Optimization of pump transient energy characteristics based on response surface optimization model and computational fluid dynamics

Applied Energy, Journal Year: 2024, Volume and Issue: 362, P. 123038 - 123038

Published: March 16, 2024

Language: Английский

---

Energy dissipation mechanism of tip-leakage cavitation in mixed-flow pump blades

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(1)

Published: Jan. 1, 2024

Tip leakage flow is one of the significant factors influencing internal stability mixed-flow pumps, and in severe cases, it can lead to channel blockage energy loss. In order gain a deeper understanding dissipation mechanism induced by tip vortex cavitation, this study based on Wray–Agarwal (WA) turbulence model homogeneous model, investigating cavitation characteristics pumps. Additionally, entropy production theory employed evaluate losses within pump analyze components loss impeller guide vanes. The research results reveal that with increasing intensity, low-pressure region at leading edge blade extends toward trailing edge, static pressure distribution blade's side. Leakage spatial vortices move closer suction side intensity. Cavitation primarily affects region, turbulent being main source High zones are concentrated blade, correlating recirculation trailing-edge vortices. This provides theoretical insights practical implications for enhancing performance offering valuable guidance design operation.

Language: Английский

---

Effect of circumferential spokes on the rotating stall flow field of mixed-flow pump

Energy, Journal Year: 2024, Volume and Issue: 290, P. 130260 - 130260

Published: Jan. 4, 2024

Language: Английский

---

Exploring a new criterion to determine the onset of cavitation in centrifugal pumps from energy-saving standpoint; experimental and numerical investigation

Energy, Journal Year: 2024, Volume and Issue: 293, P. 130681 - 130681

Published: Feb. 15, 2024

Language: Английский

---

Energy loss and pressure fluctuation characteristics of coastal two-way channel pumping stations under the ultra-low head condition

Energy, Journal Year: 2023, Volume and Issue: 278, P. 127953 - 127953

Published: May 29, 2023

Language: Английский

---

Vortex dynamics characteristics in the tip region based on Wray–Agarwal model

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(1)

Published: Jan. 1, 2024

In order to solve the blockage effect and energy dissipation phenomenon caused by cavitation in low-pressure vortex core region, this paper analyzes spatial evolution of vorticity intensity turbulent kinetic under different conditions based on Wray–Agarwal (WA) model. First, tip leakage flow characteristics are studied, is analyzed, then distribution blade region finally, transport analyzed. It found that rate less affected leakage, there a strong interaction between at leading edge trailing edge, separation vortices low-speed regions formed end-wall cause passage. Low pressure causes cover most suction surface, inhibiting formation development vortices. The range high almost same as high-vorticity positive correlation two intensities. Severe outlet passage develop radial axial directions impeller, which increases loss. change mainly reflected expansion contraction term, Coriolis force term plays dominant role process. This provides reference for further improving performance mixed-flow pumps.

Language: Английский

---

Effect of pressure ratio on transient flow in hydrogen circulating pump

International Journal of Hydrogen Energy, Journal Year: 2023, Volume and Issue: 48(69), P. 26937 - 26950

Published: April 12, 2023

Language: Английский

---

Study on the influence of volute structure on the performance of seawater-pumped storage hydropower plant unit

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 90, P. 111848 - 111848

Published: May 9, 2024

Language: Английский

---

Study on the pump cavitation characteristic through novel independent rotation of inducer and centrifugal impeller in co-rotation and counter-rotation modes

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(1)

Published: Jan. 1, 2024

The influence of counter-rotation between the inducer and impeller, along with a newly introduced system for their independent rotation on pump cavitation characteristics, has been studied experimentally. Remarkably, this allows users to select co-rotation modes, providing significant operational adaptability. high-speed camera is used analyze vaporization structures closely monitor stability head pressure delivered by during testing phase. For both different types within impeller at three varied flow rates have using image analysis. results reveal improved performance comparable efficiency consistent pressure–flowrate combinations, emphasizing advantages across tested rates. In mode, tangential velocity output opposite that mode. Consequently, entering reduced, leading enhanced increased pressure. findings from analysis demonstrate structure varies modes. Reversing direction not only improves characteristics but also changes vapor due in pattern.

Language: Английский

---

Mechanism of the impact of sediment particles on energy loss in mixed-flow pumps

Energy, Journal Year: 2024, Volume and Issue: 304, P. 132166 - 132166

Published: June 22, 2024

Language: Английский

---