Results 21 to 30 of about 441 (221)
Machines, 2022 Small vessels operating in coastal waters are susceptible to propeller failure because of the entanglement of marine debris. Secondary accidents such as the injury of divers may also occur when removing entangling material.
Antony John Nyongesa +8 more
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Diffuser Shape Optimization Using Adjoint Solver [PDF]
MATEC Web of ConferencesShape optimization of a diffuser with vortex generator on the inlet that mimics the impeller of a Francis turbine was performed. The optimization is based on the use of the adjoint solver in ANSYS Fluent.
Pham Jakub, Rudolf Pavel
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Coupling Mechanisms Between Vortex Rope Evolution and Cavitation Within the Draft Tube of Pump-turbines [PDF]
Journal of Applied Fluid MechanicsA technique integrating numerical simulations with experimental observations was hereby employed to elucidate the flow instability mechanisms during transient processes in pump-turbines, and a reversible pump-turbine was investigated for in-depth ...
L. Xin, Q. Li, S. Zhang
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Damping force of air acting on vibrating elevator rope
Mechanical Engineering Journal, 2021 This paper describes the vibration damping characteristics of elevator ropes acted on by air. High-rise buildings sometimes resonate during earthquakes, and the elevator ropes in the building may swing significantly as a result. The vibration analysis of
Raichi TAKUMI, Hideo UTSUNO
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Geophysical Research Letters, 2023 Two types of filamentary currents (FCs) were observed inside a magnetic flux rope at the magnetopause by the Magnetospheric Multiscale mission. The first FC is identified as an electron vortex, while the other is a reconnecting current sheet.
Shimou Wang +6 more
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Images of vortex ropes could improve hydraulic machinery safety
Scilight, 2021 Researchers analyzed the generation and transformation of cavitation vortex ropes with high resolution images.
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Hydroelectric System Response to Part Load Vortex Rope Excitation
IOP Conference Series: Earth and Environmental Science, 2016 The prediction of pressure and output power fluctuations amplitudes on Francis turbine prototype is a challenge for hydro-equipment industry since it is subjected to guarantees to ensure smooth and reliable operation of the hydro units. The European FP7 research project Hyperbole aims to setup a methodology to transpose the pressure fluctuations ...
S Alligné +5 more
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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
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POD analysis of a vortex rope with transient boundary conditions
IOP Conference Series: Earth and Environmental Science, 2019 Abstract The paper presents the results of a POD analysis of the flow in a swirl generator. The generator has two separate inlets – one straight axial inlet and one tangential inlet ended by a spiral case. This allows to set different operating points, which are in turn connected with different shapes of the vortex rope present in the ...
Ondřej Urban, Pavel Rudolf
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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
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