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- KurzbeschreibungImpinging flame jets have been widely studied <br>because of their importance in a range of <br>applications such as materials processing and fire <br>safety. The purpose here was to determine the <br>importance of radiation, convection, and <br>thermochemical heat release (TCHR) under a range of <br>conditions. Natural gas was premixed with oxidants <br>ranging from air to pure oxygen in a round burner <br>that produced uniform exit conditions. Flames <br>impinged perpendicular to a water-cooled flat disk <br>segmented into 6 concentric calorimeteric sections <br>to measure radial heat flux distribution. <br>Many parameters were varied such as firing rate, <br>burner-to-disk spacing, oxidant composition and <br>disk surface treatment. Untreated, polished, <br>blackened, alumina-coated and platinum-coated disk <br>surfaces made of stainless steel, copper or brass <br>were tested. High (blackened) vs. low (polished) <br>emissivity surfaces showed nonluminous gaseous <br>radiation was less than 10% of the total heat flux. <br>Noncatalytic (alumina) vs. catalytic (platimum) <br>surfaces showed that TCHR was only important for <br>high O2 oxidants. The radial location of the highest <br>heat flux depended on oxidant composition.
- AutorCharles E. Baukal
- Seiten172 Seiten
- Gewicht275 g
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