Numerical analysis of flow around a fan blade of a CFM56-3

• Autor(a) principal: Pereira, Bernardo Correia
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.6/6462
• topic: Cfm56-3; Dfc; Fan; Mach Number; Pressão Total; Tap-Me; Turbofan; Domínio/Área Científica::Engenharia e Tecnologia::Outras Engenharias e Tecnologias

This work was performed in cooperation with TAP maintenance and engineering, speci cally the engine shop’s engineering team. The main goal is to analyze the ow around a fan blade of a CFM56-3 engine. The ow analysis around a blade intends essentially to learn the relations between the chord variation and the consequent changes in the ow properties, particularly two, mach number and total pressure, and doing after a results validation process using the TAP-ME test bench readings as a reference. The Navier-Stokes equations for compressible and adiabatic ow are the governing equations of this problem. However, it was necessary to adapt these equatios for a reference moving frame, so as to be adjusted to a rotating fan problem. The averaged Navier-Stokes equations are resolved along with the K-W SST turbulence model. The control volume of this problem was divided in three domains (inlet, blade and outlet) and three different blade chords were created (small, medium and Large). After control volume construction the grids were created using the software Turbomesh, two domains use structured grids and the third uses an unstructured grid and the suitable boundary conditions are applied. It was chosen the commercial software ANSYS CFX 15 as the most suitable for this study, then six simulations are performed, three of those simulations were executed in take-off regime and the other three in maximum continuous. After the completion of the simulations and the results obtained, the most relevant for this investigation are selected. The numerical solutions were analyzed in detail for the convergence and accuracy in order to guarantee the quality of those solutions. The results are then presented for all simulations in several views and for two essential properties, mach number and total pressure. Then a comparative analysis is performed for two parameters in order to learn the differences between variations in blade chord and different regimes. Subsequently, there is an analysis to validate the numerical model, in which the numerical solutions are compared with experimental data taken from one of the databases of the TAP-ME test bench. The comparison is made for some parameters that can be measured on the test bench and is then completed and the validity of the model is proofed since there is good agreement between values. Finally, are present the main ndings of this research and are also indicated some proposals for future works as well as work that is currently under development, which aims to apply the results of this work.