Experimental study of the properties of near-field and far-field jet noise

The near and far pressure fields generated by round, isothermal and cold jets of diameter D = 38 mm with Mach numbers varying over the range 0.6 � Mj � 1.6 are investigated experimentally, and characterized in terms of sound spectra and levels. Properties of near-field jet noise, obtained in particular at 7.5 diameters from the jet centerline, are documented. They differ appreciably from properties of far-field noise, and form a database that can be used for the validation of the acoustic fields determined by compressible Navier-Stokes computations. The near pressure fields originating from simulations can thus be directly compared, without resorting to extrapolation methods which might lead to uncertainties in the far pressure fields. In the present paper, sound sources localizations are also carried out from the near-field pressure signals. The experiments provide in addition far-field results evaluated at 52 diameters from the nozzle exit, in good agreement with the data of the literature. The classical dependence of jet noise features with the emission angle is observed. The level and frequency scalings of the pressure spectra obtained for subsonic jets in the sideline and downstream directions are also studied. For small radiation angles, the narrow-banded sound spectra measured are specially found to scale as the Strouhal number, whereas the one-third octave spectra seem to scale as the Helmholtz number, as previously shown by Zaman & Yu. 1

[1]  P. A. Lush,et al.  Measurements of subsonic jet noise and comparison with theory , 1971, Journal of Fluid Mechanics.

[2]  Meng Wang,et al.  COMPUTATIONAL PREDICTION OF FLOW-GENERATED SOUND , 2006 .

[3]  K. B. M. Q. Zaman.  Effect of initial condition on subsonic jet noise , 1985 .

[4]  James C. Yu,et al.  Noise field of a supersonic Mach 1.5 cold model jet. , 1972 .

[5]  Sébastien Barré,et al.  Computation of the noise radiated by jets with laminar/turbulent nozzle-exit conditions , 2006 .

[6]  Xavier Gloerfelt,et al.  Direct computation of the noise radiated by a subsonic cavity flow and application of integral methods , 2003 .

[7]  F. Farassat,et al.  An Analytical Comparison of the Acoustic Analogy and Kirchhoff Formulation for Moving Surfaces , 1997 .

[8]  A. J. Zuckerwar,et al.  Atmospheric absorption of sound: Further developments , 1995 .

[9]  A. Lyrintzis.  Surface Integral Methods in Computational Aeroacoustics—From the (CFD) Near-Field to the (Acoustic) Far-Field , 2003 .

[10]  Louis M. Handler,et al.  The role of instability waves in predicting jet noise , 2003, Journal of Fluid Mechanics.

[11]  Michael K. Ponton,et al.  On the near Field Pressure of a Transonic Axisymmetric Jet , 2004 .

[12]  Daniel Juvé,et al.  Reduction of hot supersonic jet noise by water injection , 1998 .

[13]  Satish Narayanan,et al.  High Subsonic Jet Experiments: Turbulence and Noise Generation Studies , 2002 .

[14]  M. Glauser,et al.  The proper orthogonal decomposition of pressure fluctuations surrounding a turbulent jet , 1997, Journal of Fluid Mechanics.

[15]  Anastasios S. Lyrintzis,et al.  Coupling of Integral Acoustics Methods with LES for Jet Noise Prediction , 2004 .

[16]  Khairul Q. Zaman,et al.  Flow field and near and far sound field of a subsonic jet , 1986 .

[17]  Richard Gaeta,et al.  Subtle Differences in Jet Noise Scaling with Narrow Band Spectra Compared to 1/3-Octave Band , 2003 .

[18]  Ganesh Raman,et al.  ADVANCES IN UNDERSTANDING SUPERSONIC JET SCREECH: REVIEW AND PERSPECTIVE , 1998 .

[19]  Christopher K. W. Tam,et al.  Jet Noise: Since 1952 , 1998 .

[20]  Lars-Erik Eriksson,et al.  Investigation of an Isothermal Mach 0.75 Jet and its Radiated sound Using Large-Eddy Simulation and Kirchhoff Surface Integration , 2005 .

[21]  Dennis K. McLaughlin,et al.  Flow field and acoustic properties of a Mach number 0·9 jet at a low Reynolds number , 1980 .

[22]  C. Bogey,et al.  Noise Investigation of a High Subsonic, Moderate Reynolds Number Jet Using a Compressible Large Eddy Simulation , 2003 .

[23]  Krishan K. Ahuja,et al.  An experimental study of subsonic jet noise and comparison with theory , 1973 .

[24]  Christophe Bailly,et al.  Investigation of downstream and sideline subsonic jet noise using Large Eddy Simulation , 2006 .

[25]  Peter Jordan,et al.  Final results from single point LDV measurements Project deliverable D3.4, JEAN (Jet Exhaust Aerodynamics and Noise) , 2004 .

[26]  Erik Mollo-Christensen,et al.  Experiments on jet flows and jet noise far-field spectra and directivity patterns , 1964, Journal of Fluid Mechanics.

[27]  D. K. Mclaughlin,et al.  Experiments on the flow and acoustic properties of a moderate-Reynolds-number supersonic jet , 1982, Journal of Fluid Mechanics.

[28]  Christopher K. W. Tam,et al.  SUPERSONIC JET NOISE , 1995 .

[29]  L. Sutherland,et al.  Atmospheric Absorption of Sound , 1972 .

[30]  K. Viswanathan.  Aeroacoustics of hot jets , 2002, Journal of Fluid Mechanics.

[31]  Harry E. Plumblee,et al.  The Generation and Radiation of Supersonic Jet Noise. Volume 2. Studies of Jet Noise, Turbulence Structure and Laser Velocimetry , 1976 .

[32]  Francois Vuillot,et al.  Investigation of Integral Surface Formulations for Acoustic Predictions of Hot Jets Starting from Unsteady Aerodynamic Simulations , 2003 .

[33]  Khairul Q. Zaman,et al.  Power spectral density of subsonic jet noise , 1985 .

[34]  Krishna Viswanathan,et al.  Jet Aeroacoustic Testing: Issues and Implications , 2003 .

[35]  Christophe Bailly,et al.  Investigation of sound sources in subsonic jets using causality methods on LES data , 2005 .

[36]  C. H. Liu,et al.  Supersonic jet noise generated by large scale instabilities , 1982 .

[37]  J. Seiner,et al.  On the Two Components of Turbulent Mixing Noise from Supersonic Jets , 1996 .

[38]  Henry E. Bass,et al.  Atmospheric absorption of sound: Update , 1990 .

[39]  Daniel Juvé,et al.  Reduction of jet noise by water injection , 1997 .

[40]  G. Elias.  Experimental techniques for source location , 1997 .

[41]  Y. Gervais,et al.  Coherent Structures in Subsonic Jets: A Quasi-Irrotational Source Mechanism? , 2006 .

[42]  H. K. Tanna,et al.  An experimental study of jet noise part I: Turbulent mixing noise , 1977 .