Fully premixed atmospheric burners exhibit lower CO and NO_x emissions compared to partially premixed atmospheric burners. However, fully premixed burners show a higher tendency towards flame instabilities, i.e. flash-back, blow-off and acoustical problems. These instabilities limit the application range of this burner type, thus decreasing its potentials on the gas appliances market. In the case of multiport burners the operational range of a burner and its emission characteristics depend on flow-, and consequently on flame distribution over the burner ports. In order to optimize the operation of a fully premixed, multiport atmospheric burner, the influence of the burner mantel length on the flow distribution over the burner surface pattern was numerically investigated. The influence of the elongation of the burner mantel on the flame distribution and the entrainment of primary air were further tested experimentally.
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