An apparatus was develoed for testing the extinction efficiency of a solid powder in a coflowing non-premixed flame.Extinction measuremnts were perfromed by adding agent quasistatically to the oxidizer stream until flame extinction was observed.The concentration of powder agent was monitored by laser transmission.Extinctin measruements were performed on flames burnign both liquids and gases using sodium bicarbonate (NaHCO_3) powder as the extinguishing agent.
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