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Research Papers: Research Papers

High-Pressure Oxy-Syngas Ignition Delay Times With CO2 Dilution: Shock Tube Measurements and Comparison of the Performance of Kinetic Mechanisms

[+] Author and Article Information
Samuel Barak, Erik Ninnemann, Sneha Neupane, Frank Barnes, Jayanta Kapat

Center for Advanced Turbomachinery and
Energy Research (CATER),
Mechanical and Aerospace Engineering,
University of Central Florida,
Orlando, FL 32816

Subith Vasu

Center for Advanced Turbomachinery and
Energy Research (CATER),
Mechanical and Aerospace Engineering,
University of Central Florida,
Orlando, FL 32816
e-mail: subith@ucf.edu

Manuscript received July 3, 2018; final manuscript received July 8, 2018; published online September 26, 2018. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 141(2), 021011 (Sep 26, 2018) (7 pages) Paper No: GTP-18-1438; doi: 10.1115/1.4040904 History: Received July 03, 2018; Revised July 08, 2018

In this study, syngas combustion was investigated behind reflected shock waves in CO2 bath gas to measure ignition delay times (IDT) and to probe the effects of CO2 dilution. New syngas data were taken between pressures of 34.58–45.50 atm and temperatures of 1113–1275 K. This study provides experimental data for syngas combustion in CO2 diluted environments: ignition studies in a shock tube (59 data points in 10 datasets). In total, these mixtures covered a range of temperatures T, pressures P, equivalence ratios φ, H2/CO ratio θ, and CO2 diluent concentrations. Multiple syngas combustion mechanisms exist in the literature for modeling IDTs and their performance can be assessed against data collected here. In total, twelve mechanisms were tested and presented in this work. All mechanisms need improvements at higher pressures for accurately predicting the measured IDTs. At lower pressures, some of the models agreed relatively well with the data. Some mechanisms predicted IDTs which were two orders of magnitudes different from the measurements. This suggests that there is behavior that has not been fully understood on the kinetic models and is inaccurate in predicting CO2 diluted environments for syngas combustion. To the best of our knowledge, current data are the first syngas IDTs measurements close to 50 atm under highly CO2 diluted (85% per vol.) conditions.

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Figures

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Fig. 1

Pressure and emissions traces for a typical experiment near 40 atm. The pressure traces for two kinetic mechanism model assumptions are also shown. The unsteadiness in the test pressure is due to bifurcation effects where pressure is measured.

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Fig. 8

Measured and predicted ignition delay times for mixture 1 from Table 1

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Fig. 2

Measured [13] and predicted ignition delay times for mixture 1 from Table 3

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Fig. 3

Measured [13] and predicted ignition delay times for mixture 2 from Table 3

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Fig. 4

Measured [13] and predicted ignition delay times for mixture 3 from Table 3

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Fig. 5

Measured [13] and predicted ignition delay times for mixture 4 from Table 3

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Fig. 6

Measured [13] and predicted ignition delay times for mixture 5 from Table 3

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Fig. 7

Measured [13] and predicted ignition delay times for mixture 6 from Table 3

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Fig. 9

Measured and predicted ignition delay times for mixture 2 from Table 1

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Fig. 10

Measured and predicted ignition delay times for mixture 3 from Table 1

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Fig. 11

Measured and predicted ignition delay times for mixture 4 from Table 1

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Fig. 12

Pressure dependence of syngas ignition delay times along with predictions of three mechanisms. High-pressure data from current work; Low pressure data from Ref. [13].

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Fig. 13

Sensitivity coefficients (Li-2007 mechanism) for ignition delay time on OH time-history obtained through a brute force sensitivity analysis. Top 10 reactions are shown.

Tables

Errata

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