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An experimental study has been conducted to scrutinize into the influence of ultrasonic standing wave on the propagating behavior and structural stabilization o f propane/air premixed flame at various equivalence ratios in half-open rectangular duct. Evolu tionary features of the flame fronts are caught by high-speed images, and the variation of flame structure and local flame velocities along the propagation are analyzed. It is revealed that the propagation v elocity agitated by the ultrasonic standing wave is greater than that without the agitation: the velocity enhancement diminishes as the equivalence ratio approaches the stoichiometric. Influence of s tanding wave on the flame overwhelms that of the buoyancy which slants the flame front towards top o f the duct, and thus the standing wave contributes to the structural stabilization of propane/air premixed flame.        /         .     ,           .     ,        .               .Key Words: Premixed Flame(), Propane/Air(/), Ultrasonic Standing-wave(), Flame Propagation( ), Flame Stabilization( )

Interacting Effects of an Ultrasonic Standing-wave on the Propagation Behavior and Structural Stabilization of Propane/Air Premixed Flame