Results 191 to 200 of about 441 (221)

Measurement of the Self-Oscillating Vortex Rope Dynamics for Hydroacoustic Stability Analysis

Journal of Fluids Engineering, 2015
Flow instabilities in hydraulic machines often feature oscillating cavitation volumes, which locally introduce compliance and mass flow gain effects. These unsteady characteristics play a crucial role in one-dimensional stability models and can be determined through the definition of transfer functions for the state variables, where the cavitation ...
Andres Müller, Keita Yamamoto, Sébastien Alligné, Koichi Yonezawa, Yoshinobu Tsujimoto, François Avellan   +5 more
openaire   +1 more source

Cavitating vortex rope in a diffuser at different operation conditions

Physics of Fluids
A self-induced instability known as vortex rope enhanced by cavitation usually occurs at part load operation conditions in the draft tube and negatively affects the normal operation of Francis turbines. In the present study, the Francis turbine draft tube was simplified and modeled as a diffuser with swirling flow to analyze and understand the flow ...
Diana Puga, Chen Geng, Ziyang Wang, Xianwu Luo   +3 more
openaire   +1 more source

Experimental Investigation Of Double Precessing Vortex Rope Forming In Draft Tube Models

Siberian Journal of Physics, 2015
This work is devoted to the experimental research of the flow structure in draft tube models of hydro turbines. Precessing vortex core was formed using fixed swirler in a flow such as observed in natural hydro turbines under off-design conditions. In laboratory conditions it has been able to find the effect of the transition between single- and double-
Sergey Skripkin, Mikhail Tsoy, Sergey Shtork   +2 more
openaire   +1 more source

Study of Pressure Shock Caused by a Vortex Ring Separated From a Vortex Rope in a Draft Tube Model

Journal of Fluids Engineering, 2017
Operating hydraulic turbines under part- or over-load conditions leads to the development of the precessing vortex rope downstream of the turbine runner. In a regime close to the best efficiency point (BEP), the vortex rope is very unstable because of the low residual swirl of the flow.
S. G. Skripkin, M. A. Tsoy, P. A. Kuibin, S. I. Shtork   +3 more
openaire   +1 more source

Study of vortex rope based on flow energy dissipation and vortex identification

Renewable Energy, 2022
Puxi Li, Ruofu Xiao, Ran Tao
openaire   +1 more source

Study of vortex rope for the flow field pulsation law

Ocean Engineering, 2023
Faye Jin, Puxi Li, Ran Tao, Ruofu Xiao, Di Zhu   +4 more
openaire   +1 more source

Study on Suppression of Cavitating Vortex Rope on Pump-Turbines by J-Groove

Applied Energy, 2023
Shujiao Pang, Baoshan Zhu, Yunde Shen, Zhenmu Chen   +3 more
openaire   +1 more source

Identification on Vortex Rope in Francis Turbine Draft Tube Based on Convkurgram

IEEE Transactions on Instrumentation and Measurement, 2022
Huan Wang, Yaochun Hou, Guangfei Ma, Guangkuan Wu, Da Wang, Bin Huang, Peng Wu, Dazhuan Wu   +7 more
openaire   +1 more source

Magnetic Skyrmion Materials

Chemical Reviews, 2021
Yoshi Tokura, Naoya Kanazawa
exaly  

Tunable topological charge vortex microlaser

Science, 2020
Zhifeng Zhang, Xingdu Qiao, Bikashkali Midya   +2 more
exaly