Noise Generated by Low Pressure Axial Fans
Yasutoshi Senoo,Yoshio Kodama +1 more
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TLDR
In this article, the authors experimentally examined the generation and decay of rotating noise and turbulent noise generated by axial flow fans by changing various factors, such as the suction pipe geometry, the location and the thickness of struts, and the combination of the number of impeller blades and struts.Abstract:
Noise generated by a fan consists of the rotating noise and the turbulent noise. These two kinds of noise have entirely different characters with respect to decay in an axisymmetric pipe. In this paper the generation and decay of these two kinds of noise are experimentally examined by changing various factors, such as the suction pipe geometry, the location and the thickness of struts, and the combination of the number of impeller blades and the number of struts. The rate of decay of the rotating noise is predictable and in most cases the noise quickly decreases in proportion to the distance from the rotor, providing that the number of impeller blades and the number of struts are properly chosen. Therefore, the noise observeda way from a low pressure axial flow fan is mostly the turbulent noise.read more
Citations
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Back-scattering correction and further extensions of amiet's trailing-edge noise model. Part 1: theory
Michel Roger,Stéphane Moreau +1 more
TL;DR: In this paper, a leading-edge backscattering correction is derived, based on the solution of an equivalent Schwarzschild problem, and added to the original formula to account for all the effects due to a limited chord length, and to infer the far-field radiation off the mid-span plane.
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Noise generated by low pressure axial flow fans, I: Modeling of the turbulent noise
Tohru Fukano,Y. Kodama,Y. Senoo +2 more
TL;DR: In this paper, a new analytical treatment is proposed for estimating the sound pressure level of turbulent noise radiated from low pressure axial flow fans, and a physical model which is very simple but reasonable is introduced to explain the turbulent noise generation originating from the vortex shedding from rotor blades.
Journal ArticleDOI
Noise generated by low pressure axial flow fans, III: Effects of rotational frequency, blade thickness and outer blade profile
TL;DR: In this article, the effects of the fan rotational frequency and blade thickness at the trailing edge are compared with the theoretical results and the agreement of the theoretical and experimental results is generally quite satisfactory.
Dissertation
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End-plate for noise-by-flow control in axial fans
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