Estudio numérico y simulación para la toma de datos de impacto debido al colapso de cavidades sobre superficies bajo condiciones de flujo cavitativo

Abstract

The present work is focuses on the choice of a sensor, its size, quantity and location in a convex hydrodynamic wing with a semi-cylindrical obstacle for the measurement of the forces produced by the implosion of cavities. The knowledge of the area damaged by cavitation helps to improve designs and increase the useful life of hydraulic machines. For the established purposes, the numerical study was carried out to determine the magnitude of the impact pressures, starting from the work carried out by Víctor Hidalgo in his doctoral thesis called "Numerical study on unsteady cavitating Flow and erosion based on homogeneous mixture assumption" and using his cavitation model proposed. For the simulation of the sensors, the calibration curves are used, which give approximate values of the real behavior. Then, the necessary conditioning was performed, which allows transmitting the captured signals to be able to visualize the pressure in an interface developed for the effect. To justify the use of the two sensors analyzed, studies based on similar experiments were taken as a basis and finally, for the election, the corrected ordinal method of weighted criteria was used, resulting in the acceptable way to measure cavitation impacts is the use of PVDF piezoelectric sensors.