Vortex energy behaviors in the forebay of lateral pumping station for Y-type channel

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(7)

Published: July 1, 2024

Vortices always happen in the forebay and sump of a lateral pumping station, reducing its efficiency wasting extra electric power. This study utilizes computational fluid dynamics (CFD) technology model test method to investigate distribution vortices station Y-shaped channel. Since vortex is accompanied by energy dissipation, entropy production theory also introduced analyze behaviors anti-vortex bottom sill. The research results indicate that verify accuracy CFD. sill can effectively improve flow pattern reduce rolling behind forebay, enhance axial velocity uniformity at inlet section sump, loss. high zone mainly distributed core top Therefore, shock are main causes square more severe loss compared trapezoidal provide references for setting up hydraulic optimization measures similar stations.

Language: Английский

A review of hydro-turbine unit rotor system dynamic behavior: Multi-field coupling of a three-dimensional model

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(12)

Published: Dec. 1, 2024

The dynamic behavior of hydro-turbine rotor system is a complex multi-field and nonlinear problem, which has been studied by many researchers. analysis the characteristics usually carried out based on bearings, hydraulics, electromagnetics, etc., while thermo-elasto-hydrodynamic bearings are extremely important to numerical accuracy. Therefore, this paper first summarizes research progress in bearing lubrication performance, further characteristics, including modal response characteristics. Finally, main proposes possible directions future research. Literature review shows that runners have achieved coupling three-dimensional (3D) models, some work systems out. transition 3D from single component significant accurately predict solution engineering problems, requires in-depth theory, methods, model integrity, simulation software, spatiotemporal synergy between multi-fields should be fully considered.

Language: Английский

Unsteady Flow Behaviors and Vortex Dynamic Characteristics of a Marine Centrifugal Pump under the Swing Motion

Machines, Journal Year: 2024, Volume and Issue: 12(10), P. 687 - 687

Published: Sept. 30, 2024

Due to the effects of swing motion, performances and internal flow characteristics marine centrifugal pump undergo some unsteady variations in environment. The hydraulic test system with six degree freedom parallel motion platform is established study performance at different heel angles steady roll position pitch position. head gradually decreases as angle increases. has decreased by 7% reach minimum 15° At same angle, lower than that under rated condition. fluid impeller passage subjected additional inertial force or inducing bias phenomena velocity field. development induces intense vortex shedding dissipation interblade vortices are affected. periodic flow-induced pulsation obviously appear passage. periodicity pressure amplitude influenced due motion. greater excitation fluid-induced vibration amplitude. In addition low frequencies, 20 times shaft frequency evident

Language: Английский