Quenching Distance of Premixed Propane/Air Mixture Flowing Comparatively Slow Velocity

<p>The quenching distance of premixed propane/air mixture flowing comparatively slow velocity was experimentally investigated to contribute the accurate evaluation for physical hazard of flammable gases. The quenching distance decreased with increasing flow velocity with in the present range of flow velocity. It was because the heat loss of flame core decreased as the residential duration of flame core within the gap of electrode flat plate was shortened by forced flow. When the quenching distance in the presence of forced flow was normalized by which in the absence of forced flow, it could be arranged well by the normalized flame propagation rate which was the ratio of the dimensional flame propagation rate in the presence of forced flow to that in the absence of forced flow regardless of the flow velocity. The laminar burning velocity which was required to estimate the normalized flame propagation rate as mentioned above could be estimated by Cantera with USC-Mech reaction mechanism model. As these results, the quenching distance of flowing propane/air mixture with comparatively slow velocity is resulted to be underestimate evaluation from the quenching distance in the absence of forced flow. However, if the relationship between the quenching distance and the flame propagation rate in the absence of forced flow can be estimated well, that in the presence of forced flow can also be estimated well by the above relationship between normalized quenching distance and normalized flame propagation rate. It is the greatest finding obtained in the present work.</p>