Time-resolved measurements of intermediate concentrations in fuel-rich N-heptane oxidation behind reflected shock waves

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

doi:10.1115/GT201763344

Time-resolved measurements of intermediate concentrations in fuel-rich N-heptane oxidation behind reflected shock waves

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

Applied Catalysis&Emissions Res. Group

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

5 Scopus citations

Abstract

The chemical kinetics of the oxidation of n-heptane (C₇H₁₆) - an important reference compound for real fuels - are well studied at stoichiometric and lean conditions. However, there is only limited information on the chemical kinetics of fuel-rich combustion. In order to improve the accuracy of chemical kinetic models at these conditions, the oxidation of rich nheptane mixtures has been investigated. Combustion of n-C₇H₁₆/O₂/Ar mixtures at equivalence ratios, φ, of 2.0 behind reflected shock waves has been studied at temperatures ranging from 1075 to 1418K and at pressures ranging from 1.6 to 1.9atm. Reaction progress was monitored by recording ethylene (C₂H₄) concentration time-histories and initial n-heptane decay rates at a location 2cm from the endwall of a 13.4m long, 14cm inner diameter shock tube. Ethylene and n-heptane concentration time-histories were measured using absorption spectroscopy at 10.532μm from a tunable CO₂ laser and at around 3.4μm from a continuous wave distributed feedback interband cascade laser (ICL), respectively. The measured concentration 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, the current data are the first time-resolved nheptane and ethylene concentration measurements conducted in a shock tube at these conditions.

Original language	English
Title of host publication	Combustion, Fuels and Emissions
Publisher	American Society of Mechanical Engineers (ASME)
ISBN (Electronic)	9780791850848
DOIs	https://doi.org/10.1115/GT201763344
State	Published - 2017
Event	ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, GT 2017 - Charlotte, United States Duration: Jun 26 2017 → Jun 30 2017

Publication series

Name	Proceedings of the ASME Turbo Expo
Volume	4A-2017

Conference

Conference	ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, GT 2017
Country/Territory	United States
City	Charlotte
Period	06/26/17 → 06/30/17

Funding

This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. 1144246. 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. 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. 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 Manager.

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10.1115/GT201763344

Cite this

Loparo, Z. E., Lopez, J. G., Neupane, S., Vasu, S. S., Vodopyanov, K., & Partridge, W. P. (2017). Time-resolved measurements of intermediate concentrations in fuel-rich N-heptane oxidation behind reflected shock waves. In Combustion, Fuels and Emissions (Proceedings of the ASME Turbo Expo; Vol. 4A-2017). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT201763344

@inproceedings{be1095c3712c45c781436030ce616e59,

title = "Time-resolved measurements of intermediate concentrations in fuel-rich N-heptane oxidation behind reflected shock waves",

abstract = "The chemical kinetics of the oxidation of n-heptane (C7H16) - an important reference compound for real fuels - are well studied at stoichiometric and lean conditions. However, there is only limited information on the chemical kinetics of fuel-rich combustion. In order to improve the accuracy of chemical kinetic models at these conditions, the oxidation of rich nheptane mixtures has been investigated. Combustion of n-C7H16/O2/Ar mixtures at equivalence ratios, φ, of 2.0 behind reflected shock waves has been studied at temperatures ranging from 1075 to 1418K and at pressures ranging from 1.6 to 1.9atm. Reaction progress was monitored by recording ethylene (C2H4) concentration time-histories and initial n-heptane decay rates at a location 2cm from the endwall of a 13.4m long, 14cm inner diameter shock tube. Ethylene and n-heptane concentration time-histories were measured using absorption spectroscopy at 10.532μm from a tunable CO2 laser and at around 3.4μm from a continuous wave distributed feedback interband cascade laser (ICL), respectively. The measured concentration 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, the current data are the first time-resolved nheptane and ethylene concentration measurements conducted in a shock tube at these conditions.",

