IFLUIDS - Grup de Recerca Barcelona Fluids & Energy Labhttp://hdl.handle.net/2117/3414022024-03-28T19:03:34Z2024-03-28T19:03:34ZOn the rotating vortex rope and its induced structural response in a Kaplan turbine modelRoig Bauzà, RafelSánchez Botello, XavierEscaler Puigoriol, Francesc XavierMulu, BerhanuHögström, Carl-Maikelhttp://hdl.handle.net/2117/3732182024-02-11T03:38:57Z2022-09-21T10:54:37ZOn the rotating vortex rope and its induced structural response in a Kaplan turbine model
Roig Bauzà, Rafel; Sánchez Botello, Xavier; Escaler Puigoriol, Francesc Xavier; Mulu, Berhanu; Högström, Carl-Maikel
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. A measurement campaign was carried out in a Kaplan turbine model which is a replica of the experimental 10 MW Porjus U9 prototype machine along a propeller curve to study the rotating vortex rope’s excitation levels and the induced structural responses. A complete set of sensors mounted on-board and off-board was used to measure pressures, forces, torques, accelerations, displacements, and strains. The characteristic frequencies and amplitudes of the pressure fluctuations and of the corresponding induced loads and vibrations associated with the two modes were quantified in a wide range of operating conditions at part load. The two modes are detected at different frequencies depending on the sensor position. Moreover, their frequencies change depending on the discharge and present different amplitudes depending on the mode. Particularly, the rotating mode shows higher amplitudes than the plunging mode in the majority of positions and directions measured.
2022-09-21T10:54:37ZRoig Bauzà, RafelSánchez Botello, XavierEscaler Puigoriol, Francesc XavierMulu, BerhanuHögström, Carl-MaikelThe 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. A measurement campaign was carried out in a Kaplan turbine model which is a replica of the experimental 10 MW Porjus U9 prototype machine along a propeller curve to study the rotating vortex rope’s excitation levels and the induced structural responses. A complete set of sensors mounted on-board and off-board was used to measure pressures, forces, torques, accelerations, displacements, and strains. The characteristic frequencies and amplitudes of the pressure fluctuations and of the corresponding induced loads and vibrations associated with the two modes were quantified in a wide range of operating conditions at part load. The two modes are detected at different frequencies depending on the sensor position. Moreover, their frequencies change depending on the discharge and present different amplitudes depending on the mode. Particularly, the rotating mode shows higher amplitudes than the plunging mode in the majority of positions and directions measured.Prediction of cavitation erosion with different erosion risk indicatorsGeng, LinlinZhang, DingliChen, JianTorre Rodríguez, Óscar de laEscaler Puigoriol, Francesc Xavierhttp://hdl.handle.net/2117/3632852024-03-01T01:29:54Z2022-03-02T10:33:02ZPrediction of cavitation erosion with different erosion risk indicators
Geng, Linlin; Zhang, Dingli; Chen, Jian; Torre Rodríguez, Óscar de la; Escaler Puigoriol, Francesc Xavier
This present work devoted to simulate the unsteady cavitating flow around a hydrofoil and assess its erosion power predicted by different erosion risk indicators. For that, the behavior of unsteady cloud cavity is numerically reproduced using density corrected Shear Stress Transport (SST) k-¿ turbulence model and the mass transfer between vapor and water phases is modelled with the Schnerr-Sauer cavitation model. The definitions of different erosion risk indicators are mathematically derived and their performance on predicting erosion power is compared systematically. The results demonstrate that indicator, defined only with the rapid temporal variations of the pressure, is unable to distinguish the erosion area caused by cavity collapse. And the erosion risk indicator defined by time derivative of flow properties is unable to capture the main erosion occurred on the cavity closure region because the high erosion power on such area is mainly contributed by the advection term. In addition, it is founded that the full form of erosion power definition, defined by material derivative, is the best erosion indicator which can well predict the most eroded area and thus is recommended to be applied in the industrial and practical applications.
