کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
168445 457925 2016 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of post injections on mixture preparation and unburned hydrocarbon emissions in a heavy-duty diesel engine
ترجمه فارسی عنوان
تأثیر تزریق پس از تزریق مخلوط و انتشار هیدروکربن های نشتی در یک موتور دیزلی سنگین
کلمات کلیدی
احتراق کم دما، انتشار هیدروکربن نشتی، تزریقات پست دیزل سنگین
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی

This work explores the mechanisms by which a post injection can reduce unburned hydrocarbon (UHC) emissions in heavy-duty diesel engines operating at low-temperature combustion conditions. Post injections, small, close-coupled injections of fuel after the main injection, have been shown to reduce UHC in the authors’ previous work. In this work, we analyze optical data from laser-induced fluorescence of both CH2O and OH and use chemical reactor modeling to better understand the mechanism by which post injections reduce UHC emissions. The results indicate that post-injection efficacy, or the extent to which a post injection reduces UHC emissions, is a strong function of the cylinder pressure variation during the post injection. However, the data and analysis indicate that the pressure and temperature rise from the post injection combustion cannot solely explain the UHC reduction measured by both engine-out and optical diagnostics. The fluid-mechanic, thermal, and chemical interaction of the post injection with the main-injection mixture is a key part of UHC reduction; the starting action of the post jet and the subsequent entrainment of surrounding gases are likely both important processes in reducing UHC with a post injection.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Combustion and Flame - Volume 170, August 2016, Pages 111–123
نویسندگان
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