Results 1 to 10 of about 184,150 (234)
Vortex rope instabilities in a model of conical draft tube [PDF]
EPJ Web of Conferences, 2017 We report on experimental studies of the formation of vortex ropes in a laboratory simplified model of hydroturbine draft tube. Work is focused on the observation of various flow patterns at the different rotational speed of turbine runner at fixed flow ...
Skripkin Sergey +3 more
doaj +5 more sources
Measurement of Gas-Liquid Two-Phase Flow in Draft Tube
Shanghai Jiaotong Daxue xuebaoThe limitation of traditional measurement technology in gas-liquid two-phase flow measurement is broken through.The liquid velocity field and vortex rope morphology from two vertical directions were measured synchronically by using particle image ...
LI Jinfeng, CHEN Wuguang, ZHANG Zhengchuan, XU Yongliang, LI Kaiying, YIN Junlian, WANG Dezhong
doaj +1 more source
Geophysical Research Letters, 2023 With high‐resolution data from Magnetospheric Multiscale (MMS) mission, an ion‐scale flux rope (FR) with a heavily tilted axis is observed in the tailward outflow of a magnetic reconnection in the terrestrial magnetotail.
K. Jiang +4 more
doaj +1 more source
Engineering Applications of Computational Fluid Mechanics, 2023 Precessing vortex rope (PVR) plays a key role in inducing hydraulic resonance in Francis turbines operating at partial load, possibly degrading power plant stability and availability.
Longgang Sun +3 more
doaj +1 more source
Journal of Marine Science and EngineeringPumped storage units often deviate from the optimal operating conditions in the process of regulating new energy fluctuations. To effectively improve the performance of the units, the variable speed of the units is one of the more feasible means at ...
Guangtai Shi +4 more
doaj +1 more source
Wind-Induced Response and Its Controlling of Long-Span Cross-Rope Suspension Transmission Line
Applied Sciences, 2022 In mountainous areas, the installation of steel towers was the major obstacle to the construction of transmission lines. In long-span cross-rope suspension (CRS) structures, the conductors are supported by hundreds-meters-long suspension cables crossing ...
Zhengliang Li, Yujing Hu, Xi Tu
doaj +1 more source
Vortex of beam shift induced by mono-chiral interface states
New Journal of Physics, 2020 If an electron beam hits onto the interface of a Weyl-node-mismatch junction, a shift of the beam center on the interface happens when the beam is reflected or transmitted, where the junction consists of two materials of the same Weyl semimetal and one ...
Mou Yang, Quan-Teng Hou, Rui-Qiang Wang
doaj +1 more source
Applied SciencesPump-turbines are critical for maintaining power grid stability, but they frequently suffer from flow instabilities induced by cavitation due to frequent operating condition changes.
Yanhao Li, Lei Chen, Jianwen Xu, An Yu
doaj +1 more source
Energies, 2022 The present paper demonstrates a proof-of-concept by introducing a variable guide vane system in the draft tube of a high-head Francis model turbine. The aim is to examine the hydraulic performance of the turbine while mitigating the pressure pulsations ...
Jesline Joy +2 more
doaj +1 more source
Energy distribution and chaotic pressure pulsation analysis of vortex ropes in Francis-99
Engineering Applications of Computational Fluid MechanicsFrancis turbines, essential for stability in diverse operating conditions and variable-speed scenarios, encounter efficiency-compromising vortex rope formations in the draft tube, leading to substantial pressure fluctuations.
Puxi Li +5 more
doaj +1 more source