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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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Measurement on Turbulent Premixed Flame Structure of CH4/H2/Air Mixtures with CO2 Dilution

Xi'an Jiaotong Univ.-Jinhua Wang, Senbin Yu, Yaohui Nie, Zuohua Huang
Xi'an Jiotong Univ.-Wu Jin
Published 2015-09-01 by SAE International in United States
Measurement on turbulent premixed CH4/H2/air flames was studied experimentally. Hydrogen blending ratio is defined as the ratio of hydrogen to fuel, while CO2 dilution ratio is defined as the mole fraction of CO2 to those of mixture. Hydrogen blending ratios up to 0.2 and CO2 dilution ratios up to 0.1 were studied. OH profile of the instantaneous flame front was detected using the OH-PLIF visualizations on a turbulent Bunsen burner. 500 OH-PLIF images were used to obtain the turbulent burning velocity and calculate flame surface density, and 280 images was used to calculate the local curvature radius.
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