2022-03-02T10:33:02ZGeng, LinlinZhang, DingliChen, JianTorre Rodríguez, Óscar de laEscaler Puigoriol, Francesc XavierThis present work devoted to simulate the unsteady cavitating flow around a hydrofoil and assess its erosion power predicted by different erosion risk indicators. For that, the behavior of unsteady cloud cavity is numerically reproduced using density corrected Shear Stress Transport (SST) k-¿ turbulence model and the mass transfer between vapor and water phases is modelled with the Schnerr-Sauer cavitation model. The definitions of different erosion risk indicators are mathematically derived and their performance on predicting erosion power is compared systematically. The results demonstrate that indicator, defined only with the rapid temporal variations of the pressure, is unable to distinguish the erosion area caused by cavity collapse. And the erosion risk indicator defined by time derivative of flow properties is unable to capture the main erosion occurred on the cavity closure region because the high erosion power on such area is mainly contributed by the advection term. In addition, it is founded that the full form of erosion power definition, defined by material derivative, is the best erosion indicator which can well predict the most eroded area and thus is recommended to be applied in the industrial and practical applications.Scale adaptive simulation of unsteady cavitation flow around a plane convex hydrofoil with a semi-cylindrical obstacleHidalgo Díaz, Víctor HugoEscaler Puigoriol, Francesc XavierDiaz, A.Luo, XSimbaña, Stalyn FabianMarquez, D.Hernandez, P.Valencia, E.http://hdl.handle.net/2117/3617522022-02-14T02:14:29Z2022-02-07T10:06:33ZScale adaptive simulation of unsteady cavitation flow around a plane convex hydrofoil with a semi-cylindrical obstacle
Hidalgo Díaz, Víctor Hugo; Escaler Puigoriol, Francesc Xavier; Diaz, A.; Luo, X; Simbaña, Stalyn Fabian; Marquez, D.; Hernandez, P.; Valencia, E.
The present study focuses on the numerical simulation of unsteady cavitating flow around a plane-convex hydrofoil with a semi-cylindrical obstacle, which is based on the cavitationerosion experiment perform at LMH-EPFL using the vortex cavitation generator tunnel. The turbulence model k-¿ SST SAS method, which presents advantages in terms of computational consumption and reproduction of the phenomenon, has been applied in OpenFOAM version 4 to reproduce the unsteady behavior of cavitating flow. Additionally, the Zwart-Gerber-Belamri (ZGB) cavitation model has been applied, based on a previous work where this model was implemented in OpenFOAM. The model is based on Rayleigh Plesset equation, which considers small cavities with changes of void fraction for condensation and vaporization and using empirical calibration numbers based on previous research. Regarding the mesh development, the present work explores two configurations of grid mesh containing hexahedra (hex) and split-hexahedra (split-hex) automatically generated from triangulated surface geometries based on previous numerical studies. The aforementioned method aims to optimize computational demand and phenomenon reproducibility. Results show that the unsteady cavitating flows behavior has been reproduced with good accuracy and shows special details which are important for erosion studies in futures works.
2022-02-07T10:06:33ZHidalgo Díaz, Víctor HugoEscaler Puigoriol, Francesc XavierDiaz, A.Luo, XSimbaña, Stalyn FabianMarquez, D.Hernandez, P.Valencia, E.The present study focuses on the numerical simulation of unsteady cavitating flow around a plane-convex hydrofoil with a semi-cylindrical obstacle, which is based on the cavitationerosion experiment perform at LMH-EPFL using the vortex cavitation generator tunnel. The turbulence model k-¿ SST SAS method, which presents advantages in terms of computational consumption and reproduction of the phenomenon, has been applied in OpenFOAM version 4 to reproduce the unsteady behavior of cavitating flow. Additionally, the Zwart-Gerber-Belamri (ZGB) cavitation model has been applied, based on a previous work where this model was implemented in OpenFOAM. The model is based on Rayleigh Plesset equation, which considers small cavities with changes of void fraction for condensation and vaporization and using empirical calibration numbers based on previous research. Regarding the mesh development, the present work explores two configurations of grid mesh containing hexahedra (hex) and split-hexahedra (split-hex) automatically generated from triangulated surface geometries based on previous numerical studies. The aforementioned method aims to optimize computational demand and phenomenon reproducibility. Results show that the unsteady cavitating flows behavior has been reproduced with good accuracy and shows special details which are important for erosion studies in futures works.Rotatory 3D structured mesh study using openFOAM to simulate the flow in francis turbineHidalgo Díaz, Víctor HugoCando, E.Mora, CarlosEscaler Puigoriol, Francesc XavierVelasco, M.Simbaña, Stalyn FabianPuga, DianaValencia, E.http://hdl.handle.net/2117/3617302023-05-18T00:27:17Z2022-02-04T14:28:28ZRotatory 3D structured mesh study using openFOAM to simulate the flow in francis turbine
Hidalgo Díaz, Víctor Hugo; Cando, E.; Mora, Carlos; Escaler Puigoriol, Francesc Xavier; Velasco, M.; Simbaña, Stalyn Fabian; Puga, Diana; Valencia, E.
