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Title: High-Speed Imaging of the Dynamics of H2/O2 Ignition at Low to Moderate Temperatures in a Shock Tube

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1343836
Report Number(s):
LLNL-CONF-718957
DOE Contract Number:
AC52-07NA27344
Resource Type:
Conference
Resource Relation:
Conference: Presented at: 55th AIAA Aerospace Sciences Meeting, Grapevine, TX, United States, Jan 30 - Feb 04, 2017
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 42 ENGINEERING; 29 ENERGY PLANNING, POLICY AND ECONOMY

Citation Formats

Ninnemann, E M, Pryor, O, Barak, S, Koroglu, B, Sosa, J, Ahmed, K, and Vasu, S. High-Speed Imaging of the Dynamics of H2/O2 Ignition at Low to Moderate Temperatures in a Shock Tube. United States: N. p., 2017. Web. doi:10.2514/6.2017-1796.
Ninnemann, E M, Pryor, O, Barak, S, Koroglu, B, Sosa, J, Ahmed, K, & Vasu, S. High-Speed Imaging of the Dynamics of H2/O2 Ignition at Low to Moderate Temperatures in a Shock Tube. United States. doi:10.2514/6.2017-1796.
Ninnemann, E M, Pryor, O, Barak, S, Koroglu, B, Sosa, J, Ahmed, K, and Vasu, S. Mon . "High-Speed Imaging of the Dynamics of H2/O2 Ignition at Low to Moderate Temperatures in a Shock Tube". United States. doi:10.2514/6.2017-1796. https://www.osti.gov/servlets/purl/1343836.
@article{osti_1343836,
title = {High-Speed Imaging of the Dynamics of H2/O2 Ignition at Low to Moderate Temperatures in a Shock Tube},
author = {Ninnemann, E M and Pryor, O and Barak, S and Koroglu, B and Sosa, J and Ahmed, K and Vasu, S},
abstractNote = {},
doi = {10.2514/6.2017-1796},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 23 00:00:00 EST 2017},
month = {Mon Jan 23 00:00:00 EST 2017}
}

Conference:
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  • 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%more » 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 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.« less
  • Abstract not provided.
  • Abstract not provided.
  • Iso-cetane (2,2,4,4,6,8,8-heptamethylnonane, C{sub 16}H{sub 34}) is a highly branched alkane reference compound for determining cetane ratings. It is also a candidate branched alkane representative in surrogate mixtures for diesel and jet fuels. Here new experiments and kinetic modeling results are presented for the autoignition of iso-cetane at elevated temperatures and pressures relevant to combustion in internal combustion engines. Ignition delay time measurements were made in reflected shock experiments in a heated shock tube for {phi} = 0.5, 1.0, and 1.5 iso-cetane/air mixtures at temperatures ranging from 879 to 1347 K and pressures from 8 to 47 atm. Ignition delay timesmore » were measured using electronically excited OH emission, monitored through the shock tube end wall, and piezoelectric pressure transducer measurements, made at side wall locations. A new kinetic mechanism for the description of the oxidation of iso-cetane is presented that is developed based on a previous mechanism for iso-octane. Computed results from the mechanism are found in good agreement with the experimental measurements. To our knowledge, the ignition time measurements for iso-cetane presented here are the first of their kind. (author)« less