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Noise generated by impingement of a jet upon a large flat board
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TLDR
In this paper, the authors measured the noise generated by an air jet impinging on a large flat board, where the board was large enough so that the flow leaving the edges of the board generated no significant noise.Abstract:
Data were obtained on the noise generated by an air jet impinging on a large flat board. The board was large enough so that the flow leaving the edges of the board generated no significant noise. The impingement angle, nozzle shape and size, jet velocity, and the distance from the nozzle to the board were varied in the experiment. Far-field noise data are presented. The nozzle-alone noise contribution to the total noise was generally small and was subtracted from the total, leaving the impingement-only noise. The impingement-only noise was adequately correlated by eighth power of the peak impingement velocity and first power of the impingement area. The spectral data were correlated by a Strouhal number based on the peak impingement velocity and a characteristic impingement diameter.read more
Citations
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Journal ArticleDOI
The sound‐producing oscillations of round underexpanded jets impinging on normal plates
TL;DR: In this article, the results of acoustical and optical experiments in which "moderately"" underexpanded sonic round jets impinge on flat plates normal to the jet axis are presented and analyzed.
Proceedings ArticleDOI
Jet noise from coaxial nozzles over a wide range of geometric and flow parameters
W. Olsen,R. Friedman +1 more
TL;DR: In this paper, free field pure jet noise data were taken for a large range of coaxial nozzle configurations and correlation of the data resulted in a simple procedure for estimating ambient temperature subsonic coaxial jet noise spectra over a wide range of geometric and flow parameters.
Proceedings ArticleDOI
The effect of nozzle inlet shape, lip thickness, and exit shape and size on subsonic jet noise
TL;DR: In this article, the authors took far field noise data for convergent nozzles of various shapes and sizes at subsonic velocities exceeding 400 feet per second and found that the total noise power generation was essentially the same for circular, slot, and plug nozzels of good aerodynamic shape.
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Wall jets created by single and twin high-pressure jet impingement
P Miller,Michael T. Wilson +1 more
TL;DR: In this paper, an extensive experimental investigation into the nature of the wall jets produced by single and twin normal jet impingement has been undertaken, where wall jet velocity profiles have been recorded up to 70 jet diameters from the point of impact, at pressures representative of current VStol technology.
Analysis of noise produced by jet impingement near the trailing edge of a flat and a curved plate
D. J. Mckinzie,R. J. Burns +1 more
TL;DR: In this article, sound fields produced by the interaction of a subsonic cold gas jet with the trailing edge of a large flat plate and a curved plate were analyzed to obtain a better understanding of the dominant noise source and the mechanism governing the peak sound pressure-level frequencies of the broadband spectra.
References
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Aerodynamic Noise and the Plane Boundary
TL;DR: In this article, the image principle is developed in a rigorous manner and the apparent paradox is resolved with the help of an extension of Lighthill's and Curle's analyses to include boundaries which are not wholly immersed in the noise generating flow.
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On the Aerodynamic Surface Sound from a Plane Turbulent Boundary Layer
TL;DR: In this paper, the authors investigated the properties of the generation of sound from a turbulent boundary layer and derived an integral theorem which relates the motion of a fluid about a body of arbitrary shape to the stress distribution over the surface.
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Blown flap noise research
TL;DR: In this paper, noise data with models of both internally and externally blown jet flaps designed for STOL aircraft was used to evaluate the performance of both internal and external blown flaps.