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2018-01-1791.pdf | 516.58 kB | Adobe PDF | 見る/開く |
タイトル: | Improvement of Thermal Efficiency in a Diesel Engine with High-Pressure Split Main Injection |
著者: | Horibe, Naoto https://orcid.org/0000-0002-7126-2986 (unconfirmed) Bao, Zhichao Taguchi, Tomoki Egoshi, Kenta Kawanabe, Hiroshi https://orcid.org/0000-0002-9525-4841 (unconfirmed) Ishiyama, Takuji |
著者名の別形: | 堀部, 直人 包, 智超 田口, 智喜 江越, 賢太 川那辺, 洋 石山, 拓二 |
発行日: | 10-Sep-2018 |
出版者: | SAE International |
誌名: | SAE Technical Papers |
論文番号: | 2018-01-1791 |
抄録: | This study aims to utilize high-pressure split-main injection for improving the thermal efficiency of diesel engines. A series of experiments was conducted using a single-cylinder diesel engine under conditions of an engine speed of 2, 250 rpm and a gross indicated mean effective pressure of 1.43 MPa. The injection pressure was varied in the range of 160–270 MPa. Split-main injection was applied to reduce cooling loss under the condition of high injection pressure, and the split ratio and the number of injection stages were varied. The dwell of the split main injection was set to near-zero in order to minimize the elongation of the total injection duration. As a result, thermal efficiency was improved owing to the combined increase in injection pressure, advanced injection timing, and split-main injection. According to the analysis of heat balance, a larger amount of the second part of the main injection decreased the cooling loss and increased the exhaust loss. Computational fluid dynamics calculations were performed to reveal the causes of the lower cooling loss; however, the results could not capture the experimental trend when using an ordinary spray cone angle. While using a wider spray angle for the second part of main injection, the calculated trend improved. The total cooling loss depends on the balance between the cooling losses by the first and second main sprays. |
記述: | International Powertrains, Fuels & Lubricants Meeting |
著作権等: | This is the accepted manuscript of the article, which has been published in final form at https://doi.org/10.4271/2018-01-1791. The full-text file will be made open to the public on 10 March 2019 in accordance with publisher's 'Terms and Conditions for Self-Archiving' This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/237661 |
DOI(出版社版): | 10.4271/2018-01-1791 |
出現コレクション: | 学術雑誌掲載論文等 |
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