Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Oscillation of Cavitating Vortices in Draft Tubes of a Simplified Model Turbine and a Model Pump–Turbine. / Skripkin, Sergey; Zuo, Zhigang; Tsoy, Mikhail и др.
в: Energies, Том 15, № 8, 2965, 01.04.2022.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Oscillation of Cavitating Vortices in Draft Tubes of a Simplified Model Turbine and a Model Pump–Turbine
AU - Skripkin, Sergey
AU - Zuo, Zhigang
AU - Tsoy, Mikhail
AU - Kuibin, Pavel
AU - Liu, Shuhong
N1 - Funding Information: Funding: The study of the simplified turbine (ST) and development of an analytical approach were supported by a grant from the Russian Science Foundation (project no. 21-79-10080), the study of the pump–turbine (PT) was supported by the National Natural Science Foundation of China (no. 52076120 and no. 52079066), the open Fund of State Key Laboratory of Eco-hydraulics in Northwest Arid Region (no. 2018KFKT-10), the State Key Laboratory of Hydroscience and Engineering (2019-KY-04, sklhse-2019-E-02 and sklhse-2020-E-03), and the Creative Seed Fund of Shanxi Research Institute for Clean Energy, Tsinghua University. Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2022/4/1
Y1 - 2022/4/1
N2 - The self-oscillation of the cavitating vortices is one of the dangerous phenomena of hydraulic turbine operation near full-load conditions. This work is an attempt to generalize data and expand insight on the phenomenon of self-excited oscillations by comparing the experimental results obtained on a simplified turbine and scaled-down pump–turbine models. In both cases, a series of high-speed imaging was carried out, which made it possible to study these phenomena with high temporal resolution. The high-speed imaging data was subjected to additional processing such as binarization, cropping, and scaling. For a simplified turbine model, the volume of the vapor cavity was calculated based on the assumption of the axial symmetry of the cavity, after which fast Fourier transform (FFT) analysis was carried out. A proper orthogonal decomposition (POD) analysis was also performed to examine individual modes in the original digital imaging data. For the pump–turbine, visualization data on the cavitation cavity oscillations were supplemented by pressure measurements in the draft tube cone to determine the frequency characteristics. Based on obtained experimental data, an improved one-dimensional model describing the oscillations of the cavitation cavity arising behind the hydraulic turbine runner is proposed.
AB - The self-oscillation of the cavitating vortices is one of the dangerous phenomena of hydraulic turbine operation near full-load conditions. This work is an attempt to generalize data and expand insight on the phenomenon of self-excited oscillations by comparing the experimental results obtained on a simplified turbine and scaled-down pump–turbine models. In both cases, a series of high-speed imaging was carried out, which made it possible to study these phenomena with high temporal resolution. The high-speed imaging data was subjected to additional processing such as binarization, cropping, and scaling. For a simplified turbine model, the volume of the vapor cavity was calculated based on the assumption of the axial symmetry of the cavity, after which fast Fourier transform (FFT) analysis was carried out. A proper orthogonal decomposition (POD) analysis was also performed to examine individual modes in the original digital imaging data. For the pump–turbine, visualization data on the cavitation cavity oscillations were supplemented by pressure measurements in the draft tube cone to determine the frequency characteristics. Based on obtained experimental data, an improved one-dimensional model describing the oscillations of the cavitation cavity arising behind the hydraulic turbine runner is proposed.
KW - cavitating vortices
KW - high-speed visualization
KW - proper orthogonal decomposition (POD)
KW - pump–turbine
KW - turbine
UR - http://www.scopus.com/inward/record.url?scp=85129123377&partnerID=8YFLogxK
U2 - 10.3390/en15082965
DO - 10.3390/en15082965
M3 - Article
AN - SCOPUS:85129123377
VL - 15
JO - Energies
JF - Energies
SN - 1996-1073
IS - 8
M1 - 2965
ER -
ID: 36048500