Plasma actuators are used to control far-field noise in Mach 1.65 jets from contoured and conical supersonic axisymmetric nozzles (henceforth, contoured and conical jets, respectively). The contoured nozzle is designed using the method of characteristics for a shock-free jet. The conical nozzle has converging and diverging conical sections with a sharp throat. Eight plasma actuators, distributed uniformly around the nozzle exit, are used and the jet is forced with azimuthal modes 0–3 and and forcing Strouhal numbers ranging from 0.09 to 4.0. The far-field acoustic noise is measured by a linear microphone array covering polar angles from 25 deg to 80 deg relative to the jet axis. In both jets, the lower forcing azimuthal modes ( and 1) are less effective than the higher modes (, 3, and ), which have similar levels of overall sound pressure level (OASPL) reduction. At shallow angles relative to the jet axis, the reduction in OASPL is about 1.6–1.8 dB at low forcing Strouhal numbers in both jets at the most effective forcing mode of . However, the OASPL in the sideline direction is only slightly increased (about 1 dB) for both the contoured and conical jets at . The reduction at shallow polar angles is related to the decrease in the peak mixing noise level in both jets. The range of forcing Strouhal numbers providing significant noise reduction and the range of polar angles over which the noise is reduced are both much larger in the conical jet compared with the contoured jet. The screech tones are also reduced or suppressed – most likely due to weakening of naturally occurring structures by forcing.
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August 2011
Research Papers
Far-Field Noise Control in Supersonic Jets From Conical and Contoured Nozzles
Jin-Hwa Kim,
Jin-Hwa Kim
Ohio State University
, Columbus, OH 43235
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Martin Kearney-Fischer,
Martin Kearney-Fischer
Ohio State University
, Columbus, OH 43235
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Sivaram Gogineni
Sivaram Gogineni
Spectral Energies, LLC
, Dayton, OH 45431
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Jin-Hwa Kim
Ohio State University
, Columbus, OH 43235
Martin Kearney-Fischer
Ohio State University
, Columbus, OH 43235
Mo Samimy
Sivaram Gogineni
Spectral Energies, LLC
, Dayton, OH 45431J. Eng. Gas Turbines Power. Aug 2011, 133(8): 081201 (9 pages)
Published Online: April 7, 2011
Article history
Revised:
June 1, 2010
Received:
June 1, 2010
Online:
April 7, 2011
Published:
April 7, 2011
Citation
Kim, J., Kearney-Fischer, M., Samimy, M., and Gogineni, S. (April 7, 2011). "Far-Field Noise Control in Supersonic Jets From Conical and Contoured Nozzles." ASME. J. Eng. Gas Turbines Power. August 2011; 133(8): 081201. https://doi.org/10.1115/1.4002811
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