The present research, focuses on the erosive cavitation behavior around a plane convex hydrofoil. For that, Tthe Zwart-Gerber-Belamri cavitation model has been implemented in library form to be used withto carry out in OpenFOAM. Implicit Large Eddy Simulation (ILES) has been applied to analyze the three dimensional unsteady cavitating flow around a plane convexthe hydrofoil. The numerical results corresponding to hydrodynamic conditions that have been experimentally tested at the high speed cavitation tunnel of the École Polytechnique Fédérale de Lausanne (EPFL) show the sheet cavitation development and the shedding and collapse of vapor clouds. It is noted that cavitation evolution including maximum vapor length, detachment and oscillation frequency are fairly well simulated. Furthermore, the pressure pulses due to the cavitation development as well as complex vortex structures are reasonably predicted. Consequently, these results confirm that the present numerical method can be used to investigate unsteady cavitation around hydrofoils with satisfactory accuracy.
-In this paper, a method based on feed-forward backpropagation artificial neural networks is developed to achieve a more accurate prediction of the useful life of the Francis turbines, subject to the monitoring of the condition. Predicting the remaining life of the Francis turbine components is critical to an effective condition-based maintenance to improve reliability and reduce overall maintenance costs. With the correct instrumentation it is possible to periodically measure and calculate the necessary operating parameters and, in the present investigation, having input data, the vibration severity in speed magnitude and the turbine efficiency, there will be trained a feed-forward backpropagation neural network in such a way as to obtain the Weibull failure rate function of the Francis Turbine. A two-element input vector is introduced with 100 samples for each input; the targets (100 samples) of Weibull failure rate function are also introduced. The method developed, for its consistency and effectiveness, can be generalized to systems and rotating equipment.
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