کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7159027 | 1462802 | 2018 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Experimental and computational study on the effects of injection timing on thermodynamics, combustion and emission characteristics of a natural gas (NG)-diesel dual fuel engine at low speed and low load
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کلمات کلیدی
PRRTDCRCCIAFRDDMECUHRRAPIPESBMEPIVCEEERGFVVTWHSCIntake valve closureWHTCEGRCNGaTDCLNGEER - EEAReactivity controlled compression ignition - Reactivity کنترل جرقه فشرده سازیCombustion - احتراقinternal combustion - احتراق داخلیcompression ignition - احتراق فشرده سازیEmission - انتشارEvo - اویafter top dead center - بعد از مرده مردهbrake mean effective pressure - ترمز فشار متوسط موثرdirect injection - تزریق مستقیمExhaust valve opening - دریچه خروجی دریچه بازCFD - دینامیک سیالاتComputational fluid dynamics - دینامیک سیالات محاسباتیBrake thermal efficiency - راندمان حرارتی ترمزVariable valve timing - زمان بندی متغیر شیرInjection timing - زمان تزریقSOC - سیستم روی یک تراشهStart of combustion - شروع احتراقtop dead center - مرکز مرده بالاDual-fuel engine - موتور سوخت دوگانهPressure rise rate - نرخ افزایش فشارHeat release rate - نرخ انتقال حرارتelectronic control unit - واحد کنترل الکترونیکیBTE - وسایل کمکResidual gas fraction - کسری گاز باقی ماندهNatural gas - گاز طبیعی compressed natural gas - گاز طبیعی فشردهLiquefied natural gas - گاز طبیعی مایعexhaust gas recirculation - گردش بازگشتی گاز اگزوز
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this study, the thermodynamics, combustion and emission characteristics of a NG-diesel dual fuel engine with varying pilot injection degree at low speed and low load were investigated by computational fluid dynamics (CFD) simulation and bench test. Based on tested in-cylinder pressure, the in-cylinder combustion process of NG-diesel dual fuel engine was quantitatively analyzed. On this basis, both the one-dimensional and three-dimensional CFD simulated models were built and then validated by tested data, which were used to analyze the combustion and emission characteristics of NG-diesel dual fuel engine. From this study, the effects of advanced pilot injection degree (APID) on the thermodynamics, combustion and emission characteristics of NG-diesel dual fuel engine were found. With the advancing of pilot injection degree, both the SOC and 50% combustion position are advanced, which leads the maximum in-cylinder pressure and heat release rate (HRR) to increase. The 10-50% combustion duration decreases slightly but the 50-90% combustion duration increases obviously. Meanwhile, both the effective expansion efficiency (EEE) and the percent of heat transfer loss increase, while their increase rates are different, which make the brake thermal efficiency (BTE) firstly increase and then decrease. The BSNOx increases largely while the BSTHC is almost unchanged with the advance of injection timing. Although more HC is generated in the early stage as the pilot injection degree is retarded, the post-combustion becomes clear which accelerates the oxidation of HC. All these have provided theoretical guidance and data support for improving the performance of NG-diesel dual fuel engine.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy Conversion and Management - Volume 160, 15 March 2018, Pages 426-438
Journal: Energy Conversion and Management - Volume 160, 15 March 2018, Pages 426-438
نویسندگان
Jun Shu, Jianqin Fu, Jingping Liu, Lei Zhang, Zhichao Zhao,