About the effects of an oscillating miniflap upon the wake on an airfoil, all immersed in turbulent flow
- Autores
- Delnero, Juan Sebastián; Marañón Di Leo, Julio; Colman Lerner, Jorge León; Camocardi, Mauricio Ezequiel; García Saínz, Mariano Oscar; Muñoz, Federico
- Año de publicación
- 2011
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The present research analyzes the asymmetry in the rolling up shear layers behind the blunt trailing edge of an airfoil 4412 with a miniflap acting as active flow control device and its wake organization. Experimental investigations relating the asymmetry of the vortex flow in the near wake region, able to distort the flow increasing the downwash of an airfoil, have been performed. All of these in a free upstream turbulent flow (1.8% intensity). We examine the near wake region characteristics of a wing model with a 4412 airfoil without and with a rotating miniflap located on the lower surface, near the trailing edge. The flow in the near wake, for 3 x-positions (along chord line) and 20 vertical points in each x-position, was explored, for three different rotating frequencies, in order to identify signs of asymmetry of the initial counter rotating vortex structures. Experimental evidence is presented showing that for typical lifting conditions the shear layer rollup process within the near wake is different for the upper and lower vortices: the shear layer separating from the pressure side of the airfoil begins its rollup immediately behind the trailing edge, creating a stronger vortex while the shear layer from the suction side begins its rollup more downstream creating a weaker vortex. The experimental data were processed by classical statistics methods. Aspects of a mechanism connecting the different evolution and pattern of these initial vortex structures with lift changes and wake alleviating processes, due to these miniflaps, will be studied in future works.
Laboratorio de Capa Límite y Fluidodinámica Ambiental - Materia
-
Ingeniería Aeronáutica
oscillating miniflap
airfoil
Turbulencia - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by/3.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/84367
Ver los metadatos del registro completo
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About the effects of an oscillating miniflap upon the wake on an airfoil, all immersed in turbulent flowDelnero, Juan SebastiánMarañón Di Leo, JulioColman Lerner, Jorge LeónCamocardi, Mauricio EzequielGarcía Saínz, Mariano OscarMuñoz, FedericoIngeniería Aeronáuticaoscillating miniflapairfoilTurbulenciaThe present research analyzes the asymmetry in the rolling up shear layers behind the blunt trailing edge of an airfoil 4412 with a miniflap acting as active flow control device and its wake organization. Experimental investigations relating the asymmetry of the vortex flow in the near wake region, able to distort the flow increasing the downwash of an airfoil, have been performed. All of these in a free upstream turbulent flow (1.8% intensity). We examine the near wake region characteristics of a wing model with a 4412 airfoil without and with a rotating miniflap located on the lower surface, near the trailing edge. The flow in the near wake, for 3 x-positions (along chord line) and 20 vertical points in each x-position, was explored, for three different rotating frequencies, in order to identify signs of asymmetry of the initial counter rotating vortex structures. Experimental evidence is presented showing that for typical lifting conditions the shear layer rollup process within the near wake is different for the upper and lower vortices: the shear layer separating from the pressure side of the airfoil begins its rollup immediately behind the trailing edge, creating a stronger vortex while the shear layer from the suction side begins its rollup more downstream creating a weaker vortex. The experimental data were processed by classical statistics methods. Aspects of a mechanism connecting the different evolution and pattern of these initial vortex structures with lift changes and wake alleviating processes, due to these miniflaps, will be studied in future works.Laboratorio de Capa Límite y Fluidodinámica Ambiental2011-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/84367enginfo:eu-repo/semantics/altIdentifier/issn/1742-6588info:eu-repo/semantics/altIdentifier/doi/10.1088/1742-6596/318/6/062005info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/3.0/Creative Commons Attribution 3.0 Unported (CC BY 3.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:16:10Zoai:sedici.unlp.edu.ar:10915/84367Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:10.455SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
About the effects of an oscillating miniflap upon the wake on an airfoil, all immersed in turbulent flow |
title |
About the effects of an oscillating miniflap upon the wake on an airfoil, all immersed in turbulent flow |
spellingShingle |
About the effects of an oscillating miniflap upon the wake on an airfoil, all immersed in turbulent flow Delnero, Juan Sebastián Ingeniería Aeronáutica oscillating miniflap airfoil Turbulencia |
title_short |
About the effects of an oscillating miniflap upon the wake on an airfoil, all immersed in turbulent flow |
title_full |
