skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: High pressure shock tube ignition delay time measurements during oxy-methane combustion with high levels of CO 2 dilution

Abstract

For this study, ignition delay times and methane species time-histories were measured for methane/O 2 mixtures in a high CO 2 diluted environment using shock tube and laser absorption spectroscopy. The experiments were performed between 1300 K and 2000 K at pressures between 6 and 31 atm. The test mixtures were at an equivalence ratio of 1 with CH 4 mole fractions ranging from 3.5% -5% and up to 85% CO 2 with a bath of argon gas as necessary. The ignition delay times and methane time histories were measured using pressure, emission, and laser diagnostics. Predictive ability of two literature kinetic mechanisms (GRI 3.0 and ARAMCO Mech 1.3) was tested against current data. In general, both mechanisms performed reasonably well against measured ignition delay time data. The methane time-histories showed good agreement with the mechanisms for most of the conditions measured. A correlation for ignition delay time was created taking into the different parameters showing that the ignition activation energy for the fuel to be 49.64 kcal/mol. Through a sensitivity analysis, CO 2 is shown to slow the overall reaction rate and increase the ignition delay time. To the best of our knowledge, we present the first shock tubemore » data during ignition of methane/CO 2/O 2 under these conditions. In conclusion, current data provides crucial validation data needed for development of future kinetic mechanisms.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Univ. of Central Florida, Orlando, FL (United States)
Publication Date:
Research Org.:
Univ. of Central Florida, Orlando, FL (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1347214
Alternate Identifier(s):
OSTI ID: 1353406
Grant/Contract Number:
FE0025260
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Energy Resources Technology
Additional Journal Information:
Journal Volume: 139; Journal Issue: 4; Journal ID: ISSN 0195-0738
Publisher:
ASME
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; combustion; carbon dioxide; methane; shock tubes; ignition delay; ignition; lasers; fuels; absorption spectroscopy; sensitivity analysis

Citation Formats

Pryor, Owen, Barak, Samuel, Lopez, Joseph, Ninnemann, Erik, Koroglu, Batikan, Nash, Leigh, and Vasu, Subith. High pressure shock tube ignition delay time measurements during oxy-methane combustion with high levels of CO2 dilution. United States: N. p., 2017. Web. doi:10.1115/1.4036254.
Pryor, Owen, Barak, Samuel, Lopez, Joseph, Ninnemann, Erik, Koroglu, Batikan, Nash, Leigh, & Vasu, Subith. High pressure shock tube ignition delay time measurements during oxy-methane combustion with high levels of CO2 dilution. United States. doi:10.1115/1.4036254.
Pryor, Owen, Barak, Samuel, Lopez, Joseph, Ninnemann, Erik, Koroglu, Batikan, Nash, Leigh, and Vasu, Subith. Thu . "High pressure shock tube ignition delay time measurements during oxy-methane combustion with high levels of CO2 dilution". United States. doi:10.1115/1.4036254. https://www.osti.gov/servlets/purl/1347214.
@article{osti_1347214,
title = {High pressure shock tube ignition delay time measurements during oxy-methane combustion with high levels of CO2 dilution},
author = {Pryor, Owen and Barak, Samuel and Lopez, Joseph and Ninnemann, Erik and Koroglu, Batikan and Nash, Leigh and Vasu, Subith},
abstractNote = {For this study, ignition delay times and methane species time-histories were measured for methane/O2 mixtures in a high CO2 diluted environment using shock tube and laser absorption spectroscopy. The experiments were performed between 1300 K and 2000 K at pressures between 6 and 31 atm. The test mixtures were at an equivalence ratio of 1 with CH4 mole fractions ranging from 3.5% -5% and up to 85% CO2 with a bath of argon gas as necessary. The ignition delay times and methane time histories were measured using pressure, emission, and laser diagnostics. Predictive ability of two literature kinetic mechanisms (GRI 3.0 and ARAMCO Mech 1.3) was tested against current data. In general, both mechanisms performed reasonably well against measured ignition delay time data. The methane time-histories showed good agreement with the mechanisms for most of the conditions measured. A correlation for ignition delay time was created taking into the different parameters showing that the ignition activation energy for the fuel to be 49.64 kcal/mol. Through a sensitivity analysis, CO2 is shown to slow the overall reaction rate and increase the ignition delay time. To the best of our knowledge, we present the first shock tube data during ignition of methane/CO2/O2 under these conditions. In conclusion, current data provides crucial validation data needed for development of future kinetic mechanisms.},
doi = {10.1115/1.4036254},
journal = {Journal of Energy Resources Technology},
number = 4,
volume = 139,
place = {United States},
year = {Thu Mar 30 00:00:00 EDT 2017},
month = {Thu Mar 30 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 1work
Citation information provided by
Web of Science

