On the effect of Mach number on subsonic jet noise sources in the Goldstein acoustic analogy model

2013 ◽  
Author(s):  
Vasily G. Kondakov ◽  
Sergey A. Karabasov ◽  
Vasily Goloviznin
Keyword(s):  
Mach Number ◽  
Jet Noise ◽  
Acoustic Analogy ◽  
Noise Sources ◽  
Subsonic Jet

Mach Number Effects on Jet Noise Sources and Radiation to Shallow Angles

AIAA Journal ◽  
2006 ◽  
Vol 44 (8) ◽  
pp. 1915-1918 ◽  
Author(s):  
James I. Hileman ◽  
Mo Samimy
Keyword(s):  
Mach Number ◽  
Jet Noise ◽  
Noise Sources

scholarly journals Similarity scaling of jet noise sources for low-order jet noise modelling based on the Goldstein generalised acoustic analogy

2017 ◽  
Vol 16 (6) ◽  
pp. 476-490 ◽  
Author(s):  
Vasily A Semiletov ◽  
Sergey A Karabasov
Keyword(s):  
Jet Noise ◽  
Field Measurements ◽  
Noise Prediction ◽  
Far Field ◽  
Acoustic Analogy ◽  
Noise Sources ◽  
Modelling Framework ◽  
Noise Data ◽  
Field Noise ◽  
Low Order

As a first step towards a robust low-order modelling framework that is free from either calibration parameters based on the far-field noise data or any assumptions about the noise source structure, a new low-order noise prediction scheme is implemented. The scheme is based on the Goldstein generalised acoustic analogy and uses the Large Eddy Simulation database of fluctuating Reynolds stress fields from the CABARET MILES solution of Semiletov et al. corresponding to a static isothermal jet from the SILOET experiment for reconstruction of effective noise sources. The sources are scaled in accordance with the physics-based arguments and the corresponding sound meanflow propagation problem is solved using a frequency domain Green’s function method for each jet case. Results of the far-field noise predictions of the new method are validated for the two NASA SHJAR jet cases, sp07 and sp03 from and compared with the reference predictions, which are obtained by applying the Lighthill acoustic analogy scaling for the SILOET far-field measurements and using an empirical jet-noise prediction code, sJet.

EVALUATION OF SUBSONIC INFLOW TREATMENTS FOR UNSTEADY JET FLOW

1999 ◽  
Vol 07 (03) ◽  
pp. 147-160 ◽  
Author(s):  
REDA R. MANKBADI ◽  
AMR. A. ALI
Keyword(s):  
Mach Number ◽  
Unsteady Flow ◽  
Linear Approximation ◽  
Acoustic Field ◽  
Linear Prediction ◽  
Jet Noise ◽  
Validity Range ◽  
Radiated Sound ◽  
Unsteady Jet ◽  
Subsonic Jet

Linearized Euler simulations of the unsteady flow of a subsonic jet and its associated acoustic field are presented in this paper. Various subsonic inflow treatments are evaluated. Some of these treatments have been found to produce reflections at the inflow while others are reflection-free. Results are then presented for the effect of Mach number on the radiated sound. It is shown that as the Mach number increases the source becomes noncompact and the directivity is characterized by a well-defined peak. By comparing the linear prediction to the experimental results, validity range of linear approximation for subsonic jet noise is assessed.

Quantitative schlieren measurements in a supersonic turbulent jet

1972 ◽  
Vol 51 (3) ◽  
pp. 435-447 ◽  
Author(s):  
M. R. Davis
Keyword(s):  
Mach Number ◽  
Nozzle Exit ◽  
Density Fluctuations ◽  
Turbulent Jet ◽  
Initial Region ◽  
Potential Core ◽  
Single Beam ◽  
Schlieren System ◽  
The Difference ◽  
Subsonic Jet

This paper describes the results of a series of measurements made using a single beam schlieren system to investigate the density fluctuations present in the initial region of a supersonic axisymmetric turbulent jet with a Mach number of 1-82 in the flow a t the nozzle exit. A preheater was used to reduce the difference between the jet static temperature and that of the surrounding air to a relatively low level. The results show that significant density fluctuations are present in the potential core of the jet and that the distribution of fluctuating intensity across the shear layer differs from that obtained with a subsonic jet without preheating.

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