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

note = "Publisher Copyright: Copyright {\textcopyright} 2017 ASME.; ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, GT 2017 ; Conference date: 26-06-2017 Through 30-06-2017",

year = "2017",

doi = "10.1115/GT201763344",

language = "English",

series = "Proceedings of the ASME Turbo Expo",

publisher = "American Society of Mechanical Engineers (ASME)",

booktitle = "Combustion, Fuels and Emissions",

}

Loparo, ZE, Lopez, JG, Neupane, S, Vasu, SS, Vodopyanov, K & Partridge, WP 2017, Time-resolved measurements of intermediate concentrations in fuel-rich N-heptane oxidation behind reflected shock waves. in Combustion, Fuels and Emissions. Proceedings of the ASME Turbo Expo, vol. 4A-2017, American Society of Mechanical Engineers (ASME), ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, GT 2017, Charlotte, United States, 06/26/17. https://doi.org/10.1115/GT201763344

Time-resolved measurements of intermediate concentrations in fuel-rich N-heptane oxidation behind reflected shock waves. / Loparo, Zachary E.; Lopez, Joseph G.; Neupane, Sneha et al.
Combustion, Fuels and Emissions. American Society of Mechanical Engineers (ASME), 2017. (Proceedings of the ASME Turbo Expo; Vol. 4A-2017).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Time-resolved measurements of intermediate concentrations in fuel-rich N-heptane oxidation behind reflected shock waves

AU - Loparo, Zachary E.

AU - Lopez, Joseph G.

AU - Neupane, Sneha

AU - Vasu, Subith S.

AU - Vodopyanov, Konstantin

AU - Partridge, William P.

PY - 2017

Y1 - 2017

N2 - The chemical kinetics of the oxidation of n-heptane (C7H16) - an important reference compound for real fuels - are well studied at stoichiometric and lean conditions. However, there is only limited information on the chemical kinetics of fuel-rich combustion. In order to improve the accuracy of chemical kinetic models at these conditions, the oxidation of rich nheptane mixtures has been investigated. Combustion of n-C7H16/O2/Ar mixtures at equivalence ratios, φ, of 2.0 behind reflected shock waves has been studied at temperatures ranging from 1075 to 1418K and at pressures ranging from 1.6 to 1.9atm. Reaction progress was monitored by recording ethylene (C2H4) concentration time-histories and initial n-heptane decay rates at a location 2cm from the endwall of a 13.4m long, 14cm inner diameter shock tube. Ethylene and n-heptane concentration time-histories were measured using absorption spectroscopy at 10.532μm from a tunable CO2 laser and at around 3.4μm from a continuous wave distributed feedback interband cascade laser (ICL), respectively. The measured concentration 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, the current data are the first time-resolved nheptane and ethylene concentration measurements conducted in a shock tube at these conditions.

AB - The chemical kinetics of the oxidation of n-heptane (C7H16) - an important reference compound for real fuels - are well studied at stoichiometric and lean conditions. However, there is only limited information on the chemical kinetics of fuel-rich combustion. In order to improve the accuracy of chemical kinetic models at these conditions, the oxidation of rich nheptane mixtures has been investigated. Combustion of n-C7H16/O2/Ar mixtures at equivalence ratios, φ, of 2.0 behind reflected shock waves has been studied at temperatures ranging from 1075 to 1418K and at pressures ranging from 1.6 to 1.9atm. Reaction progress was monitored by recording ethylene (C2H4) concentration time-histories and initial n-heptane decay rates at a location 2cm from the endwall of a 13.4m long, 14cm inner diameter shock tube. Ethylene and n-heptane concentration time-histories were measured using absorption spectroscopy at 10.532μm from a tunable CO2 laser and at around 3.4μm from a continuous wave distributed feedback interband cascade laser (ICL), respectively. The measured concentration 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, the current data are the first time-resolved nheptane and ethylene concentration measurements conducted in a shock tube at these conditions.

UR - https://www.scopus.com/pages/publications/85026437265

U2 - 10.1115/GT201763344

DO - 10.1115/GT201763344

M3 - Conference contribution

AN - SCOPUS:85026437265

T3 - Proceedings of the ASME Turbo Expo

BT - Combustion, Fuels and Emissions

PB - American Society of Mechanical Engineers (ASME)

T2 - ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, GT 2017

Y2 - 26 June 2017 through 30 June 2017

ER -

Time-resolved measurements of intermediate concentrations in fuel-rich N-heptane oxidation behind reflected shock waves

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