Save / Share:
  • Ignition delay times and methane species time-histories were measured for methane/O2 mixtures in a high CO2 diluted environment using shock tube and laser absorption spectroscopy. The experiments were performed between 1300 K and 2000 K at pressures between 6 and 31 atm. The test mixtures were at an equivalence ratio of 1 with CH4 mole fractions ranging from 3.5% -5% and up to 85% CO2 with a bath of argon gas as necessary. The ignition delay times and methane time histories were measured using pressure, emission, and laser diagnostics. Predictive ability of two literature kinetic mechanisms (GRI 3.0 and ARAMCOmore » Mech 1.3) was tested against current data. In general, both mechanisms performed reasonably well against measured ignition delay time data. The methane time-histories showed good agreement with the mechanisms for most of the conditions measured. A correlation for ignition delay time was created taking into the different parameters showing that the ignition activation energy for the fuel to be 49.64 kcal/mol. Through a sensitivity analysis, CO2 is shown to slow the overall reaction rate and increase the ignition delay time. To the best of our knowledge, we present the first shock tube data during ignition of methane/CO2/O2 under these conditions. Current data provides crucial validation data needed for development of future kinetic mechanisms.« less
  • Cited by 1
  • Ignition delay times have been measured in homogeneous CH/sub 4/-O/sub 2/ and CH/sub 4/-O/sub 2/-N/sub 2/ mixtures dilute in argon, in order to investigate the influence of molecular nitrogen. The mixtures were heated behind reflected waves in a conventional shock tube to temperatures between 1640 and 2150/sup 0/K at pressures from 1 to 6 atm. Equivalence ratios of 1.0 and 2.0 were investigated and the methane concentration ranged from 1 x 10/sup -7/ to 9 x 10/sup -7/ mole/cc. Ignition was identified from photometric observations of OH (3064 A), H/sub 2/O (2.7 ..mu..) and CO/sub 2/(4.3 ..mu..) emission. For bothmore » the CH/sub 4/-O/sub 2/ and CH/sub 4/-O/sub 2/-N/sub 2/ mixtures, the measured ignition delays (tau/sub i/) were correlated by the empirical expression tau/sub i/ = 4.4 x 10/sup -15/ exp (52,300/RT)(CH/sub 4/)/sup 0/./sup 33/(O/sub 2/)/sup -1/./sup 03/, in mole, cal, cm and sec units. It was concluded that molecular nitrogen has little or no influence upon the ignition delay times of methane-oxygen mixtures. This conclusion is supported by several earlier investigations of methane ignition but conflicts with the recent study by Zallen and Wittig.« less
  • Common definitions for ignition delay time are often hard to determine due to the issue of bifurcation and other non-idealities that result from high levels of CO 2 addition. Using high-speed camera imagery in comparison with more standard methods (e.g., pressure, emission, and laser absorption spectroscopy) to measure the ignition delay time, the effect of bifurcation has been examined in this study. Experiments were performed at pressures between 0.6 and 1.2 atm for temperatures between 1650 and 2040 K. The equivalence ratio for all experiments was kept at a constant value of 1 with methane as the fuel. The COmore » 2 mole fraction was varied between a value of X CO2 = 0.00 to 0.895. The ignition delay time was determined from three different measurements at the sidewall: broadband chemiluminescent emission captured via a photodetector, CH 4 concentrations determined using a distributed feedback interband cascade laser centered at 3403.4 nm, and pressure recorded via a dynamic Kistler type transducer. All methods for the ignition delay time were compared to high-speed camera images taken of the axial cross-section during combustion. Methane time-histories and the methane decay times were also measured using the laser. It was determined that the flame could be correlated to the ignition delay time measured at the side wall but that the flame as captured by the camera was not homogeneous as assumed in typical shock tube experiments. The bifurcation of the shock wave resulted in smaller flames with large boundary layers and that the flame could be as small as 30% of the cross-sectional area of the shock tube at the highest levels of CO 2 dilution. Here, comparisons between the camera images and the different ignition delay time methods show that care must be taken in interpreting traditional ignition delay data for experiments with large bifurcation effects as different methods in measuring the ignition delay time could result in different interpretations of kinetic mechanisms and impede the development of future mechanisms.« less