A Shock-Tube Study Of The Ignition And Oxidation Characteristics Of Syngas At Elevated Pressures

Ignition and oxidation characteristics of CO/H2 fuel blends were studied using both experimental and computer simulation methods. Shock-tube experiments were conducted behind reflected shock waves at intermediate temperatures (925 K \u3c T \u3c 1300 K) for two average pressure regimes, 2.4 atm and 14.9 atm. Emission in the form of chemiluminescence from the hydroxyl radical (OH∗) A2∑+ → X2 transition near 307 nm was used to monitor reaction progress from which ignition delay times were determined. In addition to the experimental analysis, chemical kinetics modeling was completed to compare existing chemical kinetics mechanisms to the new experimental results. In the lower pressure regime, the models were in good agreement with the shock-tube data at higher temperatures, however, as the H2 second explosion limit was approached, there was a great tendency for the models to over predict the experimental data. At the highest pressures, the models were in good agreement with the experimental data for the entire temperature range that was explored