Aeroacoustics of Contoured and Solid Porous Conical Plug Nozzle Supersonic Jet Flows PDF Download
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Author:
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Category : Jets
Languages : en
Pages :
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Author:
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ISBN:
Category : Jets
Languages : en
Pages :
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Category :
Languages : en
Pages : 192
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Category :
Languages : en
Pages :
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Category :
Languages : en
Pages : 84
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Category : Aeronautics
Languages : en
Pages : 1126
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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722313289
Category :
Languages : en
Pages : 86
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A computational jet noise study of a short conical plug-nozzle (CPN) is presented. The CPN has an exit diameter of 45 mm and the geometrical configuration closely approximates that of an ideal contoured plug-nozzle having shockless flow at pressure ratio xi(sub d) = 3.62. The gasdynamics of the jet flows have been predicted using the CFD code, NPARC with k-epsilon turbulence model; these data are then used for noise computations based on the modified GE/MGB code. The study covers a range of pressure ratio, 2.0 less than or equal to xi less than or equal to 5.0. The agreement of the computational results with the available experimental data is favorable. The results indicate consistent noise reduction effectiveness of the CPN as compared to equivalent convergent, convergent-divergent and ideal contoured plug nozzles at all pressure ratios. At design pressure ratio, codes predict noise levels within 4.0 dB of the measurements; and at off-design pressure ratios, in general, within 5.0 dB except at very high frequencies when deviations up to 10 dB are noted. The shock formation mechanism in the CPN jet is noted to be basically different from those in the convergent and CD nozzle jets. Das, Indu S. and Khavaran, Abbas and Das, A. P. Glenn Research Center...
Author:
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Category : Government publications
Languages : en
Pages : 1092
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Category : Government reports announcements & index
Languages : en
Pages : 954
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ISBN:
Category : Government publications
Languages : en
Pages : 1094
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Category : Science
Languages : en
Pages : 1276
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