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Simulated production of OH, HO2, CH2O, and CO2 during dilute fuel oxidation can predict 1st-stage ignition delays

Journal Article · · Combustion and Flame
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  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Chemical kinetics simulations are used to explore whether detailed measurements of relevant chemical species during the oxidation of very dilute fuels (less than 1 Torr partial pressure) in a high-pressure plug flow reactor (PFR) can predict autoignition propensity. We find that for many fuels the timescale for the onset of spontaneous oxidation in dilute fuel/air mixtures in a simple PFR is similar to the 1st-stage ignition delay time (IDT) at stoichiometric engine-relevant conditions. For those fuels that deviate from this simple trend, the deviation is closely related to the peak rate of production of OH, HO2, CH2O, and CO2 formed during oxidation. We use these insights to show that an accurate correlation between simulated profiles of these species in a PFR and 1st-stage IDT can be developed using convolutional neural networks. Our simulations suggest that the accuracy of such a correlation is 10–50%, which is appropriate for rapid fuel screening and may be sufficient for predictive fuel performance modeling.

Research Organization:
Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1601435
Alternate ID(s):
OSTI ID: 1691873
Report Number(s):
SAND--2019-10878J; 679398
Journal Information:
Combustion and Flame, Journal Name: Combustion and Flame Vol. 216; ISSN 0010-2180
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (61)

