Numerical study on the optimization of the two-way passage division pier and the energy loss in the pumping device

Abstract The widespread utilization of the Two-way passage pumping device (TPPD) in riverside areas notwithstanding, there exists a notable inadequacy in quantitative research pertaining to its energy and hydraulic characteristics. On the basis of division pier optimization, the entropy production theory (EPT) with computational fluid dynamics is applied to analyse the energy loss characteristic of TPPD. The results show that after the optimization of the two-way passage division pier, the flow pattern in passages is improved, the vortex structure scale in passages is obviously reduced, and the hydraulic performance is improved. The predominant cause of energy loss within TPPD stems from turbulent dissipation due to fluctuations within the impeller, leading to the formation of irregular areas with heightened entropy production (EP) along the blade surface and within the impeller channel. Moreover, the energy loss within passages is predominantly localized near the centre of the pump unit.