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Estudio del comportamiento de capa límite y de los fenómenos en la región cercana a la pared en un perfil hidrodinámico helicoidal de una turbina Gorlov de flujo cruzado a bajos números de Reynolds
dc.rights.license | Atribución-NoComercial 4.0 Internacional |
dc.contributor.advisor | Duque Daza, Carlos Alberto |
dc.contributor.author | Botero Henao, Andrés |
dc.date.accessioned | 2020-09-23T21:23:20Z |
dc.date.available | 2020-09-23T21:23:20Z |
dc.date.issued | 2018-06-04 |
dc.identifier.uri | https://repositorio.unal.edu.co/handle/unal/78493 |
dc.description.abstract | The present work shows the study of the performance of a helical blade subjected to a water flow stream. Blades with helical geometry are principally used in tidal turbines because of their minimum fluctuating torque conditions in the sea environment and for the reduction that this fact makers on the structural loads on the turbines. One blade was simulated using CFD with transient formulation and a LES turbulence model. The results were validated against 2 reference works showing good agreement in the majority of the variables obtained. Later, an analysis in local coordinates was made in the critic zones of each case in order to determine de behaviour of the flow near the wall. In this analysis, the results were compared with theoretical results showing good agreement in general as well. The proposed model, even showing similarity with the reference works, is more conservative because it sub predicts the output torque for all cases. It is shown that the zones of minimum torque are regions dominated by recirculation, as the obtained results suggest. |
dc.description.abstract | El presente trabajo muestra el estudio del desempeño hidrodinámico de un perfil helicoidal sometido a una corriente de agua. Los perfiles con geometría son utilizados principalmente en turbinas mareomotrices por las mínimas condiciones de oscilación del torque que ofrece este diseño y por la disminución que esto representa en las cargas cíclicas que experimenta la turbina. Un álabe fue simulado en condición estática en 4 posiciones diferentes utilizando mecánica de fluidos computacional con una formulación transitoria en 3D y un modelo de turbulencia LES. Los resultados obtenidos se validaron con 2 trabajos de referencia mostrando similitud en la gran mayoría de variables obtenidas. Posteriormente se realizó un estudio a nivel local en las zonas consideradas críticas para determinar el comportamiento del flujo en regiones cercanas a la pared. En este análisis, los resultados fueron comparados con resultados teóricos y en general se presentan acorde a lo propuesto. La metodología de trabajo, si bien presenta similitud con los trabajos de referencia, es mas conservador, pues subpredice el torque de salida para todos los casos. Se muestra también que las zonas de torque mínimo son regiones dominadas por la recirculación de flujo, según lo muestran los resultados obtenidos. |
dc.format.extent | 80 |
dc.format.mimetype | application/pdf |
dc.language.iso | spa |
dc.rights | Derechos reservados - Universidad Nacional de Colombia |
dc.rights.uri | http://creativecommons.org/licenses/by-nc/4.0/ |
dc.subject.ddc | 530 - Física::532 - Mecánica de fluidos |
dc.subject.ddc | 530 - Física::537 - Electricidad y electrónica |
dc.title | Estudio del comportamiento de capa límite y de los fenómenos en la región cercana a la pared en un perfil hidrodinámico helicoidal de una turbina Gorlov de flujo cruzado a bajos números de Reynolds |
dc.type | Otro |
dc.rights.spa | Acceso abierto |
dc.description.additional | Línea de Investigación: Dinámica de fluidos computacional y Energías renovables |
dc.type.driver | info:eu-repo/semantics/other |
dc.type.version | info:eu-repo/semantics/acceptedVersion |
dc.publisher.program | Bogotá - Ingeniería - Maestría en Ingeniería - Ingeniería Mecánica |
dc.contributor.researchgroup | GNUM - Modelado y métodos numéricos en ingeniería. |
dc.description.degreelevel | Maestría |
dc.publisher.branch | Universidad Nacional de Colombia - Sede Bogotá |
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dc.rights.accessrights | info:eu-repo/semantics/openAccess |
dc.subject.proposal | Perfil helicoidal |
dc.subject.proposal | Helicoidal profile |
dc.subject.proposal | CFD |
dc.subject.proposal | CFD |
dc.subject.proposal | Torque de salida |
dc.subject.proposal | Output torque |
dc.subject.proposal | Shear stress |
dc.subject.proposal | Esfuerzo cortante |
dc.type.coar | http://purl.org/coar/resource_type/c_1843 |
dc.type.coarversion | http://purl.org/coar/version/c_ab4af688f83e57aa |
dc.type.content | Text |
oaire.accessrights | http://purl.org/coar/access_right/c_abf2 |
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