A Study of the Mechanism Causing Pressure Waves and Knock in an SI Engine under High-Speed and Supercharged Operation
In this study, knocking over a wide range of engine speeds was visualized using an optically acssessible engine. In addition, knock under a high compression ratio and supercharged, lean combustion was investigated. The results revealed that under high-speed knock, the flame propagation velocity decl...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Society of Automotive Engineers of Japan, Inc.
2018-01-01
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| Series: | International Journal of Automotive Engineering |
| Online Access: | https://www.jstage.jst.go.jp/article/jsaeijae/9/1/9_20184085/_article/-char/ja |
| _version_ | 1797357059169058816 |
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| author | Akira Iijima Shuhei Takahata Hiroki Kudo Keito Agui Masaaki Togawa Kento Shimizu Yuki Takamura Mitsuaki Tanabe Hideo Shoji |
| author_facet | Akira Iijima Shuhei Takahata Hiroki Kudo Keito Agui Masaaki Togawa Kento Shimizu Yuki Takamura Mitsuaki Tanabe Hideo Shoji |
| author_sort | Akira Iijima |
| collection | DOAJ |
| description | In this study, knocking over a wide range of engine speeds was visualized using an optically acssessible engine. In addition, knock under a high compression ratio and supercharged, lean combustion was investigated. The results revealed that under high-speed knock, the flame propagation velocity declined when low-temperature oxidation reactions occurred. Subsequently, autoignition began locally and expanded gradually. Eventually, it was observed that a highly brilliant autoignited flame appeared and propagated through the unburned end gas at a high speed of approximately 1700-1800 m/s. This suggests that high-speed knock causes “developing detonation” in which combustion proceeds at a supersonic speed while pressure waves and the reaction front mutually interact. It was also found that strong knock occurred under supercharged, ultra-lean conditions (Compression Ratio: CR=14, Equivalence Ratio: Φ =0.5, Intake Pressure: Pin = 140 kPa). In addition, the application of exhaust gas recirculation markedly reduced strong pressure oscillations. |
| first_indexed | 2024-03-08T14:37:51Z |
| format | Article |
| id | doaj.art-05e52f7b379f4f269177c90960bee7a1 |
| institution | Directory Open Access Journal |
| issn | 2185-0992 |
| language | English |
| last_indexed | 2024-03-08T14:37:51Z |
| publishDate | 2018-01-01 |
| publisher | Society of Automotive Engineers of Japan, Inc. |
| record_format | Article |
| series | International Journal of Automotive Engineering |
| spelling | doaj.art-05e52f7b379f4f269177c90960bee7a12024-01-12T01:27:37ZengSociety of Automotive Engineers of Japan, Inc.International Journal of Automotive Engineering2185-09922018-01-0191233010.20485/jsaeijae.9.1_23A Study of the Mechanism Causing Pressure Waves and Knock in an SI Engine under High-Speed and Supercharged OperationAkira Iijima0Shuhei Takahata1Hiroki Kudo2Keito Agui3Masaaki Togawa4Kento Shimizu5Yuki Takamura6Mitsuaki Tanabe7Hideo Shoji8Nihon UniversityNihon University, Graduate School of Science and TechnologyNihon University, Graduate School of Science and TechnologyNihon University, Graduate School of Science and TechnologyNihon University, Graduate School of Science and TechnologyNihon University, Graduate School of Science and TechnologyNihon University, Graduate School of Science and TechnologyNihon UniversityNihon UniversityIn this study, knocking over a wide range of engine speeds was visualized using an optically acssessible engine. In addition, knock under a high compression ratio and supercharged, lean combustion was investigated. The results revealed that under high-speed knock, the flame propagation velocity declined when low-temperature oxidation reactions occurred. Subsequently, autoignition began locally and expanded gradually. Eventually, it was observed that a highly brilliant autoignited flame appeared and propagated through the unburned end gas at a high speed of approximately 1700-1800 m/s. This suggests that high-speed knock causes “developing detonation” in which combustion proceeds at a supersonic speed while pressure waves and the reaction front mutually interact. It was also found that strong knock occurred under supercharged, ultra-lean conditions (Compression Ratio: CR=14, Equivalence Ratio: Φ =0.5, Intake Pressure: Pin = 140 kPa). In addition, the application of exhaust gas recirculation markedly reduced strong pressure oscillations.https://www.jstage.jst.go.jp/article/jsaeijae/9/1/9_20184085/_article/-char/ja |
| spellingShingle | Akira Iijima Shuhei Takahata Hiroki Kudo Keito Agui Masaaki Togawa Kento Shimizu Yuki Takamura Mitsuaki Tanabe Hideo Shoji A Study of the Mechanism Causing Pressure Waves and Knock in an SI Engine under High-Speed and Supercharged Operation International Journal of Automotive Engineering |
| title | A Study of the Mechanism Causing Pressure Waves and Knock in an SI Engine under High-Speed and Supercharged Operation |
| title_full | A Study of the Mechanism Causing Pressure Waves and Knock in an SI Engine under High-Speed and Supercharged Operation |
| title_fullStr | A Study of the Mechanism Causing Pressure Waves and Knock in an SI Engine under High-Speed and Supercharged Operation |
| title_full_unstemmed | A Study of the Mechanism Causing Pressure Waves and Knock in an SI Engine under High-Speed and Supercharged Operation |
| title_short | A Study of the Mechanism Causing Pressure Waves and Knock in an SI Engine under High-Speed and Supercharged Operation |
| title_sort | study of the mechanism causing pressure waves and knock in an si engine under high speed and supercharged operation |
| url | https://www.jstage.jst.go.jp/article/jsaeijae/9/1/9_20184085/_article/-char/ja |
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