Fuel-rich n-heptane oxidation: A shock tube and laser absorption study

Zachary E. Loparo; Joseph G. Lopez; Sneha Neupane; William P. Partridge; Konstantin Vodopyanov; Subith S. Vasu

doi:10.1016/j.combustflame.2017.07.016

Fuel-rich n-heptane oxidation: A shock tube and laser absorption study

Zachary E. Loparo, Joseph G. Lopez, Sneha Neupane, William P. Partridge, Konstantin Vodopyanov, Subith S. Vasu

Applied Catalysis&Emissions Res. Group

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

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.

Original language	English
Pages (from-to)	220-233
Number of pages	14
Journal	Combustion and Flame
Volume	185
DOIs	https://doi.org/10.1016/j.combustflame.2017.07.016
State	Published - 2017

Funding

This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant no. 1144246. Donors of the American Chemical Society Petroleum Research Fund and the Defense Threat Reduction Agency (Grant number: HDTRA1-16-1-0009) are acknowledged for partial financial support. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. J.L. acknowledges funding provided by the National Aeronautics and Space Administration Florida Space Grant Consortium. The authors thank assistance from Owen Pryor, Leigh Nash, and Sam Barak during UCF shock tube experiments. The Oak Ridge National Laboratory research was sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office, with Gurpreet Singh as the Program Managers.

Funders	Funder number
National Aeronautics and Space Administration Florida Space Grant Consortium
Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office
National Science Foundation
U.S. Department of Energy
Directorate for Education and Human Resources	1144246
Defense Threat Reduction Agency	HDTRA1-16-1-0009
American Chemical Society Petroleum Research Fund

Keywords

Chemical kinetics
Fuel rich
Laser absorption
Shock tube
n-Heptane

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10.1016/j.combustflame.2017.07.016

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title = "Fuel-rich n-heptane oxidation: A shock tube and laser absorption study",

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.",

keywords = "Chemical kinetics, Fuel rich, Laser absorption, Shock tube, n-Heptane",

author = "Loparo, {Zachary E.} and Lopez, {Joseph G.} and Sneha Neupane and Partridge, {William P.} and Konstantin Vodopyanov and Vasu, {Subith S.}",

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T2 - A shock tube and laser absorption study

AU - Loparo, Zachary E.

AU - Lopez, Joseph G.

AU - Neupane, Sneha

AU - Partridge, William P.

AU - Vodopyanov, Konstantin

AU - Vasu, Subith S.

PY - 2017

Y1 - 2017

N2 - 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.

AB - 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.

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Fuel-rich n-heptane oxidation: A shock tube and laser absorption study

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