Numerical Analysis and Redesign of a High Speed Linear Cascade Wind Tunnel for Aircraft Gas Turbine Engines Testing

Galletti, Ludovico (2022) Numerical Analysis and Redesign of a High Speed Linear Cascade Wind Tunnel for Aircraft Gas Turbine Engines Testing. [Laurea magistrale], Università di Bologna, Corso di Studio in Ingegneria meccanica [LM-DM270], Documento full-text non disponibile
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Abstract

Linear cascade testing serves a fundamental role in the research, development, and design of turbomachines as it is a simple yet very effective way to compute the performance of a generic blade geometry. These kinds of experiments are usually carried out in specialized wind tunnel facilities. This thesis deals with the numerical characterization and subsequent partial redesign of the S-1/C Continuous High Speed Wind Tunnel of the Von Karman Institute for Fluid Dynamics. The current facility is powered by a 13-stage axial compressor that is not powerful enough to balance the energy loss experienced when testing low turning airfoils. In order to address this issue a performance assessment of the wind tunnel was performed under several flow regimes via numerical simulations. After that, a redesign proposal aimed at reducing the pressure loss was investigated. This consists of a linear cascade of turning blades to be placed downstream of the test section and designed specifically for the type of linear cascade being tested. An automatic design procedure was created taking as input parameters those measured at the outlet of the cascade. The parametrization method employed Bézier curves to produce an airfoil geometry that could be imported into a CAD software so that a cascade could be designed. The proposal was simulated via CFD analysis and proved to be effective in reducing pressure losses up to 41%. The same tool developed in this thesis could be adopted to design similar apparatuses and could also be optimized and specialized for the design of turbomachines components.

Abstract
Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Galletti, Ludovico
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Indirizzo
Macchine a fluido
Ordinamento Cds
DM270
Parole chiave
Turbine,Linear cascade,Turbomachinery,Wind Tunnel,Airfoil,Blade Design,Aerodynamics,Aerodynamic Design
Data di discussione della Tesi
21 Luglio 2022
URI

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