Impact of higher n-butanol addition on combustion and performance of GDI engine in stoichiometric combustion. (December 2015)

• Record Type: Journal Article
• Authors: Chen, Zheng; Yang, Feng; Xue, Shuo; Wu, Zhenkuo; Liu, Jingping
• Is Part Of: Energy conversion and management. Volume 106(2016)
• Page Start: 385
• Page End: 392
• Publication Date: 2015-12
• Subjects: AFR air fuel ratio -- ATDC after top dead center -- BMEP brake mean effective pressure -- BTE brake thermal efficiency -- BSFC brake specific fuel consumption -- CA50 50% mass fraction burned -- CO carbon monoxide -- COV coefficient of variation -- CR compress ratio -- ECU electronic control unit -- FFV flex fuel vehicle -- GDI gasoline direct injection -- HC hydrocarbon -- HCCI homogeneous charge compression ignition -- HRR heat release rate -- IMEP indicated mean effective pressure -- KI knock intensity -- MON motor octane number -- NOx nitrogen oxides -- PFI port fuel injection -- PON pump octane number -- PN particle number -- RON research octane number -- SI spark ignition -- TWC three way catalyst; GDI -- n-Butanol -- Gasoline -- Stoichiometric combustion -- Efficiency -- Emission; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2015.09.051
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: Effects of 0–50% n-butanol addition on GDI engine are experimentally studied. Higher n-butanol fractions increase combustion pressure and fasten burning rate. Higher n-butanol fractions increase BSFC but improve BTE. Higher n-butanol fractions enhance combustion stability but increase knock intensity. Higher n-butanol fractions reduce exhaust temperature and NOx emissions. Abstract: An experimental study was carried out on a turbocharged gasoline direct injection (GDI) engine fueled by n-butanol/gasoline blends. Effects of n-butanol percents (15%, 30%, and 50%) on combustion and performance of the engine operating on stoichiometric combustion condition were discussed and also compared with pure gasoline in this paper. The results indicate that n-butanol/gasoline blends increase combustion pressure and pressure rise rate, fasten burning rate, and shorten ignition delay and combustion duration, as compared to pure gasoline. Moreover, these trends are impacted more evidently with increased n-butanol fraction in the blends. In addition, higher n-butanol percent of gasoline blends increase combustion temperature but decrease the temperature in the later stage of expansion stroke, which contributes to the control of exhaust temperature at high-load. With regards to engine performance, higher n-butanol percent in the blends results in increased brake specific fuel consumption (BSFC) and higher brake thermal efficiency (BTE). However, higher n-butanol addition helps to improve combustion stability but shows slightly higher knock possibility in high-load. In that case, the knock trend could be weakened by retarding ignition timing. Moreover, higher n-butanol addition significantly decreases NOx emissions, but it increases CO emissions obviously.