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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects of plate temperature on heat transfer and emissions of impinging flames
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Effects of plate temperature on heat transfer and emissions of impinging flames

机译：平板温度对传热和撞击火焰排放的影响

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Experiments were conducted to investigate the heat transfer and CO/NO_x emissions of a premixed LPG/ air circular flame jet impinging upwards normally to a flat rectangular plate. Temperatures of the impingement plate were controlled by cooling water at 38 ℃, 58 ℃ and 78 ℃ which was circulating at its back in order to create different plate temperatures. Under each plate temperature, the effects of Reynolds number (Re), equivalence ratio (φ) and nozzle-to-plate distance (H) on the heat transfer and CO/ NO_x emissions were examined. The Re was selected to be 500, 1000 and 1500 to ensure laminar flame jets. The values of φ were chosen to cover fuel-lean, stoichiometric and fuel-rich conditions. The H varied from 3d to 7d with an interval of 1d.rnThe flame-side temperature of the impingement plate is enhanced when the cooling water temperature increases, but the temperature difference across the impingement plate is reduced. Heat transfer from the flame to the plate is suppressed at higher cooling water temperature. The heat transfer rate is the highest when the cooling water temperature is at 38 ℃ and the lowest heat flux is obtained at 78 ℃. At the highest cooling water temperature of 78 ℃, the CO emission is reduced whereas the NO_x emission is enhanced. However, this trend is reversed at the lowest cooling water temperature of 38 ℃.
机译：进行实验以研究预混合液化石油气/空气圆形火焰射流的热传递和CO / NO_x排放，这些气体通常向上撞击扁平的矩形板。冲击板的温度通过冷却水在其后部循环的38℃，58℃和78℃进行控制，以产生不同的板温。在每个板温下，检查了雷诺数（Re），当量比（φ）和喷嘴到板的距离（H）对传热和CO / NO_x排放的影响。为了确保层流火焰喷射，Re被选择为500、1000和1500。选择φ的值以涵盖稀油，化学计量和富油条件。 H从3d到7d以1d的间隔变化。rn冷却水温度升高时，冲击板的火焰侧温度升高，但冲击板上的温差减小。在较高的冷却水温度下，抑制了从火焰到板的热传递。当冷却水温度为38℃时，传热率最高，而在78℃时，传热率最低。在最高冷却水温度为78℃时，CO排放减少，而NO_x排放增加。但是，这种趋势在最低冷却水温度为38℃时是相反的。

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