Estudio del flujo bifásico líquido-sólido y la erosión por partículas sólidas en una turbina francis, en base al análisis de la influencia de los modelos de turbulencia rans convencionales (k-omega y k-epsilon).

Abstract

Abstract.-The present work evaluates the influence of the conventional RANS turbulence models, being the K- ε (standard and realizable) and K- ω (standard and SST) on the erosion by solid particles in a Francis type turbine. In this way, these two different models are compared to define which one has a better numerical prediction of the erosion and the solid liquid two-phase flow. The methodology of this project starts with taking points of the different components of the Francis turbine using reverse engineering, then these points are corrected in order to be meshed using the commercial software TURBOGRID. Using real operating conditions of the San Francisco hydroelectric power plant, the simulation of the 3 components of the turbine (runner, guide vanes and fixed blades) is performed in the commercial software FLUENT. In addition, the simulation was validated by means of an experiment, which was successfully simulated in FLUENT software and with a meshing performed in ICEM. The results obtained show that the phenomenon was captured with a good approximation.Although the results of both models are quite similar, a better appreciation of the phenomenon is observed in the K- ω SST model, but this model requires a higher computational resource