About the effects of an oscillating miniflap upon the wake on an airfoil, all immersed in turbulent flow |
title_fullStr |
About the effects of an oscillating miniflap upon the wake on an airfoil, all immersed in turbulent flow |
title_full_unstemmed |
About the effects of an oscillating miniflap upon the wake on an airfoil, all immersed in turbulent flow |
title_sort |
About the effects of an oscillating miniflap upon the wake on an airfoil, all immersed in turbulent flow |
dc.creator.none.fl_str_mv |
Delnero, Juan Sebastián Marañón Di Leo, Julio Colman Lerner, Jorge León Camocardi, Mauricio Ezequiel García Saínz, Mariano Oscar Muñoz, Federico |
author |
Delnero, Juan Sebastián |
author_facet |
Delnero, Juan Sebastián Marañón Di Leo, Julio Colman Lerner, Jorge León Camocardi, Mauricio Ezequiel García Saínz, Mariano Oscar Muñoz, Federico |
author_role |
author |
author2 |
Marañón Di Leo, Julio Colman Lerner, Jorge León Camocardi, Mauricio Ezequiel García Saínz, Mariano Oscar Muñoz, Federico |
author2_role |
author author author author author |
dc.subject.none.fl_str_mv |
Ingeniería Aeronáutica oscillating miniflap airfoil Turbulencia |
topic |
Ingeniería Aeronáutica oscillating miniflap airfoil Turbulencia |
dc.description.none.fl_txt_mv |
The present research analyzes the asymmetry in the rolling up shear layers behind the blunt trailing edge of an airfoil 4412 with a miniflap acting as active flow control device and its wake organization. Experimental investigations relating the asymmetry of the vortex flow in the near wake region, able to distort the flow increasing the downwash of an airfoil, have been performed. All of these in a free upstream turbulent flow (1.8% intensity). We examine the near wake region characteristics of a wing model with a 4412 airfoil without and with a rotating miniflap located on the lower surface, near the trailing edge. The flow in the near wake, for 3 x-positions (along chord line) and 20 vertical points in each x-position, was explored, for three different rotating frequencies, in order to identify signs of asymmetry of the initial counter rotating vortex structures. Experimental evidence is presented showing that for typical lifting conditions the shear layer rollup process within the near wake is different for the upper and lower vortices: the shear layer separating from the pressure side of the airfoil begins its rollup immediately behind the trailing edge, creating a stronger vortex while the shear layer from the suction side begins its rollup more downstream creating a weaker vortex. The experimental data were processed by classical statistics methods. Aspects of a mechanism connecting the different evolution and pattern of these initial vortex structures with lift changes and wake alleviating processes, due to these miniflaps, will be studied in future works. Laboratorio de Capa Límite y Fluidodinámica Ambiental |
description |
The present research analyzes the asymmetry in the rolling up shear layers behind the blunt trailing edge of an airfoil 4412 with a miniflap acting as active flow control device and its wake organization. Experimental investigations relating the asymmetry of the vortex flow in the near wake region, able to distort the flow increasing the downwash of an airfoil, have been performed. All of these in a free upstream turbulent flow (1.8% intensity). We examine the near wake region characteristics of a wing model with a 4412 airfoil without and with a rotating miniflap located on the lower surface, near the trailing edge. The flow in the near wake, for 3 x-positions (along chord line) and 20 vertical points in each x-position, was explored, for three different rotating frequencies, in order to identify signs of asymmetry of the initial counter rotating vortex structures. Experimental evidence is presented showing that for typical lifting conditions the shear layer rollup process within the near wake is different for the upper and lower vortices: the shear layer separating from the pressure side of the airfoil begins its rollup immediately behind the trailing edge, creating a stronger vortex while the shear layer from the suction side begins its rollup more downstream creating a weaker vortex. The experimental data were processed by classical statistics methods. Aspects of a mechanism connecting the different evolution and pattern of these initial vortex structures with lift changes and wake alleviating processes, due to these miniflaps, will be studied in future works. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-12 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://sedici.unlp.edu.ar/handle/10915/84367 |
url |
http://sedici.unlp.edu.ar/handle/10915/84367 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
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info:eu-repo/semantics/altIdentifier/issn/1742-6588 info:eu-repo/semantics/altIdentifier/doi/10.1088/1742-6596/318/6/062005 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/3.0/ Creative Commons Attribution 3.0 Unported (CC BY 3.0) |
eu_rights_str_mv |
openAccess |
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http://creativecommons.org/licenses/by/3.0/ Creative Commons Attribution 3.0 Unported (CC BY 3.0) |
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