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 Octane number stratifed mixture preparation by gasoline–ethanol dual injection in SI engines
Tác giả hoặc Nhóm tác giả: Bùi Văn GaTrần Văn NamNguyễn Quang TrungNguyễn Văn ĐôngHuỳnh Tấn Tiến
Nơi đăng: International Journal of Environmental Science and Technology 2018; Số: DOI 10.1007/s13762-018-1942-1;Từ->đến trang: 2-16;Năm: 2018
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
High octane number is one of the attractive properties of ethanol. Appropriate distribution of ethanol vapor concentrations in combustion chamber at the end of the compression process could suppress engine knock phenomena and hence improve performance and reduce pollutants emission of spark ignition engines fueled with gasoline–ethanol. This paper presents numerical simulation results of a new concept of octane number stratifed charge mixture via dual injection of ethanol and gasoline. The principle of the concept is the optimization of fuel vapor concentrations distribution in combustion chamber to ensure high ethanol concentrations in zone risk of knock. Two dual-injection schemas have been studied: (1) port inject of gasoline and direct injection of ethanol and (2) separate port injection of gasoline and ethanol through two opposite intake manifolds. In the frst case, direct injection of ethanol in axial direction did not result in ethanol concentration stratifcation. Stratifcation occurred when direct injection of ethanol in radial direction started later than port injection of gasoline. In the second case, signifcant stratifcation of ethanol concentrations occurred when ethanol injection started earlier than gasoline injection. In the combustion chamber, high ethanol concentration was found near the ethanol injection inlet port, whereas high equivalence ratio was found in the opposite side. Thus, the location of the spark plug in the opposite side of ethanol injector is optimal for improving anti-knock performance of engine fueled with ethanol gasoline at a given fuel ratio.
ABSTRACT
High octane number is one of the attractive properties of ethanol. Appropriate distribution of ethanol vapor concentrations in combustion chamber at the end of the compression process could suppress engine knock phenomena and hence improve performance and reduce pollutants emission of spark ignition engines fueled with gasoline–ethanol. This paper presents numerical simulation results of a new concept of octane number stratifed charge mixture via dual injection of ethanol and gasoline. The principle of the concept is the optimization of fuel vapor concentrations distribution in combustion chamber to ensure high ethanol concentrations in zone risk of knock. Two dual-injection schemas have been studied: (1) port inject of gasoline and direct injection of ethanol and (2) separate port injection of gasoline and ethanol through two opposite intake manifolds. In the frst case, direct injection of ethanol in axial direction did not result in ethanol concentration stratifcation. Stratifcation occurred when direct injection of ethanol in radial direction started later than port injection of gasoline. In the second case, signifcant stratifcation of ethanol concentrations occurred when ethanol injection started earlier than gasoline injection. In the combustion chamber, high ethanol concentration was found near the ethanol injection inlet port, whereas high equivalence ratio was found in the opposite side. Thus, the location of the spark plug in the opposite side of ethanol injector is optimal for improving anti-knock performance of engine fueled with ethanol gasoline at a given fuel ratio.
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