Study on Suppression of Cavitating Vortex Rope on Pump-Turbines by J-Groove DOI
Shujiao Pang, Baoshan Zhu,

Yunde Shen

et al.

Published: Jan. 1, 2023

Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI

Language: Английский

Influence of Runner Downstream Structure on the Flow Field in the Draft Tube of a Small-Sized Water Turbine DOI Creative Commons
Lingdi Tang,

Zanya Wang,

Chenjun Zhang

et al.

Applied Sciences, Journal Year: 2024, Volume and Issue: 14(11), P. 4450 - 4450

Published: May 23, 2024

The flow in the draft tube of water turbine is affected by upstream and inherent structure accompanied various undesirable characteristics, affecting efficient stable operation turbine. Changing downstream runner an important measure to reduce hydraulic loss improve stability. In this study, three structures runner, namely, non-locking nut, small locking extended nut are numerically calculated verified using experimental results. unstable characteristics analyzed variations swirling flow, backflow, pressure gradient, vortex strip. results show non-negligible effect which significantly reduces rotational momentum flux at inlet, accelerates decay rate suppresses generation axial low pressure. shortens backflow zone, decreases velocity. zone some sections straight section but prolongs increases

Language: Английский

Citations

0
Temporal-spatial and energy dissipation characteristics of vortex evolutions in Francis turbine during load reduction DOI
Longgang Sun, Lei Liu, Zhaoning Wang

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(9)

Published: Sept. 1, 2024

This study numerically investigates the load reduction effects, on a model Francis turbine, combining cavitation and structured dynamic grid technique. The results indicate that vapor volume in draft tube undergoes two rapid increases decreases until ceases. precessing vortex rope transitions from strong helical structure to axial contraction as ellipticity increases, ultimately forming discrete band before disappearing. Initially, runner gradually linearly, followed by continued growth with consistent pulsation amplitude. inter-blade (IBV) first appears at blade trailing edge then develops into complete extending crown edge, driven pulsating growth. Axial force extracted changes significantly correlates closely variations runner. Flow separation occurs near crown, dual lines enhance IBV formation, which highlights significant influence of crown-proximal flow development. Regarding energy loss, initial are observed both runner, losses consistently exceeding 57.4% 27.1%. Turbulent kinetic generation Reynolds stress primary forms dissipation, high-value regions corresponding locations, underscoring substantial role vortices dissipation. provides new insights evolution dissipation characteristics during turbines.

Language: Английский

Citations

0
A Numerical Investigation of Cavitation-Induced Instabilities and its Mitigation Inside a Draft Tube of a Francis Turbine using an Intrusive Structure DOI
Mohammad Abu Shahzer, Jin‐Hyuk Kim

Lecture notes in mechanical engineering, Journal Year: 2024, Volume and Issue: unknown, P. 579 - 591

Published: Jan. 1, 2024

Language: Английский

Citations

0
Numerical Formulation of Relationship Between Optimized Runner Blade Angle and Specific Speed in a Francis Turbine DOI

Min-Su Roh,

Mohammad Abu Shahzer, Jin‐Hyuk Kim

et al.

Renewable Energy, Journal Year: 2024, Volume and Issue: unknown, P. 121922 - 121922

Published: Nov. 1, 2024

Language: Английский

Citations

0
Study on Suppression of Cavitating Vortex Rope on Pump-Turbines by J-Groove DOI
Shujiao Pang, Baoshan Zhu,

Yunde Shen

et al.

Published: Jan. 1, 2023

Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI

Language: Английский

Citations

0