Behavior of Obstructed Square Buoyant Vertical Jets in Static Ambient(Ⅱ)——Analysis on the Behavior of Flow Field
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摘要: 在数值计算成果的基础上，对正方形阻力盘浮力射流的流场进行了分析和总结，基于轴线流速的变化规律将盘后流场分为3个区域：回流区、过渡区和自相似区．验证了竖直方向流速自相似性的存在．根据给出的轴线流速的变化图也可以区分盘后3个区域的位置，同时发现各工况在自相似区域的轴线流速沿同一规律曲线变化，采用Chen和Rodi对流速的表示方法，得到了所有工况下自相似区域轴线流速的分布公式．给出了典型工况下阻力盘后不同高度位置处的压强场等值线变化过程，发现盘后各负压中心区域的产生、膨胀、破裂和消失．Abstract: Based on a series of numerical calculations, the behavior of flow field in obstructed square buoyant vertical jet is summarized and analyzed. Based on the axial line velocity distribution, the flow after the disc can be divided into three regions: i.e. recirculation region, transitional region and selfsimilar region. The characteristic of self-similarity of upright velocity was validated. The three regions can also be distinguished based on the axial velocity. The axial velocity in self-similar region was found to obey the same law and the formula was presented by introducing the velocity expression used by Chen and Rodi. The isolines of pressure on cross sections of different heights were displayed and the production, expansion, breaking and disappearing of negative pressure regions were found.
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Key words:
- buoyant jets /
- divided regions /
- velocity field /
- pressure field /
- axial velocity
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