Explosion regions of 1,3-dioxolane/nitrous oxide and 1,3-dioxolane/air with different inert gases- Experimental data and numerical modelling

摘要

In this study, experimental determination and modelling investigations for the explosion regions of 1,3-dioxolane/inert gas/N2O and 1,3-dioxolane/inert gas/air mixtures were carried out and compared. The experimental measurements were carried out at 338 & nbsp;K and atmospheric pressure according to EN1839 method T using the inert gases N-2, CO2, He and Ar. The results showed that the ratio of the lower explosion limit in N2O (LELN2O) to the lower explosion limit in air (LELair) is 0.52 and the ratio of the maximum oxygen content in air (MOCair) to the limiting & nbsp;oxidizer & nbsp;fraction in nitrous oxide (LOFN2O) is 0.36 & nbsp;+/-& nbsp;0.02 independent of the inert gas. When comparing the inert gas amount at the apex based on the pure oxidizing component, which is O-2 & nbsp;in case of air, N2O-containing mixtures need less inert gas to reach the limiting oxidizer quantity whereas the efficiency of inert gases is in the same order. The coefficients of nitrogen equivalency however were found to differ to some extent. The explosion regions of 1,3-dioxolane/inert gas/oxidizer mixtures were modelled using the calculated & nbsp;adiabatic flame temperature & nbsp;profile (CAFTP) method as well as corrected adiabatic flame temperatures. The results indicate good agreement with experimental data for CO2, N-2 & nbsp;and Ar- containing mixtures. The noticeable deviations that occur when He is the inert gas are due to the lacking transport data of that mixture.