基于单相流模型的水下多孔板减流特性影响因素数值仿真研究

Numerical Simulation Research on Influencing Factors of Underwater Multi-orifice Plate Flow Reduction Characteristics Based on Single-phase Flow Model

在内河航道整治、沉船打捞,以及水下检测过程中往往需要减小工作水域的流速以保证施工质量的问题,提出在浮式防波堤底部安装多孔板进行减流的工程方案.并基于单项流模型,对水下多孔板的开孔率、开孔形式,以及开孔数量对其减流特性的影响进行了仿真分析.结果表明:圆形与正方形的开孔形式较正五边形与正四边形的开孔形式减流效果要好、在条件允许的情况下,增加多孔板的开孔数量也可以改善多孔板的后方流场.多孔板的开孔率对其减流效果的影响最大.且开孔率在0.5时流场减流效果最好.

In view of the fact that the research and development of current reduction equipment in China is still blank, but it is often necessary to reduce the velocity of working waters to ensure the construction quality in the process of inland waterway regulation, sunken ship salvage and underwater detection, an engineering scheme of installing perforated plates at the bottom of floating breakwater for current reduction was proposed. Based on the single flow model, the effects of the opening rate, opening form and opening number of underwater perforated plate on its flow reduction characteristics were simulated and analyzed. The results show that circular and square openings have better flow reduction effect than regular pentagons and regular quadrangles. If conditions permit, increasing the number of openings in the perforated plate can also improve the flow field behind the perforated plate. The opening ratio of porous plate has the greatest influence on its flow reduction effect, and the flow field flow reduction effect is the best when the opening ratio is 0.5.