论文部分内容阅读
盆池涡是在盆池排水时在盆池中央的排水管道入口处形成的漏斗状旋涡。文中采用标准k-ε湍流模型和VOF方法对盆池涡的涡动全过程进行了仿真模拟,然后对计算结果进行分析和归纳,提出了盆池涡涡动机理假说。盆池涡是由外来扰动或流道截面几何形状的不规则或表面粗糙度不均匀引起速度场一定的切向流动而诱发出来的旋涡,其旋转方向是随机的,但与形成的切向流动方向一致。盆池涡是一种类兰金涡,速度和压力的分布具有兰金组合涡的特点;盆池涡在成熟阶段具有三个特性区域,分别称为抽气孔、吸气孔、抬气区域。
The basin vortex is a funnel-shaped vortex formed at the drainage pipe entrance at the center of the basin when the basin is drained. In this paper, the standard k-ε turbulence model and the VOF method are used to simulate the whole process of the vortex of basin vortices. Then the calculation results are analyzed and summarized, and the hypothesis of basin vortex motions is proposed. The basin pool vortex is a vortex induced by a certain tangential flow velocity field due to external disturbances or irregular geometric shapes of the cross-section of the flow channel or unevenness of the surface roughness. The swirling directions of the basin vortices are random but different from the tangential flow The same direction. The basin pool vortex is a type of Rankine vortex, the distribution of velocity and pressure has the characteristics of Rankine combined vortex. The basin pool vortex has three characteristic regions at maturity stage, which are respectively called as the suction hole, suction hole and lift zone.