Xuanya L, Shouxiang L, Quansheng K, Yingchun Z (2007) 'Characteristic of premixed methane flame inerting and extinction by coflow water mist.' (Science Press Beijing: Beijing) 1741-1746

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Keywords:

premixed flame, inerting, coflow water mist, extinction,

Abstract: Under the influence of water mist, gas flame can be inhibited or be accelerated on the different water mist conditions. In order to discuss the characteristic of premixed flame inerting and extinction by coflow water mist in more details, high speed schlieren photography and CCD camera were employed to study methane/air premixed flames affected by different water mist conditions in a coflow water mist tubular burner. Through the analysis of the influence of water mist on the flame stability and flame stretch, the process and mechanism of methane/air premixed flame inhibition with the tube burner were acquired, and then the mechanism of the premixed gases inerting by water mist was proposed. The results show that the stretch and curvature of the methane premixed flame are more obvious on insufficient water mists loading rate conditions, and the flames tend to be accelerated and generate back fire into the tube. For the same concentration premixed flames, with the water mist loading rate increasing, the flame stretch rate become smaller and the effect of flame extinguishment turn to more obvious. The results from this study demonstrate that the factors of water mist's effect on premixed flames consist of premixed gases concentration, gas flow velocity and the water mists loading rate, as increasing the methane concentration and flow velocity results in enhanced water mist flux to inert and extinguish the flames.