Staggered impeller configuration effects on energy transfer and pressure stability in two-stage centrifugal pumps for pumped-storage applications

Journal of Energy Storage, Год журнала: 2025, Номер 112, С. 115514 - 115514

Опубликована: Янв. 27, 2025

Язык: Английский

Study on pressure field characteristics of high specific speed axial flow pump under full working conditions based on wavelet transform

Physics of Fluids, Год журнала: 2025, Номер 37(2)

Опубликована: Фев. 1, 2025

Axial flow pumps are widely used in ship jet propulsion units and coastal plain pumping stations. In the actual operation process, axial need to operate extreme working conditions, order explore safety stability of operating under special this paper adopts a method that combines model experiment numerical simulation. A full-condition pump section (AFPS) is carried out on high-precision system test platform. Meanwhile, simulation predicting full characteristics AFPS constructed. Numerical simulations for at 31 rates, hydrodynamic investigated depth 8 which reveals internal evolution synergistic influence water direction impeller steering whole quadrant. The traditional analysis Fast Fourier Transform difficult analyze dynamic changes such complex non-smooth signal field conditions pumps. paper, wavelet transform pressure pulsation signals time–frequency two-dimensional plane multiple scales, capture subtle changes, cross relationships different locations, comprehensively deeply spatiotemporal transformation section. results show when opposite rotation impeller, disordered strong. Except forward turbine condition rotating (OP4) condition, energy inlet greater than outlet with maximum difference eight times (OP5). between has large number common frequencies.

Язык: Английский

Analysis of transient hydraulic failure mechanisms induced by gate malfunction during shutdown of large axial flow pump systems

Engineering Failure Analysis, Год журнала: 2025, Номер unknown, С. 109673 - 109673

Опубликована: Май 1, 2025

Язык: Английский