可燃性ガスの消炎距離の圧力および酸素濃度依存性

Abstract

Quenching distances have been measured for methane, ethane, propane, buta ne, ethylene oxide, and hydrogen, respectively, for different total pressures and oxygen concentrations (Fig.1). It has been found that the values of equivalence ratio φ, which correspond to the minimum quenching distances do not much change when the pressure and/or oxygen concentration are changed. The effects of pressure and oxygen concentration on the quenching distances of methane through butane are very similar. For ethylene oxide, the effect of oxygen concentration becomes relatively small. For hydrogen, this trend is more exaggerated than for ethylene oxide. The values of reaction order and activation energy have been estimated from the changes of the minimum quenching distances (Table 1). The values estimated here for methane and hydrogen are compared with those determined from the burning velocity in the literature (Tables 2 and 3). Agreement is not good between the values estimated from the quenching distances and those obtained from the burning velocities.