DDES analysis of unsteady flow evolution and pressure pulsation at off-design condition of a centrifugal pump

Dynamic measurements on unsteady pressure pulsations and flow distributions in a nuclear reactor coolant pump

Euler–Lagrange study of cavitating turbulent flow around a hydrofoil

Numerical analysis of the vortical structure and its unsteady evolution of a centrifugal pump

The influence of surface roughness on the pump performance was deeply analyzed based on computational fluid dynamics (CFD). A series of numerical calculations with different grid numbers, turbulence models, and surface roughness were made for a typical multistage centrifugal pump. Moreover, the external characteristic experiments were also conducted to verify the numerical calculations. The results show that the surface roughness has enormous influences on the pump performance. With the increase of the surface roughness, the head and the efficiency of the pump decreases continuously, but the decreasing rate slows down gradually, and the surface roughness has a greater influence on the efficiency than that on the head. Moreover, the influence of surface roughness on the disk friction loss power is much greater than that on the hydraulic power. Besides, the total efficiency of the pump reduces mainly by decreasing the hydraulic efficiency and the mechanical efficiency, due to the negative effect of surface roughness. In addition, the surface roughness of the impeller and the diffuser mainly affects the hydraulic efficiency, the surface roughness of the shroud's outer wall mainly influences the mechanical efficiency, and the surface roughness of the inner wall of the pump cavity mainly affects the volume efficiency, but the influence of surface roughness on the pump performance is interconnected. Therefore, due to that, it's very difficult to make the precision-machine inside the impeller and diffuser, polishing the impeller shroud and pump cavity is beneficial to improve the pump efficiency and reduce the pump shaft power.

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Leqin Wang

Papers

Dynamic analysis of a planar multi-stage centrifugal pump rotor system based on a novel coupled model

Effects of microvortex generators on cavitation erosion by changing periodic shedding into new structures