TED-AJ03-524 Effects of nozzle-to-plate distance on the convection of an impinging slot flame jet

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An experimental study was performed to investigate the effects of nozzle-to-plate distance with varying jet Reynolds number and equivalence ratio on the convective heat transfer characteristics of a premixed, butane/air impinging flame jet. Slot jet was selected because it is widely used in both industrial and domestic applications. According to our previous studies, slot flame jet is able to produce more uniform heat flux than the circular jet. The range of nozzle-to-plate distance in the present investigation was from H/d=1 to 16. the Reynolds numbers were selected to range from 1000 to 1700,such that the study was focusing on laminar flow. The air/fuel equivalence ratio was extended from 0.85 to 2.0 to cover fuel-lean to fuel-rich conditions. This study provided the flame shapes and the flame temperature distributions along the impingement plate, which were important indications of the convective heat transfer characteristics of the flame jet. Comparisons of the heat transfer characteristics between the width and length of the slot shape nozzle were made. The flame temperature was found to be directly dependent on the equivalence ratio of the air/fuel mixture, and to a lesser extent, on the jet Reynolds number. And the maximum flame temperature was found to occur at the stagnation point of the impingement plate when the nozzle-to-plate distance was set to equal to the length of the luminous zone.
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