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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Simula??o num?rica da intera??o entre uma nuvem incidente de v?rtices e uma aerof?lio atrav?s do m?todo dos v?rtices

Medeiros, ?lson Arnaldo N?ga de 16 September 2005 (has links)
Made available in DSpace on 2014-12-17T14:58:12Z (GMT). No. of bitstreams: 1 ElsonANM.pdf: 918866 bytes, checksum: 54ffb16de332a5a9c76c3afd577bcea1 (MD5) Previous issue date: 2005-09-16 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The study of aerodynamic loading variations has many engineering applications, including helicopter rotor blades, wind turbines and turbo machinery. This work uses a Vortex Method to make a lagrangian description of the a twodimensional airfoil/ incident wake vortex interaction. The flow is incompressible, newtonian, homogeneus and the Reynolds Number is 5x105 .The airfoil is a NACA 0018 placed a angle of attack of the 0? and 5?simulates with the Painel Method with a constant density vorticity panels and a generation poit is near the painel. The protector layer is created does not permit vortex inside the body. The vortex Lamb convection is realized with the Euler Method (first order) and Adans-Bashforth (second order). The Random Walk Method is used to simulate the diffusion. The circular wake has 366 vortex all over positive or negative vorticity located at different heights with respect to the airfoil chord. The Lift was calculated based in the algorithm created by Ricci (2002). This simulation uses a ready algorithm vatidated with single body does not have a incident wake. The results are compared with a experimental work The comparasion concludes that the experimental results has a good agrement with this papper / Este estudo simula numericamente, atrav?s do M?todo de V?rtices, a intera??o entre uma nuvem de circula??o incidente e um aerof?lio NACA 0018 posicionado com ?ngulos de ataque de 0? e 5?. O n?mero de Reynolds utilizado ? de 5x105 e o escoamento ? considerado incompress?vel. Devido a complexidade do fen?meno de geometria tridimensional, apenas uma se??o do aerof?lio ? simulada transformando o trabalho em bidimensional. Utiliza-se o M?todo dos Pain?is com vorticidades distribu?das para simular o corpo e o ponto de gera??o de vorticidade ? deslocado da superf?cie do painel. Uma camada protetora ? criada para evitar a entrada de v?rtices no corpo. A convec??o dos v?rtices de Lamb presentes ? realizada atrav?s dos esquemas de Euler (1?ordem) e de Adams-Bashforth (2?ordem). A difus?o utiliza o M?todo do Avan?o Rand?mico. As cargas de sustenta??o s?o calculadas atrav?s de um algoritmo desenvolvido por Ricci (2002). A nuvem utilizada tem 366 v?rtices com circula??o de +0.001375692 ou -0.001375692 formando um c?rculo de raio 0,2. A simula??o utilizou um algoritmo existente que foi modificado para o problema em quest?o. Validado atrav?s da simula??o do perfil sem a presen?a da nuvem. Os resultados encontrados mostram uma boa concord?ncia com os encontrados em trabalhos experimentais

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