不同型式隔舌离心泵动静干涉作用的数值模拟

Numerical simulation for rotor-stator interaction of centrifugal pump with different tongues

为了研究不同型式隔舌对离心泵动静干涉作用的影响,分别对长舌、中舌和短舌3种不同型式隔舌的离心泵采用大涡模拟动态亚格子湍流模型进行三维非稳态数值模拟,通过非定常数值计算获得了不同型式隔舌离心泵隔舌处压力脉动特性和作用在叶轮和蜗壳上的径向力特性,并对其进行比较分析。结果表明:由于受到动静干涉的影响,不同工况下作用在叶轮上的径向力矢量图呈明显的六角星分布;各工况下作用在蜗壳上的径向力矢量图基本呈椭圆形分布;采用短舌的离心泵扬程增高,高效区增宽;作用在叶轮和蜗壳上的径向力大小和方向时刻都在变化;采用中舌和短舌时,隔舌处的脉动幅值和作用在叶轮上的径向力均减小,说明采用中舌和短舌可以改善了隔舌处压力脉动和作用在叶轮上的径向力。

In order to study rotor-stator interaction with different tongues of the centrifugal pump,the three-dimensional unsteady flow in the centrifugal pump with long-tongue,middle-tongue and short-tongue respectively,was simulated numerically using the dynamical subgrid-scale models.Variable characters of pressure fluctuation and radial hydraulic force on the impeller and volute with different tongues were achieved with a comparison was done.The results indicate that：as a result of the rotor-stator interaction,the distributions of the radial hydraulic force on the impeller vector coordinates have a obvious character of hexagonal star with different tongues under different running conditions and the distributions of the radial hydraulic force on the volute vector coordinates are presented ellipse using different tongues under different running conditions;the head increases and high efficiency area of the pump broaden using short-tongue;the radial hydraulic force on the impeller and volute changes with time;the pressure fluctuations near tongue and the radial hydraulic forces on the impeller of pumps decrease using middle-tongue and short-tongue.