Measurements and interpretation of shock tube ignition delay times in highly CO2 diluted mixtures using multiple diagnostics

Pryor, Owen; Barak, Samuel; Koroglu, Batikan; Ninnemann, Erik; Vasu, Subith S.

doi:10.1016/j.combustflame.2017.02.020

Title: Measurements and interpretation of shock tube ignition delay times in highly CO₂ diluted mixtures using multiple diagnostics

Journal Article · Sun Mar 12 00:00:00 EST 2017 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2017.02.020· OSTI ID:1353154

Pryor, Owen ^[1]; Barak, Samuel ^[1]; Koroglu, Batikan ^[2]; Ninnemann, Erik ^[1];

^[1]

Univ. of Central Florida, Orlando, FL (United States)
Univ. of Central Florida, Orlando, FL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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 CO₂ 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 CO₂ 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, CH₄ 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 CO₂ 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.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Central Florida, Orlando, FL (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: AC52-07NA27344; FE0025260

OSTI ID:: 1353154

Alternate ID(s):: OSTI ID: 1343790; OSTI ID: 1419137

Report Number(s):: LLNL-JRNL-707839

Journal Information:: Combustion and Flame, Vol. 180, Issue C; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 69 works

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Title: Measurements and interpretation of shock tube ignition delay times in highly CO2 diluted mixtures using multiple diagnostics

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Title: Measurements and interpretation of shock tube ignition delay times in highly CO₂ diluted mixtures using multiple diagnostics