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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

An?lise aerodin?mica de perfis de asa para aeronaves experimentais tipo jn-1

Ribeiro, Fernanda Alves 25 February 2011 (has links)
Made available in DSpace on 2014-12-17T14:58:10Z (GMT). No. of bitstreams: 1 FernandaAR_DISSERT.pdf: 8485678 bytes, checksum: eca5de592a0a48a71b782d8289da3a31 (MD5) Previous issue date: 2011-02-25 / The great importance in selecting the profile of an aircraft wing concerns the fact that its relevance in the performance thereof; influencing this displacement costs (fuel consumption, flight level, for example), the conditions of flight safety (response in critical condition) of the plane. The aim of this study was to examine the aerodynamic parameters that affect some types of wing profile, based on wind tunnel testing, to determine the aerodynamic efficiency of each one of them. We compared three types of planforms, chosen from considerations about the characteristics of the aircraft model. One of them has a common setup, and very common in laboratory classes to be a sort of standard aerodynamic, it is a symmetrical profile. The second profile shows a conFiguration of the concave-convex type, the third is also a concave-convex profile, but with different implementation of the second, and finally, the fourth airfoil profile has a plano-convex. Thus, three different categories are covered in profile, showing the main points of relevance to their employment. To perform the experiment used a wind tunnel-type open circuit, where we analyzed the pressure distribution across the surface of each profile. Possession of the drag polar of each wing profile can be, from the theoretical basis of this work, the aerodynamic characteristics relate to the expected performance of the experimental aircraft, thus creating a selection model with guaranteed performance aerodynamics. It is believed that the philosophy used in this dissertation research validates the results, resulting in an experimental alternative for reliable implementation of aerodynamic testing in models of planforms / A import?ncia na escolha do perfil de asa de uma aeronave ? fun??o de sua relev?ncia no seu desempenho; influenciando desde os custos de deslocamento (consumo de combust?vel, n?vel de v?o, por exemplo), a condi??es de seguran?a do v?o (resposta em condi??es cr?ticas) do avi?o. O objetivo deste trabalho foi analisar quatro perfis de asa a fim de determinar alguns dos principais par?metros envolvidos no comportamento aerodin?mico e determinar a efici?ncia de cada um deles baseado em experimenta??o em t?nel de vento. Compararam-se quatro perfis de asa, escolhidos a partir de considera??es acerca das caracter?sticas do modelo da aeronave. Um deles apresenta uma configura??o sim?trica usual, sendo muito comum em aulas de laborat?rio por ser uma esp?cie de padr?o aerodin?mico. O segundo perfil apresenta uma configura??o do tipo c?ncavo-convexo; o terceiro, tamb?m ? um perfil c?ncavo-convexo, por?m, com aplica??o distinta do segundo; e, finalmente, o quarto aerof?lio possui um perfil plano-convexo. Para a realiza??o do experimento utilizou-se um t?nel aerodin?mico do tipo circuito aberto, onde analisaram-se as distribui??es de press?o em toda a superf?cie de cada perfil. De posse da curva polar de arrasto de cada perfil de asa pode-se, a partir da base te?rica deste trabalho, relacionar as caracter?sticas aerodin?micas ? expectativa de desempenho da aeronave experimental tipo JN-1, gerando assim um modelo de sele??o com garantia de performance aerodin?mica. Acredita-se que a filosofia de pesquisa utilizada nesta disserta??o legitima os resultados obtidos, consistindo-se em uma alternativa experimental confi?vel para execu??o de testes aerodin?micos em modelos de perfis de asa

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