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为研究“Y型”汇流口处螺旋流结构,通过三维数值模拟分析了汇流比(干流流量与汇流口处总流量之比)对“Y型”汇流口处螺旋流结构的影响.分析认为,当干支流流量相差悬殊时,流量占绝对优势一侧的水流会在汇流口处形成一大螺旋流,另一侧螺旋流将受到压迫,在汇流口处表现为单一的大螺旋流结构;当干支流流量相当时,汇流口处水流表现为表面汇聚的双螺旋流结构,并由此提出“Y型”汇流口处三维概化模型.
In order to study the spiral flow structure at “Y” type junction, the effect of confluence ratio (ratio of main flow to total flow at junction) on the spiral flow structure at “Y ” junction was analyzed by three dimensional numerical simulation The analysis shows that when there is a great difference between the main and the tributary flow, the water flow with the absolute dominant flow will form a large spiral flow at the junction and the other spiral will be compressed, presenting as a single large spiral at the junction Flow structure. When the flow of dry and tributaries is equivalent, the water flow at the junction presents as a double helical flow structure converging on the surface, and the three-dimensional generalized model of “Y-type” junction is proposed.