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Title: Smoke Reduction Effects by Post Injection for Various Injection Parameters and Combustion Chamber Shapes in a Diesel Engine
Authors: Horibe, Naoto  kyouindb  KAKEN_id  orcid (unconfirmed)
Komizo, Tatsuya
Sumimoto, Takashi
Wang, Hao
Ishiyama, Takuji  kyouindb  KAKEN_id
Author's alias: 堀部, 直人
小溝, 達也
隅本, 貴
Wang, Hao
石山, 拓二
Issue Date: 13-Oct-2014
Publisher: SAE International
Journal title: SAE Technical Papers
Thesis number: 2014-01-2634
Abstract: A series of experiments using a single-cylinder direct injection diesel engine was conducted to investigate the smoke reduction effect of post injection while varying numerous parameters: the post-injection quantity, post-injection timing, injection pressure, main-injection timing, intake pressure, number of injection nozzle orifices, and combustion chamber shape. The experiments were performed under a fixed NOx emission condition by selecting the total injection quantities needed to obtain the predetermined smoke emission levels without post injection. The smoke reduction effects were compared when changing the post injection timing for different settings of the above parameters, and explanations were found for the measured smoke emission trends. The results indicate that close post injection provides lower smoke emission for a combination of a reentrant combustion chamber and seven-hole nozzle. The same trend was also found in the tests that varied the injection pressure, main-injection timing, and intake pressure. However, a lower sensitivity of the smoke emission to the post injection timing was observed when using an injection nozzle with a larger number of orifices and a toroidal combustion chamber. The smoke reduction rate at the best post injection timing was higher for a lower injection pressure, larger number of nozzle orifices, and toroidal combustion chamber. The reasons for these trends were investigated, giving attention to the relation between the main spray flames and post sprays.
Description: SAE 2014 International Powertrain, Fuels & Lubricants Meeting
Rights: This is the accepted manuscript of the article, which has been published in final form at
The full-text file will be made open to the public on 13 April 2015 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。
DOI(Published Version): 10.4271/2014-01-2634
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