کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6684664 | 501865 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Split fuel injection and Miller cycle in a large-bore engine
ترجمه فارسی عنوان
تزریق سوخت تقسیم و چرخه میلر در یک موتور بزرگ
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کلمات کلیدی
NTCBMEPSFCHRRIMEPIVCTDCLTONDIRBDCbBDCaTDCBefore bottom dead centerbTDC - BTDCNOx - NOXHeat release - آزادی حرارتیDiesel combustion - احتراق دیزلNitrogen oxides - اکسید نیتروژنcarbon oxide - اکسید کربنLow temperature oxidation - اکسیداسیون دمای پایینintake valve closing - بسته شدن شیر ورودیafter top dead center - بعد از مرده مردهbrake mean effective pressure - ترمز فشار متوسط موثرPilot injection - تزریق خلبانSplit injection - تقسیم تزریقcrank angle degree - درجه زاویه دارNegative temperature coefficient - ضریب دما منفیbefore top dead center - قبل از مرده مردهNon-dispersive infrared - مادون قرمز غیر مشتق شدهtop dead center - مرکز مرده بالاBottom Dead Center - مرکز مرده پایینSpecific fuel consumption - مصرف سوخت خاصHeat release rate - نرخ انتقال حرارتIndicated mean effective pressure - نشان دهنده فشار متوسط موثر استMiller cycle - چرخه میلرNOx reduction - کاهش NOx
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
مهندسی انرژی و فناوری های برق
چکیده انگلیسی
The upcoming emission legislation for sea-going vessels issued by the international marine organization requires drastic reduction in nitric oxides. A well-known approach for meeting these requirements is to reduce the in-cylinder temperature prior to combustion by using the so-called Miller cycle. However, the mere use of this technique presents the actual limits due to long ignition delay, which occurs when the compression temperature is very low. As a consequence, premixed combustion develops quickly, increasing the local temperature in the combustion chamber and favoring NOx formation. Splitting the fuel injection into a small pilot and a main injection can reduce the magnitude of the premixed combustion and the local in-cylinder temperatures. The work presented here is divided in two parts and is novel by being the first systematic study of split injection combined with Miller cycle in large-bore engines. In its first stage, an extensive study of the injection dwell with two intake valve closings and three timings of the main injection are analyzed. In the second stage, both injection events are shifted later in the power stroke with fixed injection dwell. Overall, the pilot injection reduced the ignition delay but dropped the peak of the premixed combustion only with the most advanced intake valve closing. This improved fuel economy, but provided no advantages as far as emissions are concerned. In addition, while increasing injection dwell reduced NOx emissions, it also increased fuel consumption. The highest achieved NOx reduction was close to 60%, with a small drawback in fuel economy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Energy - Volume 162, 15 January 2016, Pages 289-297
Journal: Applied Energy - Volume 162, 15 January 2016, Pages 289-297
نویسندگان
Matteo Imperato, Ossi Kaario, Teemu Sarjovaara, Martti Larmi,