skip to main content

DOE PAGESDOE PAGES

Title: New insights into the shock tube ignition of H 2/O 2 at low to moderate temperatures using high-speed end-wall imaging

In this study, the effects of pre-ignition energy releases on H 2—O 2 mixtures were explored in a shock tube with the aid of high-speed imaging and conventional pressure and emission diagnostics. Ignition delay times and time-resolved camera image sequences were taken behind the reflected shockwaves for two hydrogen mixtures. High concentration experiments spanned temperatures between 858 and 1035 K and pressures between 2.74 and 3.91 atm for a 15% H 2\18% O 2\Ar mixture. Low concentration data were also taken at temperatures between 960 and 1131 K and pressures between 3.09 and 5.44 atm for a 4% H 2\2% O 2\Ar mixture. These two model mixtures were chosen as they were the focus of recent shock tube work conducted in the literature. Experiments were performed in both a clean and dirty shock tube facility; however, no deviations in ignition delay times between the two types of tests were apparent. The high-concentration mixture (15%H 2\18%O 2\Ar) experienced energy releases in the form of deflagration flames followed by local detonations at temperatures < 1000 K. Measured ignition delay times were compared to predictions by three chemical kinetic mechanisms: GRI-Mech 3.0, AramcoMech 2.0, and Burke's et al. (2012) mechanisms. It was foundmore » that when proper thermodynamic assumptions are used, all mechanisms were able to accurately predict the experiments with superior performance from the well-validated AramcoMech 2.0 and Burke et al. mechanisms. Current work provides better guidance in using available literature hydrogen shock tube measurements, which spanned more than 50 years but were conducted without the aid of high-speed visualization of the ignition process, and their modeling using combustion kinetic mechanisms.« less
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1]
  1. Univ. of Central Florida, Orlando, FL (United States)
  2. Univ. of Central Florida, Orlando, FL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-729739
Journal ID: ISSN 0010-2180
Grant/Contract Number:
AC52-07NA27344; FE0025260; 1144246
Type:
Accepted Manuscript
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 187; Journal Issue: C; Journal ID: ISSN 0010-2180
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE; National Aeronautic and Space Administration (NASA); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Hydrogen; Shock tube; Chemical kinetics; High-speed imaging
OSTI Identifier:
1404847

Ninnemann, Erik, Koroglu, Batikan, Pryor, Owen, Barak, Samuel, Nash, Leigh, Loparo, Zachary, Sosa, Jonathan, Ahmed, Kareem, and Vasu, Subith. New insights into the shock tube ignition of H2/O2 at low to moderate temperatures using high-speed end-wall imaging. United States: N. p., Web. doi:10.1016/j.combustflame.2017.08.021.
Ninnemann, Erik, Koroglu, Batikan, Pryor, Owen, Barak, Samuel, Nash, Leigh, Loparo, Zachary, Sosa, Jonathan, Ahmed, Kareem, & Vasu, Subith. New insights into the shock tube ignition of H2/O2 at low to moderate temperatures using high-speed end-wall imaging. United States. doi:10.1016/j.combustflame.2017.08.021.
Ninnemann, Erik, Koroglu, Batikan, Pryor, Owen, Barak, Samuel, Nash, Leigh, Loparo, Zachary, Sosa, Jonathan, Ahmed, Kareem, and Vasu, Subith. 2017. "New insights into the shock tube ignition of H2/O2 at low to moderate temperatures using high-speed end-wall imaging". United States. doi:10.1016/j.combustflame.2017.08.021. https://www.osti.gov/servlets/purl/1404847.
@article{osti_1404847,
title = {New insights into the shock tube ignition of H2/O2 at low to moderate temperatures using high-speed end-wall imaging},
author = {Ninnemann, Erik and Koroglu, Batikan and Pryor, Owen and Barak, Samuel and Nash, Leigh and Loparo, Zachary and Sosa, Jonathan and Ahmed, Kareem and Vasu, Subith},
abstractNote = {In this study, the effects of pre-ignition energy releases on H2—O2 mixtures were explored in a shock tube with the aid of high-speed imaging and conventional pressure and emission diagnostics. Ignition delay times and time-resolved camera image sequences were taken behind the reflected shockwaves for two hydrogen mixtures. High concentration experiments spanned temperatures between 858 and 1035 K and pressures between 2.74 and 3.91 atm for a 15% H2\18% O2\Ar mixture. Low concentration data were also taken at temperatures between 960 and 1131 K and pressures between 3.09 and 5.44 atm for a 4% H2\2% O2\Ar mixture. These two model mixtures were chosen as they were the focus of recent shock tube work conducted in the literature. Experiments were performed in both a clean and dirty shock tube facility; however, no deviations in ignition delay times between the two types of tests were apparent. The high-concentration mixture (15%H2\18%O2\Ar) experienced energy releases in the form of deflagration flames followed by local detonations at temperatures < 1000 K. Measured ignition delay times were compared to predictions by three chemical kinetic mechanisms: GRI-Mech 3.0, AramcoMech 2.0, and Burke's et al. (2012) mechanisms. It was found that when proper thermodynamic assumptions are used, all mechanisms were able to accurately predict the experiments with superior performance from the well-validated AramcoMech 2.0 and Burke et al. mechanisms. Current work provides better guidance in using available literature hydrogen shock tube measurements, which spanned more than 50 years but were conducted without the aid of high-speed visualization of the ignition process, and their modeling using combustion kinetic mechanisms.},
doi = {10.1016/j.combustflame.2017.08.021},
journal = {Combustion and Flame},
number = C,
volume = 187,
place = {United States},
year = {2017},
month = {9}
}