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

---

Study on the trajectory of tip leakage vortex and energy characteristics of mixed-flow pump under cavitation conditions

Ocean Engineering, Journal Year: 2022, Volume and Issue: 267, P. 113225 - 113225

Published: Dec. 8, 2022

Language: Английский

---

Study on the liquid jet and shock wave produced by a near-wall cavitation bubble containing a small amount of non-condensable gas

International Communications in Heat and Mass Transfer, Journal Year: 2023, Volume and Issue: 145, P. 106815 - 106815

Published: May 4, 2023

Language: Английский

---

Analysis of the effect of cavitation on internal fluid excitation characteristics of centrifugal pumps

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(8)

Published: Aug. 1, 2024

To explore the influence of cavitation on internal fluid excitation characteristics pumps, numerical simulations and performance testing evaluations were performed IS65-50-125 centrifugal pump. The prototype pump's exterior characteristic curves, as well its bubble volume distribution, successfully replicated using computations. effect pressure pulsation pump under various operating situations was comprehensively investigated, indicating a relationship between degree root mean square values pulsation. Special emphasis placed changes in features at intermediate high frequencies, processes rising vortex shedding impeller trailing edge validate simulation results, vibration noise platform built, studies intensity sound field conducted. experimental results revealed that level rose conditions deteriorated, confirming modeling results. This study's significant innovation is precise identification different by monitoring an in-depth discussion impact mechanism phenomena behavior pumps. study demonstrates differences suction sides situations, process creation generated bubbles input channel during severe cavitation. gives new theoretical basis for reduction, improvements stability.

Language: Английский

---

Real-time prediction method of three-dimensional flow field for pumping station units operation under geometrically variable conditions based on reduced-order model and machine learning

Engineering Analysis with Boundary Elements, Journal Year: 2025, Volume and Issue: 175, P. 106205 - 106205

Published: March 9, 2025

Language: Английский

---

Multi-objective optimization of centrifugal pumps based on extreme learning machine with Adaptive Non-dominated Sorting Genetic Algorithms III

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(3)

Published: March 1, 2025

In order to improve the hydraulic performance and operational stability of centrifugal pumps, this paper selects M192-400 pumps as research object ensure that pump head, efficiency does not decrease reduce axial force much possible optimization goal, using Plackett–Burman screening test will be impeller balance hole diameter, radial position, circumferential placement angle four geometric parameters variables. The optimal Latin hypercubic sampling method was used create a sample space 90 groups, variables were fitted targets extreme learning machine. Multi-objective is carried out by Adaptive Non-dominated Sorting Genetic Algorithms III, solutions 14 mm, 68.08 −22°, 6.62° are obtained hierarchical analysis validity which verified. Compared with initial model, optimized increased head 1.28%, 0.17%, reduced 96.47% meet target. Before after wall pressure, cross-sectional velocity, flow lines, turbulent kinetic energy distribution differences analyzed. makes improved, basic force, for design provide reference basis.

Language: Английский

---

Multi-Objective Optimization of Gas-Liquid Two-Phase High-Speed Centrifugal Pump

International journal of engineering research in Africa, Journal Year: 2025, Volume and Issue: 73, P. 117 - 134

Published: May 16, 2025

In order to improve the head and efficiency of centrifugal pumps reduce shaft power under gas-liquid two-phase(GLTP) conditions, a high-speed pump model Q5H26 was taken as research object. Studies have shown that when gas content is between 0 % 25 %, its performance decreases significantly: increases, while decrease, indicating has negative impact on effective operation pump. pump, sensitivity blade inlet outlet angle, cover plate thickness number analyzed by multi-objective programming (MOP) model, these key parameters were optimized genetic algorithm. The shows better various operating conditions. This study effectively fills gap in optimization field gas-containing liquid treatment. Through numerical simulation experimental comparison, condition rated working 10 content, increased 7.8 1.9 m, reduced 37 W. These results not only prove method can significantly two-phase but also provide valuable reference for design this field. especially suitable industrial applications where efficient energy-saving operations are required. It provides practical solution treatment liquids, thereby making up shortcomings existing technologies.

Language: Английский

---

Flow-induced noise mechanism and optimization design of electronic expansion valve

Vacuum, Journal Year: 2022, Volume and Issue: 204, P. 111335 - 111335

Published: July 19, 2022

Language: Английский

---

Liquid hydrogen centrifugal pump optimization based on reducing hydraulic loss and improving cavitation

International Journal of Hydrogen Energy, Journal Year: 2023, Volume and Issue: 49, P. 1419 - 1431

Published: Sept. 4, 2023

Language: Английский

---

Exploring the effect of the inlet gas volume fraction on the energy-conversion features of a multiphase pump using energy-transport theory

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(4)

Published: April 1, 2024

This work sought to reveal the role of inlet gas volume fraction (GVF) on energy-conversion features a multiphase pump. To this end, self-developed single-stage pump was used as research object, and gas–liquid transport medium examined based energy-transport theory. The GVF in pressure-gradient work, Lamb-vector divergence, vortex pseudo-energy dissipation pressurization unit were analyzed, impact also investigated. results indicate that under various GVFs, increasing tip clearance prevents pressure gradient from exerting its intended function. Furthermore, is increased, scale tip-leakage increases, flow field disturbed, impeller increases. As result, energy loss effect weakened, performance decreases. These offer reference for enhancing efficiency pumps.

Language: Английский

---