Ignition delay time and speciation of dibutyl ether at high pressures

Hakimov, Khaiyom; Arafin, Farhan; Aljohani, Khalid; Djebbi, Khalil; Ninnemann, Erik; Vasu, Subith S.; Farooq, Aamir

Ignition delay time and speciation of dibutyl ether at high pressures

Files

DBE CnF Manuscript rev final unmarked.docx.pdf (2.99 MB)

Type

Article

Authors

Hakimov, Khaiyom

Arafin, Farhan
Aljohani, Khalid
Djebbi, Khalil
Ninnemann, Erik

Vasu, Subith S.
Farooq, Aamir

KAUST Department

Chemical Kinetics & Laser Sensors Laboratory
Clean Combustion Research Center
Mechanical Engineering
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division

Online Publication Date

2020-10-14

Print Publication Date

2021-01

Date

2020-10-14

Submitted Date

2020-06-27

Abstract

Dibutyl ether (DBE) is a promising biofuel due to its high cetane number (~ 100) and high volumetric energy density (31.6 MJ/L). It could either be used directly in compression ignition engines or blended with other conventional or renewable fuels. Oxidation and pyrolysis kinetics of DBE are not well known, particularly at high pressures. In this work, we have experimentally investigated the chemical kinetics of DBE in three domains: (a) ignition delay time measurements in a rapid compression machine over T = 550–650 K, P = 10, 20, 40 bar, ϕ = 0.5, 1; (b) ignition delay time measurements in a shock tube over T = 900–1300 K, P = 20, 40 bar, ϕ = 0.5, 1; (c) laser-based carbon monoxide speciation measurements in a shock tube during DBE pyrolysis and oxidation over T = 1100–1400 K, P = 20 bar. Pressure time-histories measured in RCM experiments exhibited unique 3-stage and 4-stage ignition behavior predominantly at fuel-lean conditions. Experimental data were compared with the predictions of two recent chemical kinetic models of DBE. Sensitivity analyses were carried out to identify key reactions which may have caused the discrepancy between experiments and simulations. It was found that the rate of decomposition of DBE may need to be revisited to improve the oxidative and pyrolytic predictions of DBE kinetic model.

Citation

Hakimov, K., Arafin, F., Aljohani, K., Djebbi, K., Ninnemann, E., Vasu, S. S., & Farooq, A. (2021). Ignition delay time and speciation of dibutyl ether at high pressures. Combustion and Flame, 223, 98–109. doi:10.1016/j.combustflame.2020.09.028

Acknowledgements

The work of KAUST authors was sponsored by the Office of Sponsored Research (OSR) at King Abdullah University of Science and Technology (KAUST). Research at UCF is supported by the U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) under Award Numbers DE-EE0007982 and DE-EE0007984 (Co-Optima).