Effects of substitution on counterflow ignition and extinction of C3 and C4 alcohols

Adamu Alfazazi, Ulrich Niemann, Hatem Selim, Robert J. Cattolica, Mani Sarathy

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Dwindling reserves and inherent uncertainty in the price of conventional fuels necessitates a search for alternative fuels. Alcohols represent a potential source of energy for the future. The structural features of an alcohol fuel have a direct impact on combustion properties. In particular, substitution in alcohols can alter the global combustion reactivity. In this study, experiments and numerical simulations were conducted to investigate the critical conditions of extinction and autoignition of n-propanol, 1-butanol, iso-propanol and iso-butanol in non-premixed diffusion flames. Experiments were carried out in the counterflow configuration, while simulations were conducted using a skeletal chemical kinetic model for the C3 and C4 alcohols. The fuel stream consists of the pre-vaporized fuel diluted with nitrogen, while the oxidizer stream is air. The experimental results show that autoignition temperatures of the tested alcohols increase in the following order: iso-propanol > iso-butanol > 1-butanol ≈ n-propanol. The simulated results for the branched alcohols agree with the experiments, while the autoignition temperature of 1-butanol is slightly higher than that of n-propanol. For extinction, the experiments show that the extinction limits of the tested fuels increase in the following order: n-propanol ≈ 1-butanol > iso-butanol > iso-propanol. The model suggests that the extinction limits of 1-butanol is slightly higher than n-propanol with extinction strain rate of iso-butanol and iso-propanol maintaining the experimentally observed trend. The transport weighted enthalpy (TWE) and radical index (Ri) concepts were utilized to rationalize the observed reactivity trends for these fuels.
Original languageEnglish (US)
Pages (from-to)6091-6097
Number of pages7
JournalEnergy & Fuels
Issue number7
StatePublished - Jul 2016

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was performed by the Clean Combustion Res
earch Center with funding from King
Abdullah University of Science and Technology (KAUS
T) and Saudi Aramco under the
FUELCOM program. Research reported in this publicat
ion was also supported by competitive
research funding from KAUST. The research at the Un
iversity of California at San Diego was
supported by UC Discovery/West Biofuels, LLC Grant
# GCP06(10228. We thank Professor
Kalyanasundaram Seshadri, Samah Y. Mohammed and Nou
r Atef for their contribution.


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