Leading edge hub vortex-induced flow instability and energy loss in a tubular-flow fish-friendly pump

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

Published: March 1, 2025

A kind of flow distortion is found in the design and application so-called tubular-flow fish-friendly pump, which possesses a highly twisted blade leading edge for reducing fish damage. It named as hub vortex (LEHV) has closer relationship with instability energy loss compared to well-known tip leakage (TLV). Numerical experimental investigations are implemented typical terms evolution LEHV size strength, well vortex-induced low pressure loss. The divided into four stages, namely inception, radial development, alternation rotation direction, detachment. dynamics exhibit distinct periodicity varying intensity position due fluctuation rotating pump. Further results on reveal that volume near much larger than under multiple conditions, indicating cavitation inception more likely occur hub, seems different from common sense appears initially at tip. Moreover, it plays significant role causing TLV wake formed by interaction between causes considerable impeller exit. This study will provide scientific guidance optimization strategies pump improve hydraulic performance stability.

Language: Английский

Study of energy dissipation mechanisms and pressure pulsation spectrums in a vertical axial flow pumping station on the ultra-low head condition based on multiple analysis methods

Energy, Journal Year: 2025, Volume and Issue: unknown, P. 135227 - 135227

Published: Feb. 1, 2025

Language: Английский

Numerical simulation of the flow rectification measures in the forebay of the pumping station

Acta hydrotechnica, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 14

Published: May 5, 2025

The kinematics of flow movement in the forebays pumping stations significantly influence efficiency pump operation. This study addresses issue sediment accumulation caused by improper velocity distribution intake structures stations. Research was conducted at water structure Uzbekistan’s Dehqonobod station, located Quva district, Fergana region. involved analyzing hydrodynamic processes within based on principles fluid motion, combining experimental approaches with simulations using COMSOL Multiphysics software suite to develop a 3D structural model prototype structure. Additionally, numerical were performed Newton-Raphson scheme and realizable k-ε turbulence for comparative analysis evaluation. To ensure proper distribution, six vertical columns arranged triangular pattern relative movement, spacing 1 meter between them. arrangement proposed so as enhance technical economic efficiency. results demonstrated that installation increased near right left walls forebay, achieving variation up 20%. Specific recommendations developed optimize conditions improve station's operational

Language: Английский