scholarly journals Prediction of jet mixing noise with Lighthill's Acoustic Analogy and geometrical acoustics

2017 ◽  
Vol 141 (2) ◽  
pp. 1203-1213 ◽  
Author(s):  
Carlos R. S. Ilário ◽  
Mahdi Azarpeyvand ◽  
Victor Rosa ◽  
Rod H. Self ◽  
Júlio R. Meneghini
Keyword(s):  
Acoustic Analogy ◽  
Jet Mixing ◽  
Geometrical Acoustics ◽  
Mixing Noise

Prediction of Fine-scale Jet Mixing Noise Using Geometrical Acoustics

2019 ◽  
Author(s):  
Yann Martelet ◽  
Jean-Yves Suratteau ◽  
Grégoire Pont ◽  
Christophe Bailly
Keyword(s):  
Fine Scale ◽  
Jet Mixing ◽  
Geometrical Acoustics ◽  
Mixing Noise

Effects of forward flight on jet mixing noise from fine-scale turbulence

AIAA Journal ◽  
2001 ◽  
Vol 39 ◽  
pp. 1261-1269 ◽  
Author(s):  
Christopher K. W. Tam ◽  
Nikolai Pastouchenko ◽  
Laurent Auriault
Keyword(s):  
Fine Scale ◽  
Forward Flight ◽  
Jet Mixing ◽  
Mixing Noise ◽  
Scale Turbulence

The effects of forward flight on jet mixing noise from fine scale turbulence

2000 ◽  
Author(s):  
Christopher Tam ◽  
Nikolai Pastouchenko ◽  
Laurent Auriault
Keyword(s):  
Fine Scale ◽  
Forward Flight ◽  
Jet Mixing ◽  
Mixing Noise ◽  
Scale Turbulence

Prediction of jet mixing noise at high subsonic flight

1997 ◽  
Author(s):  
Kingo Yamamoto ◽  
Joseph Wat ◽  
Thomas Austin ◽  
Robert Golub ◽  
Kingo Yamamoto ◽  
...  
Keyword(s):  
Jet Mixing ◽  
Mixing Noise

Crackle - A dominant component of supersonic jet mixing noise

2000 ◽  
Author(s):  
A. Krothapalli ◽  
L. Venkatakrishnan ◽  
L. Lourenco
Keyword(s):  
Supersonic Jet ◽  
Jet Mixing ◽  
Dominant Component ◽  
Mixing Noise

Acoustic analysis of starting jets in an anechoic chamber

2020 ◽  
Author(s):  
Jörn Lothar Sesterhenn ◽  
Juan Jose Peña Fernández ◽  
Valeria Cigala ◽  
Ulrich Küppers ◽  
Don Dingwell
Keyword(s):  
Acoustic Analysis ◽  
Pressure Ratio ◽  
Maximum Velocity ◽  
Volcanic Eruptions ◽  
Anechoic Chamber ◽  
Nozzle Geometry ◽  
Jet Mixing ◽  
Frequency Space ◽  
Time Frequency ◽  
Mixing Noise

<p>Explosive volcanic eruptions emanate complex acoustic signals. They<br>are influenced by several parameters, most of most of which are highly<br>unconstrained in volcanic setting.</p><p>We investigate the acoustics of starting jets analogous to<br>volcanic jets at high Mach numbers and with different nozzle<br>geometries, in a controlled environment. For the first time in<br>volcanic analog studies, an anechoic chamber is used to eliminate<br>contamination of the signals by reflections from any wall or<br>obstacle.  The analysis concentrates on the identification of the<br>principal jet noise components including: compression waves, vortex<br>ring noise, turbulent jet mixing noise,  broadband shock noise and<br>screech. We employed a shock tube apparatus and signals were recorded<br>using a microphone array.  Employing wavelet analysis, we have<br>identified the noise sources in both time- and frequency-space.</p><p>We have identified the principal sound sources of the jet in<br>time-frequency space and have analyzed their behaviour with respect to<br>changes in pressure ratio $p/p_\infty$ ,non-dimensional mass supply<br>L/D and exit-to-throat area ratio.</p><p>We find that at higher pressure ratios the peak frequency of the<br>broadband shock noise is noticeably lower whereas the amplitude is<br>higher. The non-dimensional mass supply controls whether a jet forms<br>and its blowing duration and maximum velocity. The nozzle geometry has<br>a markable effect on delay of the shock-shear layer-vortex ring<br>interaction with respect to the compression wave.</p><p>Changes in parameters of the starting jet leave a clear and<br>interpretable trace in the observed sound pattern. This quantitative<br>parametrisation of these effects is essential for utilizing these<br>findings as well as field observations for the solution of the inverse<br>problem in the lab and in nature.</p><p> </p>

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