Numerical simulation of centrifugal pumps

The power computers increase and the specific calculation software development have made possible, nowadays, the numerical simulation of flow and energy transfer inside the turbomachinery. To teach Fluid Mechanics is not easy not only for the professors but also for the students because the theoretical part must be complemented with a technical part where students can see the phenomena. However, specially in hydraulic turbomachinery, we canít see the phenomena except if we have a specific material, for example a PIV. Even if we would have this material, the access to specific parts of turbomachinery is not possible due to its constructive layout. The use of numerical simulation tools allows us to obtain data in inaccessible positions for the experimentation, as well as the study of unusual or dangerous performances. With the numerical simulation, the pressure fluctuation at any point of the pump can be easily obtained. Other important results are the radial forces on the impeller, which have a significant variation with the working points. One of the advantages of this kind of modelling is the ease to carry out changes in the geometry, parametric studies and analysis of anomalous operation conditions

Analysis of an attached sunspace with a thermal inertia floor

An attached sunspace is a partially or fully glazed enclosure, usually located on the first floor, facing south (in the Northern Hemisphere) and adjacent to a conditioned room. Because of the length and orientation of the glazed area, the temperature in the sunspace is usually higher than outside the building. As a Trombe–Mitchel wall, the sunspace has a considerable mass that accumulates thermal energy, but in this case the thermal mass is located in the floor. This capacity to accumulate thermal energy confers the attached sunspace features beyond passive insulation. The sunspace studied in this paper is part of an experimental building located in the North of Spain that was built in the frame of the so-called ARFRISOL project. It consists of a south-facing glazed exterior wall with both clear glass and semi-transparent photovoltaic panels, an intermediate space with a thick layer of sand over a concrete floor, and a partially glazed interior wall. In this paper, a three-dimensional computational model has been implemented to analyse the thermal behaviour inside the sunspace. This analysis takes into account, among other factors, the effects of sun position, incident solar irradiation and temperature both inside and outside

Aplicación de la semejanza en mecánica de fluidos: concurso de diseño y lanzamiento de paracaídas

[SPA] Se trata de construir paracaídas a escala de manera que pueda transportar un peso determinado y lo deposite en el suelo sin que se rompa. Se presenta una metodología de trabajo en grupos formados por tres alumnos basada en el diseño de paracaídas. Los estudiantes llevan a cabo cálculos teóricos para estimar el tamaño del paracaídas para que lleve a cabo la misión encomendada. Al finalizar el plazo de ejecución del proyecto se realiza un concurso en el que cada grupo lanza su paracaídas. Esta metodología docente se evaluó mediante una encuesta proporcionada a los alumnos cuyos resultados se muestran en la parte final del artículo.[ENG] This paper presents an active methodology of group work based on the design of parachutes. For this purpose small groups of 3 students are constituted. The students have to design a parachute to reach a specific task. At the end of the implementation period of the project we carry out a competition where each group launches its parachute. This teaching methodology was evaluated by means of a survey that was provided to the students. The results of the survey are shown at the end of the paper.Campus Mare Nostrum, Universidad Politécnica de Cartagena, Universidad de Murcia, Región de Murci

El aprendizaje orientado a proyectos en Mecánica de Fluidos a través de la experimentación con cohetes de agua

A water rocket can be as simple as a plastic bottle for soft drinks containing water and pressurized air. The pressure of the air expels a jet of water through the nozzle when the cap is opened which, in turn, increases the velocity of the bottle so that it can be propelled to significant distances or heights. This paper describes a project-based learning field practice on the topic of water rockets. The main objective is to design a water rocket, in addition to the air filling and launching system, with the purpose of either hitting a target or reaching a maximum distance. The students have to carry out the necessary calculations and experimental tests to estimate the optimum launching parameters that allow meeting the goal proposed. The projects are evaluated in a public contest where each of the groups of students launches its water rocket. This teaching methodology was evaluated by means of an opinion survey whose results are presented at the final part of the paper.Un cohete de agua puede estar formado por algo tan simple como una botella de plástico para refresco en la que se introduce agua y aire a presión. El aire presurizado expulsa un chorro de agua por la boquilla al abrir el tapón, lo que provoca un aumento de la velocidad de la botella y su propulsión a distancias o alturas importantes. En este artículo se describe una práctica de campo basada en el aprendizaje orientado a proyectos y cuyo eje principal es la experimentación con cohetes de agua. El objetivo es diseñar un cohete de agua, así como su sistema de llenado de aire y de disparo, para que alcance un blanco concreto o bien una distancia máxima. Los estudiantes deben realizar los cálculos teóricos y las pruebas experimentales necesarias para estimar los parámetros óptimos de lanzamiento que permitan alcanzar el objetivo propuesto. Los proyectos se evalúan en un concurso público en el que cada grupo lanza su cohete de agua. La eficacia de esta metodología docente se evaluó mediante una encuesta cuyos resultados se presentan en la parte final del artículo

Unsteady rotor-stator interaction in an axial flow blower. Part II: Deterministic stresses analysis

ASME 2005 Fluids Engineering Division Summer Meeting (2005, Texas

Simulación virtual en la enseñanza: aplicación al diseño de bombas

Congreso Internacional de Comunicación, Tecnología y Educación (3º. 2000. Oviedo

Introduction to the Fluid Dynamics of Biological Flows. Innovation Project using the CFD simulation of the lung air flow

Congreso Universitario de Innovación Educativa En las Enseñanzas Técnicas, CUIEET (26º. 2018. Gijón