کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8071834 | 1521400 | 2018 | 36 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of altitude on combustion and ignition characteristics of speed-up period during cold start in a diesel engine
ترجمه فارسی عنوان
اثرات ارتفاع بر روی احتراق و ویژگی های احتراق سرعت در طی شروع سرد در یک موتور دیزل
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کلمات کلیدی
موتور دیزل، محیط پلاتو، شروع سرد سرعت دادن، احتراق سینتیک واکنش شیمیایی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی (عمومی)
چکیده انگلیسی
Altitude has a significant effect on the combustion of diesel engines during cold start, especially during speed-up. In this study, combustion characteristics of speed-up period were investigated using an experimental test on a heavy-duty diesel engine with an intake and exhaust pressure controlled by the plateau simulation test system to simulate altitude conditions including 0â¯m, 3000â¯m and 4500â¯m. Further effects of altitude on ignition characteristics of diesel engine were accomplished through a zero-dimensional thermodynamic model coupled with a detailed kinetic model. Results indicated that as the altitude rose from 0â¯m to 3000â¯m, the pressure in the cylinder was reduced, the number of diesel engine speed-up cycles increased, and the rising speed ratio decreased during speed-up. There was a misfire after the fifth cycle at an altitude of 4500â¯m, and the rising speed ratio was significantly reduced. Through analysis of fuel injection, air intake and ignition phase, we confirmed that the misfire at the high 4500â¯m altitude was caused by the ignition delay, which was mainly controlled by chemical reaction during cold start. In the detailed kinetic study, the hot-flame and blue-flame reactions slowed down in the chemical reaction of the mixture as the altitude rose. The higher altitude enhanced the H-atom abstraction, but weakened the second O2 addition and the peroxyalkylhydroperoxide isomerization. The decomposition reaction was enhanced. As a result, the overall reaction rate and the heat release fraction deteriorated, extending significantly the negative temperature coefficient (NTC) duration of the ignition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy - Volume 150, 1 May 2018, Pages 164-175
Journal: Energy - Volume 150, 1 May 2018, Pages 164-175
نویسندگان
Zechao Kan, Zhiyuan Hu, Diming Lou, Piqiang Tan, Zhiyi Cao, Zhenhuan Yang,