Diseño y simulación de un sistema para la toma de datos de impactos debido al colapso de cavidades sobre superficies bajo condiciones de flujo cavitativo

Abstract

In the present dissertation a data acquisition system for the measurement of impacts by cavitation was designed and simulated. The objective of the study is related to the pressure measurement of microjets, whose maximum peaks are associated with the greatest erosive damage. The data used to develop this work are based on the mathematical modeling and simulation generated by Ing. Víctor Hidalgo, DSc, in his doctoral thesis entitled "Numerical study on unsteady cavitating flow and erosion based on homogeneous mixture assumption" [1]. The model reproduces erosion for a cavitation process on the surface of a convex hydrofoil with an obstacle, inside a cavitation generating tunnel. For the established purposes, two methods of dynamic pressure sensing are investigated. A piezoelectric gauge type PVDF sensor and a piezoresistive manganin gauge were selected and conditioned. The conditioning methods use a charge integration stage for the PVDF gauge and resistance bridge conditioning for the manganin gauge. For the simulation developed in Labview software, the pressure incident in the active area of the sensor is considered as a sum of instantaneous pressures of microjet. The pressures data required by the sensor are imported in the form of tables, to integrate the measurement and visualization stage. Finally, the total cost is analyzed and the conclusion is that the PVDF piezoelectric gauge is an appropriate option for measuring dynamic pressures up to 10 [GPa].