Examinando por Materia "Fluid dynamic measurements"
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Ítem Diseño de un túnel de viento para prueba de ventiladores y perfiles aerodinámicos(Universidad EAFIT, 2006) Acevedo Vélez, Felipe; Quirós Morales, Luís FernandoÍtem Modelación geométrica del impulsor de una bomba centrífuga(Universidad EAFIT, 2010) Sierra Pérez, Sebastián; Orrego Bustamante, SantiagoEl proyecto de grado Modelación Geométrica del Impulsor de una Bomba Centrífuga, busca desarrollar la construcción de un modelo digital del impulsor en acero inoxidable para una bomba marca Goulds, del modelo con diámetro, con los recursos y herramientas disponibles en la universidad EAFIT -- El diseño del modelo digital, se realizará utilizando herramientas de diseño asistidas por computador CAD (Computer Aided Design), y de análisis de la dinámica de fluidos CFD (Computational Fluid Dynamics), con el apoyo de técnicas de Ingeniería Inversa y herramientas de metrología, de tal forma que el modelo digital diseñado tenga las características de la pieza real -- El análisis de la forma geométrica de la pieza es el primer paso para su reconstrucción digital -- En esta etapa se busca obtener toda la información sobre las medidas geométricas más influyentes en el comportamiento del fluido, como son: la curvatura de los álabes, el diámetro del rodete, el diámetro de la entrada del fluido y la forma del contorno de las tapas superior e inferior -- Para garantizar la similitud geométrica entre el modelo digital y el modelo real del impulsor, el proyecto utilizará el método de evaluación establecido por la norma IEC 60193 de IEC (International Electrotechnical Commission)Ítem Study of the effect of the geometrical parameters of the runner and operation conditions on performance and flow characteristics in a cross flow turbine(Universidad EAFIT, 2014) Peláez Restrepo, Juan Diego; París Londoño, Luis SantiagoDue to technological development, massive use of technology, and accelerated population growth in some regions of the planet, the use of renewable energy sources is important to match the increasing electric energy demand -- Hydropower is an important source of renewable energy around the world, due to its simple but efficient way to provide clean electricity generation -- Currently, the cross flow turbine also known as Banki-Turbine has been increasingly used in many places around the world due to its simple structure, modest efficiency and its good performance in small and low head hydroelectric applications -- It is presumed that the massive utilization of this turbines has been limited due to its low efficiency compared to other turbines with efficiencies near to 90% -- Improving this turbine efficiency would make it more attractive and competitive -- This can be achieved by means of studying the turbine operation and determining the most significant parameters in its performance -- Therefore, the interest of this work is to investigate the performance of the cross flow turbine and the flow characteristics through the turbine -- Two kind of analysis are performed in this work -- The objective of the first analysis is to perform experimental tests of some cross flow turbine prototypes under different operating conditions, and determine its performance -- Due to the differences in the geometrical parameters of the runner on every prototype, an extensive work of design, manufacture and assemble was required for the execution of the experiments in order to obtain satisfactory results -- In the second analysis, CFD simulations of the prototypes are performed with the objective of visualizing the flow through the turbine -- Results show that the turbines with the geometrical parameters selected have a poor performance (approx 50%) under the operating conditions tested -- The prototypes with the best performance are those where the nozzle leads the water to a well defined cross flow in the runner, and the water absolute velocity when entering the runner first and second stage corresponds well to the blade angles -- The prototypes tested show a disordered flow pattern through the runner with big recirculation zones and poorly correspondence with the water velocity vectors and the blade angles, which increases losses and leads to lower efficiencies