Open Access
Methods for reducing blade passing frequency noise generated by rotor-wake - stator interaction
TLDR
A theoretical model for the generation of blade-passage noise caused by the interaction of rotor wakes with the downstream stator blades in a fan stage has been compiled and a set of significant parameters has been identified to reduce this interaction-caused blade-Passage frequency noise.Abstract:
A theoretical model for the generation of blade-passage noise caused by the interaction of rotor wakes with the downstream stator blades in a fan stage has been compiled. This model has combined a description of the rotor wake based on existing experimental correlations with an existing theory for the response of the stator blades to those wakes. This model of the interaction-caused blade-passage noise has been used to examine some effects of blade geometry and flow conditions on the noise generated. A set of significant parameters has been identified to reduce this interaction-caused blade-passage frequency noise. A redesign of an existing fan with the use of these concepts has produced a theoretical noise reduction of more than 7 decibels.read more
Citations
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Proceedings ArticleDOI
Reduction of Wake-Stator Interaction Noise Using Passive Porosity
TL;DR: In this paper, a typical fan stator airfoil was subjected to the effects of a transversely moving wake; time histories of the primitive aerodynamic variables, obtained from computational Fluid Dynamics (CFD) solutions, were then input into an acoustic prediction code.
Dissertation
On the Use of Surface Porosity to Reduce Wake-Stator Interaction Noise
TL;DR: In this article, the authors present a survey of the work of the authors of this paper and their contributions to the development of this work. But they do not mention the authorship of the paper.
Journal ArticleDOI
An analytic solution for gust-cascade interaction noise including effects of realistic aerofoil geometry
Peter J. Baddoo,Lorna J. Ayton +1 more
TL;DR: In this article, an analytic solution for the sound generated by rotor-stator interaction for aerofoils with small camber and thickness subject to a background flow with small angle of attack is presented.
Journal ArticleDOI
Rotor wake characteristics relevant to rotor-stator interaction noise generation
TL;DR: In this article, mean and turbulence wake properties at three axial locations behind the rotor of an aerodynamically loaded 1.2 pressure ratio fan were measured using a stationary cross film anemometer in an anechoic wind tunnel.
Journal ArticleDOI
Implementation of air injection into the turbulent boundary layer of aircraft wing using external pressurized flow
TL;DR: In this article, the possibility of using the injection of air into the incompressible turbulent boundary layer of an axisymmetric wing through a finely perforated area provided on the wing surface was studied.
References
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Journal ArticleDOI
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Journal ArticleDOI
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TL;DR: In this article, various possible mechanisms of noise generation in axial flow fans are described, and the amplitude of this noise is strongly dependent on axial spacing between rows, and it appears that stator area may also be a significant parameter.
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TL;DR: An overview of axial flow compressors is presented in this article, where several topics such as compressor design, ptotential and viscous flow in two dimensional cascades, compressor stall and blade vibration, and compressor flow theory are also covered.
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