Diseño paramétrico, optimización multiobjetivo y simulación CFD de una bomba funcionando como turbina para la generación eléctrica a partir de un canal de riego

Abstract

The objective of present document is to establish parametric design of a pump impeller operating in turbine mode (PAT), based on characteristics of source for hydroelectric generation (flow and net height); same that currently supplies an irrigation system in Cotopaxi province. Civil works were determined based on water flow and height. Water flow which was obtained through general duration curve (CDG), and height is function of place’s topography. In micro and mini hydroelectric projects, a flow that is 90% of time is recommended, however geometric differences using Q-90% flow rate or a larger one Q-30% are minimal and their influence is low on project’s total cost. In this sense flow rate (Q-30%) was chosen. Within multiobjective optimization process through genetic algorithms, impeller’s speed and width at exit of it, erosion factor, as well as efficiency were selected, as objective functions. Decision variables are impeller diameter and impeller’s angle of exit, and number of blades. Process ends with results validation in CFD.