Investigation Into The Internal Flow Field Of A Series-parallel Centrifugal Pump

Series-parallel centrifugal pump is a new type of centrifugal pump which can achieve low flow-high lift and high flow-low lift two working conditions by a reversing valve. It can be used as an important security equipment of the ship to protect the safety of the ship timely by transporting liquids effectively. In this paper, a series-parallel centrifugal pump is selected as the model to invest the internal flow filed under rated condition using numerical methods. The influence of blades and impeller outlet angles on the internal flow field, especially the pressure pulsation, is also explored.The author first introduces some preliminary theory in computational fluid dynamics (CFD) and pressure fluctuations. Then the key components of the series-parallel is designed and the modeling and meshing work is accomplished. By comparing the calculation results of different turbulence models with the experiment, the most suitable setup of the calculation is determined. Through the analysis of simulation results, a preliminary understanding of the pressure pulsation characteristics of the flow field inside the series-parallel centrifugal pump is acquired, as well as the influence of blades and impeller outlet angles on the pressure pulsation. The results shows that both blades and impeller outlet angles can affect the pressure fluctuation amplitude at blade passing frequency and its multiplication. However, the influence of blades and impeller outlet angles of the pressure pulsation amplitude are different. The research of the series-parallel centrifugal pump provides a certain reference for the subsequent optimization of the design in order to reduce the pressure pulsation, as well as vibration and noise control.