Results 31 to 40 of about 9,992 (233)
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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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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On the Rotating Vortex Rope and Its Induced Structural Response in a Kaplan Turbine Model
Energies, 2022 The rotating vortex rope, which can be decomposed in the rotating and the plunging modes, is the origin of pressure fluctuations in the draft tube cone when hydraulic turbines operate at part load, compromising the structural integrity and limiting the output load.
Rafel Roig +4 more
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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
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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
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May 12 1997 Cme Event: I. a Simplified Model of the Pre-Eruptive Magnetic Structure
, 2007 A simple model of the coronal magnetic field prior to the CME eruption on May 12 1997 is developed. First, the magnetic field is constructed by superimposing a large-scale background field and a localized bipolar field to model the active region (AR) in ...
J. A. Linker +6 more
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On the upper part load vortex rope in Francis turbine: Experimental investigation [PDF]
IOP Conference Series: Earth and Environmental Science, 2010 The swirling flow developing in Francis turbine draft tube under part load operation leads to pressure fluctuations usually in the range of 0.2 to 0.4 times the runner rotational frequency resulting from the so-called vortex breakdown. For low cavitation number, the flow features a cavitation vortex rope animated with precession motion.
C Nicolet +3 more
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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
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A two-fluid helicity transport model for flux-rope merging
, 2014 A two-fluid model for canonical helicity transport between merging flux-ropes is developed. Relative canonical helicity is defined here as the gauge invariant helicity of the canonical momentum of a given species, and represents the generalization of ...
You, Setthivoine
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