潜水轴流泵结构动应力分析

采用CFX 和Workbench软件在多工况下对潜水轴流泵的转子部件进行耦合计算,分析了转子部件在流体作用力、离心力以及重力作用下的应力、应变的分布规律,指出转子部件由于变形过大以及强度不足而引发失效事故的可能性.结果表明:轮毂受到的轴向力方向与叶轮受到的轴向力相反,且其受到的轴向力随着流量的增大而增大,在大流量情况下,轮毂可起到平衡轴向力的作用.从径向、轴向和周向变形可以看出,径向变形极小,周向变形最大,是叶轮的主变形,说明了扭矩在整个变形中占据了主要作用.叶片背面的压力值明显低于工作面,在叶片工作面靠近进口侧轮毂处附近区域出现较高应力区,会产生应力集中现象,且随着流量的增大,主应力减小.对水泵进行静力结构分析、强度校核,不仅可以降低事故的发生率,而且可以为轴流泵的水力优化设计提供有力的参考.

Structural dynamic stress analysis of submersible axial pump

The rotor component of submersible axial flow pump was calculated under multiple conditions using CFX and Workbench software to analyze the stress and strain distribution by the action of fluid force,centrifugal force and gravity. Moreover, the possibility of failure caused by large deformation and insufficient strength was pointed out. The results showed that the radial force was the minimum under the standard condition. The direction of axial force in the hub was opposite to that in the impeller. The axial force was increased with the flow rate increasing. The hub could balance the axial force well under the large flow condition. The radial deformation was extremely smaller than the circumferential deformation which was the main deformation in the impeller. This may mean that the torque plays a major role in the total deformation. The pressure on the suction surface was significantly lower than that on the pressure surface.Near the inlet side of the hub appeared the high stress area,in which would emerge stress concentration. The main stress was reduced with the flow increasing. The static structural analysis and strength assessment of the axial pump could not only reduce the incidence of accidents, but also provide a powerful reference for axial flow hydraulic design optimization.