An Experimental Investigation of Supersonic Swirling Jets
Author : Andrew D. Cutler
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Page : pages
File Size : 24,84 MB
Release : 1993
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Author : Andrew D. Cutler
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Page : pages
File Size : 24,84 MB
Release : 1993
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Author : Jason E. Frank
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Page : pages
File Size : 38,15 MB
Release : 1994
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Author : Clive William Pope
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Page : pages
File Size : 32,15 MB
Release : 1968
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Author :
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Page : 109 pages
File Size : 36,42 MB
Release : 2008
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This dissertation presents the results of an experimental investigation and analysis of the supersonic rectangular over-expanded flow of single and two-phase flows. Recent interest in rectangular supersonic jets is motivated by the need to reduce plume length and acoustically excited structural loads in the exhaust system of high performance aircrafts. Semi-periodic shock structures form in the jet plumes of these vehicles during low speed flight at off design conditions. These shock cells affect the jet velocity and temperature decay as well as the jet spread rate and its acoustic field. The flow regimes and shock structure in the plume was characterized for jets in quiescent atmosphere at over-expanded conditions. Instantaneous and phase average schlieren/shadowgraph images of the internal flow and the jets are presented to show the over-expanded shock structure and jet spread rate at different nozzle pressure ratios ranged from 1.6 to 9.5. A high-pressure particle feeders have been constructed to steady feed the dispersed large particles and the seeding particle for LDA measurements at different particle loading rates. Schlieren pictures of the jets are presented to show the shock structure and jet spread rate. LDV measurements are presented for the jet flow field and the centerline velocity decay. The results indicate that the rectangular supersonic jet spread rate is greater along the minor axis and increases with the nozzle pressure ratio. The individual shock cell length, as well as, the total number of shock cells within the jet plume were found to increase with nozzle pressure ratio. In two-phase rectangular jets of gas and dispersed solid particles the shock strength was found to attenuate with increased particle loading. The design, construction and initial shakedown of the facility has been accomplished. The effort required to reach this stage has been greater than initially expected. Further more detailed data acquisitions and measurements will be accomplished in future studies.
Author : Stephen Andrew Arnette
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Page : 266 pages
File Size : 12,78 MB
Release : 1992
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Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 38 pages
File Size : 38,46 MB
Release : 2018-06-24
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ISBN : 9781721785902
Recent advancement in the molecular Rayleigh scattering based technique allowed for simultaneous measurement of velocity and density fluctuations with high sampling rates. The technique was used to investigate unheated high subsonic and supersonic fully expanded free jets in the Mach number range of 0.8 to 1.8. The difference between the Favre averaged and Reynolds averaged axial velocity and axial component of the turbulent kinetic energy is found to be small. Estimates based on the Morkovin's "Strong Reynolds Analogy" were found to provide lower values of turbulent density fluctuations than the measured data. Panda, J. and Seasholtz, R. G. Glenn Research Center NASA/TM-2005-213564, AIAA Paper 2005-0514, E-15009
Author : Johan Agrell
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Page : pages
File Size : 16,20 MB
Release : 1985
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Author : Robert Earl Wilson
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Page : 110 pages
File Size : 50,25 MB
Release : 1966
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Author : University of Toronto. Institute of Aerophysics
Publisher : Institute of Aerophysics, University of Toronto
Page : 19 pages
File Size : 20,53 MB
Release : 1956
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Page : 584 pages
File Size : 20,72 MB
Release : 1994
Category : Aeronautics
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