Behavior of Obstructed Square Buoyant Vertical Jets in Static Ambient(Ⅰ)——Verification of Mathematical Model and Numerical Method
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摘要: 对静水中正方形孔口之上放置一正方形阻力盘的浮射流进行了试验，测量了不同工况下盘后自相似区域轴线上浓度的分布，并建立了其相应的三维数学模型，对不同工况进行了数值模拟计算，数值模拟结果与试验结果吻合较好．将结果与静水中圆孔有阻力浮射流的经验公式进行了比较，发现正方形孔口上放置一正方形阻力盘与圆孔上放置一圆盘在盘后自相似区轴线上浓度分布规律基本一致．对盘后不同高度位置处横截面上的温度等值线分布进行了分析，发现离正方形盘较近的一段高度内温度等值线呈现独特的星形分布，随着离盘距离的增加则变为与圆孔浮射流类似的同心圆形状．Abstract: Some experiments were made for the buoyant jet from a square orifice with a square disc placed on it in static ambient and concentration along the axis in self-similar area behind disc was measured. And at the same time a three-dimensional mathematical model was established to simulate the whole flowing under different conditions. All the results predicted by the numerical calculation are substantiated by the experiments. The results were compared with experiential formula for obstructed round buoyant vertical jets in static ambient and it was found that the two concentration distributions had good accordance. Star shape of temperature isolines on cross sections in the near areas from the disc was found and it was a very special figure for obstructed square buoyant vertical jets with a square disc. The shape will transform to concentric circles gradually alike to the round buoyant vertical jet in self-similar area with increasing of the distance from the disc.
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Key words:
- buoyant jets /
- square orifice /
- obstructed jet /
- three-dimensional model /
- dilution
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