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Vortex pairing aeroacoustics in assymetric wakes

Grant number: 12/19810-0
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): January 01, 2013
Effective date (End): December 31, 2013
Field of knowledge:Engineering - Aerospace Engineering - Aerodynamics
Principal Investigator:Marcello Augusto Faraco de Medeiros
Grantee:Marlon Sproesser Mathias
Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

The purpose of this study is to analyze the aeroacustics of asymmetric wakes. Such flow is composed by the combination of a symmetric wake and a shear flow. It can be found downstream from airfoils generating lift or from tubes close to a wall, for example. The flow evolution is computed by direct numeric simulation, in which controlled perturbations are induced, allowing the behavior of the flow to be calculated for various frequencies. Asymmetric vortex are formed and paired, both the formation and pairing generate sound. Due to the asymmetry, the sound propagates in a different manner for every direction. Studying the factors that influence in this distributions allows a better understanding of the aeroacustics of more complex bodies. In the future, such knowledge might be used in the engineering of quieter aircraft, fulfilling stricter environmental requirements.