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Study on the Laminar Characteristics of Ethanol, n-Butanol and n-Pentanol Flames

Xi’an Jiaotong University-Qianqian Li, Yu Cheng, Wu Jin, Zhaoyang Chen, Zuohua Huang
Published 2015-09-01 by SAE International in United States
Due to serious energy crisis and pollution problem, interest in research of the alternative fuels is increasing over the world. Alcohol fuels are always considered to be promising alternative fuels. Lower alcohols owning high octane number is good octane enhancer for SI (Spark ignition) engine, however is difficult to be used in CI (Compression Ignition) engines. Higher alcohols like pentanol with higher energy content, poor water solubility and higher cetane number are good choice for the CI engines. In this study, laminar flame behaviors of ethanol-air, n-butanol-air and n-pentanol-air mixtures at 393 K and 0.1 MPa are compared and analyzed with the spherical propagating flames. Comparison of the laminar flame speeds measured in the previous studies (Li et al.) show that laminar flame speed of ethanol is the fastest with slower flame speed of n-butanol and n-pentanol at lean mixture. At rich mixture, three alcohols present very close values. The effective Lewis number of n-pentanol is the biggest, and then n-butanol and ethanol. The difference among the three fuels is decreasing with the increase of…
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Effects of n-Butanol Addition on the Performance and Emissions of a Turbocharged Common-Rail Diesel Engine

Xi'an Jiaotong University-Gen Chen, Wu Yu, Qianqian Li, Zuohua Huang
Published 2012-04-16 by SAE International in United States
As a biomass-based renewable fuel, n-butanol has many superior properties, such as better miscibility in diesel, higher energy content and higher cetane number, which make it an attractive alternative or blending component to diesel fuel compared with its alcohol competitors, methanol and ethanol. Although n-butanol has so many advantages, literature on the effects of its addition on diesel engines are still not sufficient. In this study, the influences of n-butanol addition on the performance and emissions of a turbocharged common-rail diesel engine are investigated under different speed and load conditions. The fuel consumption rate and the gaseous emissions (CO, CO₂, HC, and NOx) are measured. Moreover, an electrical low pressure impactor (ELPI) is utilized to study the particulate matter (PM) number-size distributions under different conditions. The results show that as more n-butanol is added, the brake fuel specific consumption is increased while only a slight variation of the fuel conversion efficiency is found. As for the gaseous emissions, the concentration of CO and CO₂ remain almost unchanged, the HC emission increases obviously, and the NOx…
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