Zobrazeno 1 - 10
of 79
pro vyhledávání: '"Xavier Escaler"'
Publikováno v:
Foundations, Vol 4, Iss 1, Pp 114-133 (2024)
Nowadays, hydropower plants are being used to compensate for the variable power produced by the new fluctuating renewable energy sources, such as wind and solar power, and to stabilise the grid. Consequently, hydraulic turbines are forced to work mor
Externí odkaz:
https://doaj.org/article/92face34e9144a839a51891d6eed881c
Publikováno v:
Fluids, Vol 9, Iss 9, p 218 (2024)
To study the effects of fluid compressibility on the dynamics of a cavitating vortex street flow in a regime where the vortex shedding frequency increases as a result of the cavitation increase, the cavitating wake behind a wedge was simulated employ
Externí odkaz:
https://doaj.org/article/99d47c93ed6646419f81a6731e08fa41
Publikováno v:
Applied Sciences, Vol 13, Iss 24, p 13285 (2023)
The growing installation of intermittent renewable energy sources is forcing hydraulic turbines to work more frequently at speed no load when dangerous vaneless space vortex structures and stochastic flow phenomena can occur. An experimental campaign
Externí odkaz:
https://doaj.org/article/81a0a624f2384ddc9467752fe6e77000
Publikováno v:
Journal of Marine Science and Engineering, Vol 11, Iss 9, p 1758 (2023)
The operation of submerged rotating machines, such as marine current or tidal turbines, can present deleterious fluid phenomena that may provoke extreme structural vibrations. To predict their dynamic responses, it is necessary to know the added moda
Externí odkaz:
https://doaj.org/article/91ce7c44e5cf4ec8b7c8fe764626f236
Publikováno v:
Journal of Marine Science and Engineering, Vol 11, Iss 9, p 1828 (2023)
Part 2 of this work presents a numerical methodology, validated using the experimental results presented in Part 1, to calculate the added modal coefficients of a submerged cylinder in water both when it oscillates and when it rotates with a whirling
Externí odkaz:
https://doaj.org/article/75e431df4b4e42ea8751d6f4f4773266
Autor:
Xavier Sánchez-Botello, Rafel Roig, Oscar de la Torre, Javier Madrigal, Salvador Sales, Xavier Escaler
Publikováno v:
Sensors, Vol 23, Iss 15, p 6695 (2023)
The structural dynamic response of hydraulic turbines needs to be continuously monitored to predict incipient failures and avoid catastrophic breakdowns. Current methods based on traditional off-board vibration sensors mounted on fixed components do
Externí odkaz:
https://doaj.org/article/f45899db7fa64cdd88b162f6942e3c14
Autor:
Linlin Geng, Xavier Escaler
Publikováno v:
Engineering Applications of Computational Fluid Mechanics, Vol 14, Iss 1, Pp 151-167 (2020)
The numerical simulation of unsteady cavitation flows is sensitive to the selected models and associated parameters. Consequently, three Reynolds Average Navier-Stokes (RANS) turbulence models and the Zwart cavitation model were selected to assess th
Externí odkaz:
https://doaj.org/article/58fcf0509e884fa4a9d5f8685eaabec3
Publikováno v:
Applied Sciences, Vol 13, Iss 5, p 2895 (2023)
The current paper presents an investigation into novel modal testing methods applied to a disk–shaft structure at different rotating speeds in air and water. The structure was excited using three different methods: an instrumented hammer, a piezoel
Externí odkaz:
https://doaj.org/article/6d7e89afd9324c228aeca876b9d2f6fd
Publikováno v:
Energies, Vol 15, Iss 17, p 6311 (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 t
Externí odkaz:
https://doaj.org/article/f41a5f2f093546599bdfbda7ff3215cf
Publikováno v:
Journal of Marine Science and Engineering, Vol 9, Iss 11, p 1198 (2021)
The tip leakage vortex (TLV) has aroused great concern for turbomachine performance, stability and noise generation as well as cavitation erosion. To better understand structures and dynamics of the TLV, large-eddy simulation (LES) is coupled with a
Externí odkaz:
https://doaj.org/article/104ffcabe4db4c6c91f1be986bb51fc3