多层多股水平淹没射流的消能研究

Study on the energy dissipation mechanism of multi-horizontal submerged jets

采用三维数值模拟,研究了多股多层水平淹没射流的流动特性、漩涡结构和消能机理。利用水工模型试验,研究了影响其水力特性的主要因素。研究结果表明:多股多层淹没射流利用在射流轴线周围所形成的强剪切、三维立体漩滚的剧烈混掺来实现消能,消能率较高,且在平面上没有形成明显的、贯穿的立轴漩涡。结合模型实验,提出中孔泄槽以等宽或微收缩为宜、表中孔最优坎高差应大于中孔水流的主流水深等建议。

The flow characteristics, eddy structure and energy dissipated mechanism of multi-horizontal submerged jets（MHSJ） are studied by means of 3-D numerical simulation. The main factors which affect the hydraulic characteristics of MHSJ are studied by the model test. The results show that an eddy surrounding the main stream of the multiple jets exists and forms several strong shear flows and enhances the effect of energy dissipation. Connecting to the results of the model test, some suggestions are put forward, such as the chute width of intermediate outlet should be constant, the optimum height difference of drop between intermediate outlet and surface outlet should be larger than the water depth at intermediate outlet.