Subsonic Jet Noise Source Location as a Function of Nozzle Geometry

2019 ◽  
Author(s):  
Nick P. Breen ◽  
Krishan K. Ahuja
Keyword(s):  
Noise Source ◽  
Jet Noise ◽  
Source Location ◽  
Nozzle Geometry ◽  
Subsonic Jet

Jet noise source location by cross-correlation of far field microphone signals

1975 ◽  
Author(s):  
S. PARTHASARATHY
Keyword(s):  
Cross Correlation ◽  
Noise Source ◽  
Jet Noise ◽  
Source Location ◽  
Far Field

scholarly journals Jet noise source location via nearfield‐farfield correlations

1980 ◽  
Vol 67 (S1) ◽  
pp. S4-S5 ◽  
Author(s):  
Ian R. McLean ◽  
Werner G. Richarz
Keyword(s):  
Noise Source ◽  
Jet Noise ◽  
Source Location

scholarly journals Jet noise source location via acoustic intensity

1985 ◽  
Vol 78 (S1) ◽  
pp. S26-S26
Author(s):  
Werner G. Richarz
Keyword(s):  
Noise Source ◽  
Jet Noise ◽  
Source Location ◽  
Acoustic Intensity

Limitations of Acoustic Beamforming for Accurate Jet Noise Source Location

2020 ◽  
Author(s):  
Nick P. Breen ◽  
Krishan K. Ahuja
Keyword(s):  
Noise Source ◽  
Jet Noise ◽  
Source Location

Noise source location and scaling of subsonic upper-surface blowing

2020 ◽  
Vol 19 (3-5) ◽  
pp. 191-206
Author(s):  
Trae L Jennette ◽  
Krish K Ahuja
Keyword(s):  
Strouhal Number ◽  
Noise Source ◽  
Low Frequency ◽  
Directivity Pattern ◽  
Source Location ◽  
Dipole Source ◽  
Frequency Noise ◽  
Noise Sources ◽  
Trailing Edge ◽  
Trailing Edge Noise

This paper deals with the topic of upper surface blowing noise. Using a model-scale rectangular nozzle of an aspect ratio of 10 and a sharp trailing edge, detailed noise contours were acquired with and without a subsonic jet blowing over a flat surface to determine the noise source location as a function of frequency. Additionally, velocity scaling of the upper surface blowing noise was carried out. It was found that the upper surface blowing increases the noise significantly. This is a result of both the trailing edge noise and turbulence downstream of the trailing edge, referred to as wake noise in the paper. It was found that low-frequency noise with a peak Strouhal number of 0.02 originates from the trailing edge whereas the high-frequency noise with the peak in the vicinity of Strouhal number of 0.2 originates near the nozzle exit. Low frequency (low Strouhal number) follows a velocity scaling corresponding to a dipole source where as the high Strouhal numbers as quadrupole sources. The culmination of these two effects is a cardioid-shaped directivity pattern. On the shielded side, the most dominant noise sources were at the trailing edge and in the near wake. The trailing edge mounting geometry also created anomalous acoustic diffraction indicating that not only is the geometry of the edge itself important, but also all geometry near the trailing edge.

Jet noise source measurements using PIV

1999 ◽  
Author(s):  
John Seiner ◽  
Larry Ukeiley ◽  
Michael Ponton
Keyword(s):  
Noise Source ◽  
Jet Noise
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