کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6686164 | 501870 | 2015 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effect of ethanol blending on mixture formation, combustion and soot emission studied in an optical DISI engine
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کلمات کلیدی
air–fuel ratioLIFaTDCE20IMEPDISIFlame developmentNEDCbTDC - BTDCLII - LIIResearch Octane Number - اکتان شماره تحقیقafter top dead center - بعد از مرده مردهBioethanol - بیواتانولdirect injection spark ignition - جرقه مستقیم تزریقExhaust valve - دریچه خروجیCarbon dioxide - دیاکسید کربنHydroxyl radical - رادیکال هیدروکسیلCrank Angle - زاویه میل لنگMixture formation - شکل گیری مخلوطLaser induced fluorescence - فلورسانس ناشی از لیزرbefore top dead center - قبل از مرده مردهLaser induced incandescence - لیزر ناشی از ریزش موparticle matter - ماده ذراتIndicated mean effective pressure - نشان دهنده فشار متوسط موثر استOperating point - نقطه عملیاتیTEA - چایnew European driving cycle - چرخه ی جدید اروپاییCO2 - کربن دیاکسید
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
مهندسی انرژی و فناوری های برق
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چکیده انگلیسی
In various research studies, ethanol blended fuels have shown reduced particulate matter (PM) emissions in comparison to gasoline and its surrogate fuels in direct-injection spark-ignition (DISI) engines. However, there are also studies reporting increased particulate concentration for fuels with low ethanol content. In this work the mixture formation and sooting combustion behavior of isooctane and the mixture E20 (20Â vol% of ethanol in isooctane) is analyzed for catalyst heating operation. These operating conditions are critical as they strongly contribute to overall soot emissions in driving cycles. Simultaneous high speed imaging of OHâ-chemiluminescence and natural soot luminosity measurements are performed in combination with primary particle concentration measurements using a laser induced incandescence (LII) sensor in the engine exhaust duct. At these operating conditions E20 exhibits a higher sooting tendency as compared to isooctane. In order to identify the reason for increased soot formation, the mixture formation process is analyzed by planar laser induced fluorescence (LIF) measurements. The results show that soot was formed in fuel rich regions with incomplete evaporated fuel droplets remaining from the injection event. A different evaporation process of E20 fuel spray and mixing behavior is indicated showing a more compact rich mixture cloud with surrounding lean areas near the spark plug region. This mixture stratification is characterized by higher cyclic variations and constitutes a significant source of soot formation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Energy - Volume 156, 15 October 2015, Pages 783-792
Journal: Applied Energy - Volume 156, 15 October 2015, Pages 783-792
نویسندگان
Michael Storch, Florian Hinrichsen, Michael Wensing, Stefan Will, Lars Zigan,