Fuel-Rich N-Heptane Oxidation: A Shock Tube And Laser Absorption Study

Keywords

Chemical kinetics; Fuel rich; Laser absorption; n-Heptane; Shock tube

Abstract

The chemical kinetics of n-heptane (n-C7H16) – an important reference compound for real fuels – oxidation are well studied at stoichiometric and lean conditions. However, there is only limited information on the n-heptane chemical kinetics in fuel-rich combustion. In order to verify the accuracy of chemical kinetic models at these conditions, the oxidation of rich n-heptane mixtures has been investigated. Combustion of n-C7H16/O2/Ar mixtures at equivalence ratios, φ, of 2.0 and 3.0 behind reflected shock waves has been studied at temperatures ranging from 1066 to 1502 K and at pressures ranging from 1.4 to 6.2 atm. Reaction progress was monitored by recording pressure and absorption time-histories of ethylene (C2H4) and n-heptane at a location 2 cm from the endwall of a 14-cm inner diameter shock tube. Ethylene and n-heptane absorption time-histories were measured, respectively, using absorption spectroscopy at 10.532 μm from a tunable CO2 laser and at around 3.4 μm from a continuous wave distributed feedback interband cascade laser (ICL). The measured absorption time-histories were compared with modeled predictions from the Lawrence Livermore National Lab (LLNL) detailed n-heptane reaction mechanism. To the best of our knowledge, current data are the first time-resolved n-heptane and ethylene concentration measurements conducted in a shock tube at these conditions.

Publication Date

1-1-2017

Publication Title

Combustion and Flame

Volume

185

Number of Pages

220-233

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.combustflame.2017.07.016

Socpus ID

85026464586 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85026464586

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