An experimental investigation on thermal efficiency of a compression ignition engine fueled with five gasoline-like fuels. (1st November 2017)

• Record Type: Journal Article
• Authors: Yu, Linjun; Shuai, Shijin; Li, Yanfei; Li, Bowen; Liu, Haoye; He, Xin; Wang, Zhi
• Is Part Of: Fuel. Volume 207(2017)
• Page Start: 56
• Page End: 63
• Publication Date: 2017-11-01
• Subjects: PPCI partially premixed compression ignition -- EHN ethylhexyl-nitrate -- HCCI homogenous charge compression ignition -- TDC top dead center -- GCI gasoline compression ignition -- IMEP indicated mean effective pressure -- COV coefficient of variation -- LHV lower heating value -- SOI start of injection -- HC hydrocarbon -- ISNOx indicated specific nitrogen oxides -- MPCI multiple premixed compression ignition -- PODEn polyoxymethylene dimethyl ethers -- GPF gasoline particle filter -- EGR exhaust gas recirculation -- RON research octane number -- MPRR maximum pressure rise rate -- CAD crank angle degree -- HRR heat release rate -- ITE indicated thermal efficiency -- CO carbon monoxide; Partially premixed compression ignition -- Multiple premixed compression ignition -- Thermal efficiency -- Gasoline-like fuel -- Euro VI emission standard; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2017.06.061
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: Five gasoline-like fuels were tested with PPCI and MPCI modes. Gasoline/PODE fuel achieved highest thermal efficiency of about 48.8% for both modes. NOx and soot emissions were lower than the limit of Euro VI standard in PPCI mode. Abstract: Partially Premixed Compression Ignition (PPCI) and Multiple Premixed Compression Ignition (MPCI) are two high efficiency and clean combustion strategies. This paper presents an experimental investigation on the efficiency of PPCI and MPCI combustion using five gasoline-like fuels: gasoline, gasoline/ethylhexyl-nitrate (EHN) blends, gasoline/diesel blends, gasoline/polyoxymethylene dimethyl ethers (PODEn) blends, gasoline/diesel/PODEn blends, denoted as G, GE, GD, GP, GDP, respectively. The study was conducted using a single cylinder engine that was retrofitted from a production Euro IV diesel engine. The results showed that in PPCI mode, the order of thermal efficiency from the highest to the lowest was GP, G, GDP, GE, and GD, while the order in MPCI mode was GP, GDP, GE, G, and GD. The thermal efficiency of MPCI mode was higher than that of PPCI mode, except for GP, whose thermal efficiency was the highest of about 48.8% for both modes due to the early CA50 and short combustion duration. In PPCI mode, NOx and soot emissions were below 0.4 g/kWh and 0.01 g/kWh, respectively, satisfying the Euro VI emission standard. NOx emission in MPCI mode can meet the requirement of Euro VI. However, the soot emission exceeded the limit because the second stage combustion was partially diffusion combustion, implying an extra Gasoline Particle Filter (GPF) was needed to meet the Euro VI standard. This study indicates that PPCI injection strategy alone and MPCI injection strategy with GPF are two potential ways of retrofitting a Euro IV engine to meet the Euro VI emission standard. GPF increases manufacturing cost, but higher thermal efficiency in MPCI mode could reduce the total cost of ownership due to the lower fuel consumption.