Analysis of Pressure Pulsation and Structural Characteristics of Vertical Shaft Cross-Flow Pumps

Abstract

In order to study the pressure pulsation characteristics and structural dynamic response characteristics of a vertical shaft cross-flow pump, this study used a computational fluid dynamics (CFD) numerical simulation method to analyze the pressure pulsation characteristics of the inlet passage, impeller, and guide vane positions of the vertical shaft cross-flow pump device. At the same time, this study analyzed the equivalent stress–strain characteristics of the impeller and guide vane of a vertical shaft cross-flow pump based on fluid structure coupling technology and comprehensively analyzed the deformation modes of the impeller blades and guide vanes under dynamic water flow. This research shows that due to the influence of rotor–stator interaction, the amplitude of pressure pulsation at the interface between the impeller and guide vane of the pump device is the largest and that the main frequency distribution at this position is relatively complex. The non-uniformity of stress distribution at the impeller position gradually decreases with an increase in the radial distance. The high stress and strain zones of the impeller and guide vane are concentrated at the root of the blade. This study can provide reference for hydraulic optimization design and stable operation of similar pump devices.

Research on the Influence of Lateral Force and Pressure Fluctuation on the Stability of a Rotary Energy Recovery Device in the Desalination System

“…In simulation, it was discovered that the unbalanced lateral force acting on the outer wall of the rotor through the liquid in the circular clearance in the direction perpendicular to the rotation axis was too large. According to the experience of the pump and fluid-excited vibration research, this force might affect rotary speed via changing the resistance torque of the rotor; meanwhile, its fluctuation can influence the stability of the rotor [33,34]. Therefore, the investigation of lateral force, pressure fluctuation and their effects on the stability of RERD in practice is of great significance to improve the stability of the RO desalination process through finding the method to make the rotary speed more stable, less affected by operating pressure and with less fluctuation.…”