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An Analysis of Noise Reduction in Supersonic Jets by Fluid Insert Nozzles

Author:
Majety, Venkata Rajeshwar
Published:
[University Park, Pennsylvania] : Pennsylvania State University, 2018.
Physical Description:
1 electronic document
Additional Creators:
Morris, Philip John
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Restrictions on Access:
Open Access.
Summary:
The primary objective of this research is to analyze the noise reduction obtained with the use of fluid insert nozzles in heated supersonic jets. In this regard, the far-field pressure data of two types of nozzles (baseline and fluid inserts) are used to investigate and validate the spatiotemporal characteristics of the radiation field, and to determine the sound reduction obtained. Further, to gain a better understanding of the noise radiated, the polar correlation technique is used to determine the location and relative strengths of the noise sources. The results of this research can be summarized as follows: the fluid insert nozzles reduce the overall sound radiated by a maximum amount of 10 dB and 4 dB respectively in the downstream and upstream directions of the jet flow. The highest levels of sound are radiated in the downstream directions of the jet flow for all the nozzle cases. The greatest amount of noise reduction is obtained in the 60 azimuthal plane. Irrespective of the nozzle type, significant noise source strength is located within ten nozzle diameters downstream from the nozzle exit. As the frequency increases, the highest peak of the noise source strength distribution moves closer to the nozzle exit.
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Dissertation Note:
M.S. Pennsylvania State University 2018.
Technical Details:
The full text of the dissertation is available as an Adobe Acrobat .pdf file ; Adobe Acrobat Reader required to view the file.
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