The reaction kinetics of dimethyl ether. I: High-temperature pyrolysis and oxidation in flow reactors journal January 2000
Experimental measurements and kinetic modeling of CO/H 2 /O 2 /NO x conversion at high pressure journal August 2008
Experimental measurements and kinetic modeling of CH 4 /O 2 and CH 4 /C 2 H 6 /O 2 conversion at high pressure journal December 2008
ChemKED: A Human- and Machine-Readable Data Standard for Chemical Kinetics Experiments: CHEMKED: A HUMAN- AND MACHINE-READABLE DATA STANDARD FOR CHEMICAL KINETICS EXPERIMENTS journal January 2018
On the Interpretation and Correlation of High-Temperature Ignition Delays in Reactors with Varying Thermodynamic Conditions: INTERPRETATION AND CORRELATION OF HIGH-TEMPERATURE IGNITION DELAYS journal April 2018
The oxidation of methane at elevated pressures: Experiments and modeling journal May 1994
Flow reactor study of the effect of pressure on the thermal de-NO x process journal October 2001
A comprehensive modeling study of iso-octane oxidation journal May 2002
Oxidation and combustion of the n-hexene isomers: A wide range kinetic modeling study journal December 2008
Detailed chemical kinetic mechanism for the oxidation of biodiesel fuels blend surrogate journal May 2010
A comprehensive chemical kinetic combustion model for the four butanol isomers journal June 2012
The predictive capability of an automatically generated combustion chemistry mechanism: Chemical structures of premixed iso-butanol flames journal November 2013
The role of global and detailed kinetics in the first-stage ignition delay in NTC-affected phenomena journal November 2013
A comprehensive experimental and modeling study of iso-pentanol combustion journal December 2013
An experimental and modeling study of shock tube and rapid compression machine ignition of n-butylbenzene/air mixtures journal January 2014
Understanding low-temperature first-stage ignition delay: Propane journal October 2015
An ignition delay time and chemical kinetic modeling study of the pentane isomers journal January 2016
A comprehensive experimental and modeling study of isobutene oxidation journal May 2016
An updated experimental and kinetic modeling study of n-heptane oxidation journal October 2016
An extensive experimental and modeling study of 1-butene oxidation journal July 2017
Estimating fuel octane numbers from homogeneous gas-phase ignition delay times journal February 2018
Theory of first-stage ignition delay in hydrocarbon NTC chemistry journal February 2018
A model of tetrahydrofuran low-temperature oxidation based on theoretically calculated rate constants journal May 2018
Manifestation of octane rating, fuel sensitivity, and composition effects for gasoline surrogates under advanced compression ignition conditions journal June 2018
Laminar flow reactor experiments for ignition delay time and species measurements at low temperatures: Linear alkanes and dimethyl ether journal April 2019
Detailed kinetic modeling of dimethoxymethane. Part II: Experimental and theoretical study of the kinetics and reaction mechanism journal July 2019
Predicting fuel research octane number using Fourier-transform infrared absorption spectra of neat hydrocarbons journal November 2016
Relating the octane numbers of fuels to ignition delay times measured in an ignition quality tester (IQT) journal January 2017
A novel reactivity index for SI engine fuels by separated weak flames in a micro flow reactor with a controlled temperature profile journal June 2019
Dimethyl ether autoignition in a rapid compression machine: Experiments and chemical kinetic modeling journal December 2008
Kinetics of elementary reactions in low-temperature autoignition chemistry journal August 2011
Interpreting chemical kinetics from complex reaction–advection–diffusion systems: Modeling of flow reactors and related experiments journal October 2014
Recent advances in laser absorption and shock tube methods for studies of combustion chemistry journal October 2014
Knocking combustion in spark-ignition engines journal July 2017
Modeling and experimental investigation of methylcyclohexane ignition in a rapid compression machine journal January 2007
Kinetic modeling of gasoline surrogate components and mixtures under engine conditions journal January 2011
Theoretical investigation into the low-temperature oxidation of ethylbenzene journal January 2013
Mass spectrometric investigation of the low-temperature dimethyl ether oxidation in an atmospheric pressure laminar flow reactor journal January 2013
Chemical functional group descriptor for ignition propensity of large hydrocarbon liquid fuels journal January 2019
BioCompoundML: A General Biofuel Property Screening Tool for Biological Molecules Using Random Forest Classifiers journal September 2016
Kinetics of the Reaction of OH with Isoprene over a Wide Range of Temperature and Pressure Including Direct Observation of Equilibrium with the OH Adducts journal August 2018
Improved Chemical Prediction from Scarce Data Sets via Latent Space Enrichment journal April 2019
Accurate Thermochemistry with Small Data Sets: A Bond Additivity Correction and Transfer Learning Approach journal June 2019
Quantitative Measurements of HO 2 and Other Products of n -Butane Oxidation (H 2 O 2 , H 2 O, CH 2 O, and C 2 H 4 ) at Elevated Temperatures by Direct Coupling of a Jet-Stirred Reactor with Sampling Nozzle and Cavity Ring-Down Spectroscopy (cw-CRDS) journal November 2014
Detailed Chemical Kinetic Modeling of Cyclohexane Oxidation† journal May 2007
Reaction OH + OH Studied over the 298–834 K Temperature and 1 - 100 bar Pressure Ranges journal February 2012
VUV Photoionization Cross Sections of HO 2 , H 2 O 2 , and H 2 CO journal February 2015
Ethanol Oxidation: Kinetics of the α-Hydroxyethyl Radical + O 2 Reaction journal August 2009
Experimental and Modeling Study of Premixed Atmospheric-Pressure Dimethyl Ether−Air Flames journal September 2000
Direct In Situ Quantification of HO 2 from a Flow Reactor journal March 2013
Microbial engineering for the production of advanced biofuels journal August 2012
Direct measurement of ˙OH and HO 2 ˙ formation in ˙R + O 2 reactions of cyclohexane and tetrahydropyran journal January 2018
Elementary radical reactions and autoignition journal January 1995
An instrument to measure fast gas phase radical kinetics at high temperatures and pressures journal May 2016
Vacuum ultraviolet photoionization cross section of the hydroxyl radical journal May 2018
Message-passing neural networks for high-throughput polymer screening journal June 2019
Quantification of OH and HO2 radicals during the low-temperature oxidation of hydrocarbons by Fluorescence Assay by Gas Expansion technique journal November 2013
A flow reactor for the study of homogeneous gas-phase oxidation of hydrocarbons at pressures up to 20 atm (2 MPa) journal June 1992
A high-pressure plug flow reactor for combustion chemistry investigations journal September 2017
Atmospheric Field Measurements of the Hydroxyl Radical Using Laser-Induced Fluorescence Spectroscopy journal May 2006
An intercomparison of HO2 measurements by fluorescence assay by gas expansion and cavity ring-down spectroscopy within HIRAC (Highly Instrumented Reactor for Atmospheric Chemistry) journal January 2017