Journal ArticleDOI
The measurement of spinning acoustic modes generated in an axial flow fan
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TLDR
In this article, a method for the experimental determination of the rotating acoustic modes that may be generated, at the blade-passing frequencies, in the inlet duct of an axial fan or compressor is presented.About:
This article is published in Journal of Sound and Vibration.The article was published on 1969-09-01. It has received 33 citations till now. The article focuses on the topics: Mechanical fan & Directivity.read more
Citations
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Modal decomposition in ducts based on transfer function measurements between microphone pairs
TL;DR: In this paper, a new in-duct modal decomposition technique is described, which is valid independently of the signal type present in the duct and it separates the modes into incident and reflected parts.
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Rotating blades and aerodynamic sound
TL;DR: The history of research on rotating blade noise is reviewed in this paper, from early studies of propeller radiation to current work on aircraft-engine fans, with emphasis on fundamental aspects of aerodynamic sound generation by blades.
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Rotating Instability in an Annular Cascade: Detailed Analysis of the Instationary Flow Phenomena
TL;DR: In this article, the analysis results of combined near-field measurements with high-speed particle image velocimetry (PIV) and unsteady pressure sensors were used to give more physical insight into rotating instability in compressors.
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Experiments on an Axial Fan Stage: Time Resolved Analysis of Rotating Instability Modes
TL;DR: In this article, a spectral and modal analysis of axial rotor configurations was performed using a spectral decomposition based on cross-spectral matrices, and a time-resolved analysis based on a spatial Discrete Fourier Transform was applied to clarify the temporal characteristics of the RI modes and their potential interrelations.
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A review of rotating blade noise technology
TL;DR: In this article, the authors provide a general technical background for the problems of noise due to rotating blades and present a bibliography of some of the more recent work in the areas of rotor and propeller noise, compressor and fan noise, and duct acoustics.
References
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Journal ArticleDOI
Rotating pressure patterns in ducts: Their generation and transmission
TL;DR: In this paper, an approximate theory of waves in annular ducts gives a physical picture of sound waves in any duct mode; mode shapes and cut-off frequencies are predicted with sufficient accuracy for many purposes.