Shock-Induced Ignition of Methane, Ethane, and Methane/Ethane Mixtures Sensitized by NO₂

Ignition delay times of stoichiometric CH4/NO2/O2/Ar, C2H6/NO2/O2/Ar, and CH4/C2H6/NO2/O2/Ar mixtures are measured with a shock tube to investigate the role of NO2 in ignition of methane, ethane, and natural gas (CH4/C2H6 = 9:1). All measurements are carried out at 1016–1981 K and 5–16 atm. Different NO2 concentrations (0, 25, 50, and 75% of fuel molar concentrations) are explored. The addition of NO2 promotes considerably the ignition of...