/ensi knockknocking intensityrcmspontaneous ignitionturbulencedilutiontemperature variation |
| spellingShingle | Taiga HIBI Takashi KOHATA Yosuke TSUMORI Shintaro NAMIKI Kazuya SHIMA Masato KATSUMATA Mitsuaki TANABE Study on Knocking Intensity under In-Cylinder Flow Field in SI Engines Using a Rapid Compression Machine Journal of Thermal Science and Technology si knock knocking intensity rcm spontaneous ignition turbulence dilution temperature variation |
| title | Study on Knocking Intensity under In-Cylinder Flow Field in SI Engines Using a Rapid Compression Machine |
| title_full | Study on Knocking Intensity under In-Cylinder Flow Field in SI Engines Using a Rapid Compression Machine |
| title_fullStr | Study on Knocking Intensity under In-Cylinder Flow Field in SI Engines Using a Rapid Compression Machine |
| title_full_unstemmed | Study on Knocking Intensity under In-Cylinder Flow Field in SI Engines Using a Rapid Compression Machine |
| title_short | Study on Knocking Intensity under In-Cylinder Flow Field in SI Engines Using a Rapid Compression Machine |
| title_sort | study on knocking intensity under in cylinder flow field in si engines using a rapid compression machine |
| topic | si knock knocking intensity rcm spontaneous ignition turbulence dilution temperature variation |
| url | https://www.jstage.jst.go.jp/article/jtst/8/3/8_460/_pdf/-char/en |
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