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Autoignition of butanol isomers/n-heptane blend fuels on a rapid compression machine in N_2/O_2/Ar mixtures

Science China(Technological Sciences) 2014年第3期57卷 461-470页

作者： YANG Zheng WANG Yue YANG Xin QIAN Yong LU XingCai HUANG Zhen Key Laboratory for Power machinery and Engineering of M. O. E. Shanghai Jiao Tong University

Ignition delay times of butanol isomers/n-heptane mixture were measured using a rapid compression machine at compressed pressures of 15,20 and 30 bar,in the compressed temperature range of 650–830 K and equivalence ratio of *** analysis and reaction fluxes analysis were performed using a detailed mechanism of blend fuels so as to evaluate the impact of n-heptane addition and temperature variation on the ignition and combustion *** the experimental conditions in this study,the blend fuels displays apparent low and high temperature reactions and a negative-temperature-coefficient(NTC)*** increasing butanol isomers mole fraction in the mixtures,the ignition delay times *** is worth noting that the suppression to n-heptane ignition from tert-butanol is very *** ignition delay time of 40/60 tert-butanol/n-heptane mixture is smaller than other three kinds of *** the increasing of tert-butanol mole fraction,the increasing range of its ignition delay time is very ***,compressed pressure has a limited effect on the ignition of blend mixture at low temperature but certain influence at medium temperature ***-butanol/n-heptane mixture is not sensitive to the *** chemical analysis indicates that butanol isomers also present the NTC behavior because of the low temperature reactivity radicals pool produced by *** fluxes analysis shows that the n-heptane addition has little impact on the reaction *** analysis shows that for the pure n-butanol,2-butanol and iso-butanol fuel,H-abstraction from the?-carbon plays the dominant role in the reactions having the inhibiting effect on the low-temperature branching,while the H-abstraction from the?-carbon can promote the ignition;for tert-butanol/n-heptane mixtures,reaction R16.H2O2(+M)OH+OH(+M)plays the leading *** n-butanol/n-heptane,iso-butanol/n-heptane mixtures,the major promoting reactions include some H-abstraction fr

关键词： butanol isomers blend fuels ignition delay rapid compression machine chemical kinetics

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Experimental investigation on combustion and unregulated emission characteristics of butanol-isomer/gasoline blends

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Journal of Central South University 2019年第8期26卷 2244-2258页

作者： LI Yuan-xu NING Zhi YAN Jun-hao School of Mechanical Electronic and Control Engineering Beijing Jiaotong UniversityBeijing 100044 China Beijing Key Laboratory of New Energy Vehicle Powertrain Beijing Jiaotong University Beijing 100044 China Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignIL 61801 USA

Effects of butanol isomers on characteristics of combustion and emission were studied on PFI SI engine. Experiments were operated under the condition of 3 and 5 bar brake mean effective pressure (BMEP) engine loads and different equivalence ratios (φ=0.83-1.25) with engine speed of 1200 r/min using blends made of 70 vol.% gasoline and 30 vol.% butanol isomers (N30, S30, I30 and T30). The results indicated that compared with gasoline, all butanol isomer blends have higher cylinder pressure. N30 has the highest and most advanced peak pressure, and T30 shows a higher brake specific fuel consumption (BSFC) and lower brake thermal efficiency (BTE). N30 presents a lower UHC emissions and I30 has slightly higher CO emissions than other blends. For unregulated emissions, compared with gasoline, butanol isomer blends have higher acetaldehyde, and N30 produces a higher emission of 1,3-butadiene than other blends. A reduction in benzene, toluene, ethylbenzene and xylene (BTEX) has been found with butanol isomer blends.

关键词： butanol isomers unregulated emission combustion characteristics gas chromatograph SI engine

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