Abstract
This review aims to assist aerodynamic noise in three industrial fields: Aerospace, Turbomachinery and Automotive. In this review the general terms in aeroacoustics is defined; and aerodynamic noise sources are recognized. The paper also reviews the brief literature on noise reduction techniques, with a particular focus on the state of the art numerical and experimental works. In Addition, developments in low speed designs for aerodynamic noise reduction, some passive and active methods for example serrated boundaries, porous media, noise absorber, and etc. are discussed. By investigating similarities in noise reduction techniques between these industries, this paper offers an outlook for noise reduction techniques in future.
Highlights
Sound is defined as Oscillation in pressure, stress, particle movement, particle velocity, etc., generated in a medium with internal forces and auditory sensation elicited by this oscillation [1]
Aeroacoustics is a branch of acoustic science that studies the production of noise by turbulent flow, the noise generated by the impact of aerodynamic forces on surfaces, and/or the noise generated by periodic change in flow
Understanding the physical mechanism of aerodynamic noise generation is an important step to reduce or control noise emissions. As it mentioned above the basic principles of aerodynamic noise prediction in infinite flow using acoustic analogs first obtained by LightHill [6]; Curl [17] extended mentioned studies by considering the presence of solid boundaries in the flow field
Summary
Sound is defined as Oscillation in pressure, stress, particle movement, particle velocity, etc., generated in a medium with internal forces (e.g., elastic or viscous) and auditory sensation elicited by this oscillation [1]. Todays many studies have been conducted by using the CFD and CAA tools in the field of the acoustic source mechanisms, noise prediction and aerodynamic noise reduction technologies, especially in aerospace engineering [4]. Understanding the physical mechanism of aerodynamic noise generation is an important step to reduce or control noise emissions As it mentioned above the basic principles of aerodynamic noise prediction in infinite flow using acoustic analogs first obtained by LightHill [6]; Curl [17] extended mentioned studies by considering the presence of solid boundaries in the flow field. The Ffowcs Williams-Hawkins formula derives from general form of LightHill acoustic analogy and it is able to calculate the noise produced by several acoustic sources In this method, several surfaces can be considered as the noise source and receiver. The main approach of authors in this review is the synergy of noise control technologies between different industries
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