Effect Of Co2 Addition On Syngas Ignition Delay Times In A Shock Tube

In this study, syngas ignition studies were conducted in a shock tube with high CO2 dilution. Syngas mixtures tested in were diluted with CO2 fractions ranging from 60%- 85% by volume. Evaluation of changing the equivalence ratios (ϕ), between 0.33, 0.5, and 1.0 as well as changing the fuel ratio (θ), hydrogen to carbon monoxide ratio, from 0.25, 1.0 and 4.0 were carried out at fixed 10% fuel. High-speed imaging from the end wall was recorded with a Phantom V710 camera operating at 67,065 frames per second. The study was performed at 1.61-1.77 atm and a temperature range of 1006-1162K. The trends of changing both ϕ and θ were as expected from literature on similar mixtures. 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 two combustion chemical kinetic mechanisms: GRI v3.0 and AramcoMech v2.0