The development of a methodology to simulate numerically the steady state flow field in Francis turbines was carried out using the open source CFD software OpenFOAM along with a MRF and AMI approach. A structured mesh obtained from previous studies was used with some modifications to solve the presence of imbalance points in the simulation. Numerical simulations using the SIMPLE algorithm were performed together with two different turbulence models. It was confirmed that the results obtained reproduced the phenomenon with a great approximation and predicted the output load with only a deviation of around 5.02% against experimental data
2022-02-04T14:28:28ZHidalgo Díaz, Víctor HugoCando, E.Mora, CarlosEscaler Puigoriol, Francesc XavierVelasco, M.Simbaña, Stalyn FabianPuga, DianaValencia, E.The development of a methodology to simulate numerically the steady state flow field in Francis turbines was carried out using the open source CFD software OpenFOAM along with a MRF and AMI approach. A structured mesh obtained from previous studies was used with some modifications to solve the presence of imbalance points in the simulation. Numerical simulations using the SIMPLE algorithm were performed together with two different turbulence models. It was confirmed that the results obtained reproduced the phenomenon with a great approximation and predicted the output load with only a deviation of around 5.02% against experimental dataSimulación numérica con computador del rodete de la CH CarcavillaEscaler Puigoriol, Francesc Xavierhttp://hdl.handle.net/2117/3615112022-02-02T14:50:25Z2022-02-02T14:41:17ZSimulación numérica con computador del rodete de la CH Carcavilla
Escaler Puigoriol, Francesc Xavier
2022-02-02T14:41:17ZEscaler Puigoriol, Francesc XavierEvaluación de mediciones vibratorias realizadas en la CH Carcavilla el 29 de Abril de 2021Escaler Puigoriol, Francesc XavierJou Santacreu, Estebanhttp://hdl.handle.net/2117/3615082022-02-02T14:40:29Z2022-02-02T14:38:40ZEvaluación de mediciones vibratorias realizadas en la CH Carcavilla el 29 de Abril de 2021
Escaler Puigoriol, Francesc Xavier; Jou Santacreu, Esteban
2022-02-02T14:38:40ZEscaler Puigoriol, Francesc XavierJou Santacreu, EstebanEvaluación del efecto del cambio de geometría del borde de salida del álabe de la CH Carcavilla (VERSIÓN 2)Escaler Puigoriol, Francesc Xavierhttp://hdl.handle.net/2117/3614762022-02-02T12:40:24Z2022-02-02T12:35:46ZEvaluación del efecto del cambio de geometría del borde de salida del álabe de la CH Carcavilla (VERSIÓN 2)
Escaler Puigoriol, Francesc Xavier
2022-02-02T12:35:46ZEscaler Puigoriol, Francesc XavierEvaluación del efecto del cambio de geometría del borde de salida del álabe de la CH Carcavilla (VERSIÓN 3)Escaler Puigoriol, Francesc Xavierhttp://hdl.handle.net/2117/3614752022-02-02T12:40:19Z2022-02-02T12:33:26ZEvaluación del efecto del cambio de geometría del borde de salida del álabe de la CH Carcavilla (VERSIÓN 3)
Escaler Puigoriol, Francesc Xavier
2022-02-02T12:33:26ZEscaler Puigoriol, Francesc XavierEvaluación del efecto del cambio de geometría del borde de salida del álabe de la CH Carcavilla (VERSIÓN 3 modificada)Escaler Puigoriol, Francesc Xavierhttp://hdl.handle.net/2117/3614742022-02-02T12:30:42Z2022-02-02T12:27:40ZEvaluación del efecto del cambio de geometría del borde de salida del álabe de la CH Carcavilla (VERSIÓN 3 modificada)
Escaler Puigoriol, Francesc Xavier
2022-02-02T12:27:40ZEscaler Puigoriol, Francesc XavierEvaluación del efecto del cambio de geometría del borde de entrada del álabe de la CH Carcavilla con la modificación V3 60Escaler Puigoriol, Francesc Xavierhttp://hdl.handle.net/2117/3614732022-02-02T12:30:37Z2022-02-02T12:24:40ZEvaluación del efecto del cambio de geometría del borde de entrada del álabe de la CH Carcavilla con la modificación V3 60
Escaler Puigoriol, Francesc Xavier
Simular la modificación del borde de entrada de los álabes
2022-02-02T12:24:40ZEscaler Puigoriol, Francesc XavierSimular la modificación del borde de entrada de los álabes