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research-article

HIGH-SPEED IMAGING AND MEASUREMENTS OF IGNITION DELAY TIMES IN OXY-SYNGAS MIXTURES WITH HIGH CO2 DILUTION IN A SHOCK TUBE WITH HIGH-SPEED IMAGING

[+] Author and Article Information
Samuel Barak, Erik Ninnemann

Center for Advanced Turbomachinery and Energy Research (CATER), University of Central Florida, Orlando, Florida, USA
sambarak@knights.ucf.edu

Owen Pryor, Joseph Lopez

Center for Advanced Turbomachinery and Energy Research (CATER), University of Central Florida, Orlando, Florida, USA
sambarak@Knights.ucf.edu

Subith Vasu

Center for Advanced Turbomachinery and Energy Research (CATER), University of Central Florida, Orlando, Florida, USA
subithvasu@ucf.edu

Batikan Koroglu

Lawrence Livermore National Lab, Livermore, CA, USA
koroglu1@llnl.gov

1Corresponding author.

ASME doi:10.1115/1.4037458 History: Received June 09, 2017; Revised June 18, 2017

Abstract

In this study, syngas combustion was investigated behind reflected shock waves in order to gain insight into the behavior of ignition delay times and effects of the CO2 dilution. Pressure and light emissions time-histories measurements were taken at a 2cm axial location away from the end wall. Highspeed visualization of the experiments from the end wall was also conducted. Oxy-syngas mixtures that were tested in the shock tube were diluted with CO2 fractions ranging from 60% - 85% by volume. A 10% fuel concentration was consistently used throughout the experiments. This study looked at the effects of changing the equivalence ratios (?), between 0.33, 0.5, and 1.0 as well as changing the fuel ratio (?), hydrogen to carbon monoxide, from 0.25, 1.0 and 4.0. The study was performed at 1.61-1.77 atm and a temperature range of 1006- 1162K. The high-speed imaging was performed through a quartz end wall with a Phantom V710 camera operated at 67,065 frames per second. The high-speed imaging showed non-homogeneous combustion in the system, however, most of the light emissions were outside the visible light range where the camera is designed for. The results were compared to predictions of two combustion chemical kinetic mechanisms: GRI v3.0 and AramcoMech v2.0 mechanisms. In general, both mechanisms did not accurately predict the experimental data. The results showed that current models are inaccurate in predicting CO2 diluted environments for syngas combustion.

Copyright (c) 2017 by ASME
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