Abstract
Flow condition was simulated in a shaft tubular pump by using the Shear-Stress Transport (SST) k-ω turbulence model with high quality structured grids in design condition. Corresponding structural vibration characteristics were then analyzed based on two-way coupled Fluid-Structure Interaction (FSI) method. Fluid results showed that flow in the outlet flow passage was a combination of the axial flow and circumferential rotation motion. Time and frequency domain analysis of pressure pulsation of typical measure points indicated that larger pulsation amplitudes appeared in the tip of the blades and the main vibration source was the pressure pulsation induced by rotation of the blades. The fluid pulsation amplitudes decreased gradually along the flow direction, which can be ascribed to the function of fixed guide vane. Structural analysis of the blades in both pressure and suction side indicated that significant stress concentration was formed at the blade and hub connection near the leading edge. Maximum effective stress of the blades varied periodically, so prevention measures of the fatigue of blades should be taken. This research can provide important reference for the design of the tubular pump.
Highlights
Rapid development of the industry and agriculture puts great demand on the water conservancy facilities, which gives rise to more pumping stations
The numerical method was based on the Stress Transport (SST) k-ω turbulence model and the two-way coupled Fluid-Structure Interaction (FSI) approach under transient state
The following conclusions can be made by analysis of the results: (1) The flow pattern is steady in the inlet flow passage in design condition
Summary
Rapid development of the industry and agriculture puts great demand on the water conservancy facilities, which gives rise to more pumping stations. Because of its less hydraulic loss, high efficiency, and compact structure, convenient installation, and maintenance, tubular pump, a kind of axial flow pump, presents wide popularity and development potential worldwide It is a bit difficult for the design and performance prediction of the tubular pump. Zhu et al [6] applied a multiobjective optimization design system to the design of a middle-highhead pump-turbine runner and concluded that the choice of blade loading and the meridional channel shape is crucial to efficiency and operation stability All their researches have beneficial enlightenment, but without taking the coupled effect of the fluid and solid into account, their concern is mainly the fluid feature. Note that the whole calculation was performed with the commercial software ADINA
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