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Title: Meta-models for Ignition Delay Times with Applications to Surrogate Fuel Mixture Generation

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1357386
Report Number(s):
LLNL-CONF-725547
DOE Contract Number:
AC52-07NA27344
Resource Type:
Conference
Resource Relation:
Conference: Presented at: 10th US National Combustion Meeting, College Park, MD, United States, Apr 23 - Apr 26, 2017
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 30 DIRECT ENERGY CONVERSION; 10 SYNTHETIC FUELS

Citation Formats

Whitesides, R A, and McNenly, M J. Meta-models for Ignition Delay Times with Applications to Surrogate Fuel Mixture Generation. United States: N. p., 2017. Web.
Whitesides, R A, & McNenly, M J. Meta-models for Ignition Delay Times with Applications to Surrogate Fuel Mixture Generation. United States.
Whitesides, R A, and McNenly, M J. Sat . "Meta-models for Ignition Delay Times with Applications to Surrogate Fuel Mixture Generation". United States. doi:. https://www.osti.gov/servlets/purl/1357386.
@article{osti_1357386,
title = {Meta-models for Ignition Delay Times with Applications to Surrogate Fuel Mixture Generation},
author = {Whitesides, R A and McNenly, M J},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Feb 25 00:00:00 EST 2017},
month = {Sat Feb 25 00:00:00 EST 2017}
}

Conference:
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  • Ignition delay times were measured for gas-phase jet fuel (Jet-A and JP-8) in air behind reflected shock waves in a heated high-pressure shock tube. Initial reflected shock conditions were as follows: temperatures of 715-1229 K, pressures of 17-51 atm, equivalence ratios of 0.5 and 1, and oxygen concentrations of 10 and 21% in synthetic air. Ignition delay times were measured using sidewall pressure and OH* emission at 306 nm. Longer ignition delay times at low temperatures (715-850 K) were accessed by utilizing driver-gas tailoring methods. Also presented is a review of previous ignition delay time measurements of kerosene-based fuels andmore » recent work on surrogate fuel and kinetic mechanism development. To our knowledge, we report the first gas-phase shock tube ignition delay time data for JP-8, and our measurements for Jet-A are for a broader range of conditions than previously available. Our results have very low scatter and are in excellent agreement with the limited previous shock tube data for Jet-A. Although JP-8 and Jet-A have slightly different compositions, their ignition delay times are very similar. A simple 1/P dependence was found for ignition delay times from 874 to 1220 K for the pressure range studied for both fuels. Ignition delay time variations with equivalence ratio and oxygen concentration were also investigated. The new experimental results were compared with predictions of several kinetic mechanisms, using different jet fuel surrogate mixtures. (author)« less
  • High-temperature Arrhenius ignition delay time correlations are useful for revealing the underlying parameter dependencies of combustion models, for simplifying and optimizing combustion mechanisms for use in engine simulations, for scaling experimental data to new conditions for comparison purposes, and for guiding in experimental design. Here, we have developed a scaling relationship for Fatty Acid Methyl Ester (FAME) ignition time data taken at high temperatures in 4%O 2/Ar mixtures behind reflected shocks using an aerosol shock tube: τ ign [ms] = 2.24 x 10 -6 [ms] (P [atm]) -.41 (more » $$\phi$$) 0.30(C n) -.61 x exp $$ \left(\frac{37.1 [kcal/mol]}{\hat{R}_u [kcal / mol K] T [K]}\right) $$ In addition, we have combined our ignition delay time data for methyl decanoate, methyl palmitate, methyl oleate, and methyl linoleate with other experimental results in the literature in order to derive fuel-specific oxygen-mole-fraction scaling parameters for these surrogates. In conclusion, in this article, we discuss the significance of the parameter values, compare our correlation to others found in the literature for different classes of fuels, and contrast the above expression’s performance with correlations obtained using leading FAME kinetic models in 4%O 2/Ar mixtures.« less