Burning Velocities of Butadiene−1,3 with Nitrogen-Oxygen and Helium-Oxygen Mixtures

Abstract

Burning velocities of nitrogen‐oxygen‐butadiene−1,3 and helium‐oxygen‐butadiene−1,3 have been measured at atmospheric and reduced pressures. At atmospheric pressure the ratio of 3.7:1 for the maximum burning velocities was obtained for helium compared to nitrogen as the inert gas. Reduction of pressure caused an increase then a decrease in burning velocity for helium‐oxygen‐butadiene−1,3. The maximum value of the burning velocity occurred at 300 mm pressure. Calculations of the equilibrium concentrations of H, O, and OH for the gas mixtures used have been made. Assuming that the controlling factor in the burning velocity is the back‐diffusion of H‐atoms, good agreement between calculated and experimental burning velocity ratios is obtained.