Internal Performance Characteristics of Vectored Axisymmetric Ejector Nozzles PDF Download
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Author: Milton Lamb
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Category :
Languages : en
Pages :
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Author: Milton Lamb
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Milton Lamb
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Category :
Languages : en
Pages : 232
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781724261922
Category :
Languages : en
Pages : 232
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A series of thrust-vectored axisymmetric ejector nozzles were designed and experimentally tested for internal performance and pumping characteristics at the Langley research center. This study indicated that discontinuities in the performance occurred at low primary nozzle pressure ratios and that these discontinuities were mitigated by decreasing expansion area ratio. The addition of secondary flow increased the performance of the nozzles. The mid-to-high range of secondary flow provided the most overall improvements, and the greatest improvements were seen for the largest ejector area ratio. Thrust vectoring the ejector nozzles caused a reduction in performance and discharge coefficient. With or without secondary flow, the vectored ejector nozzles produced thrust vector angles that were equivalent to or greater than the geometric turning angle. With or without secondary flow, spacing ratio (ejector passage symmetry) had little effect on performance (gross thrust ratio), discharge coefficient, or thrust vector angle. For the unvectored ejectors, a small amount of secondary flow was sufficient to reduce the pressure levels on the shroud to provide cooling, but for the vectored ejector nozzles, a larger amount of secondary air was required to reduce the pressure levels to provide cooling. Lamb, Milton Langley Research Center NASA-TM-4610, L-17386, NAS 1.15:4610 RTOP 505-59-30-04...
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Category : Aeronautics
Languages : en
Pages : 704
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Author: Laurence D. Leavitt
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Category : Jet planes
Languages : en
Pages : 28
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Category : Aeronautics
Languages : en
Pages : 176
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Author: George T. Carson
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Category : Airplanes
Languages : en
Pages : 84
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Category : Government publications
Languages : en
Pages : 1282
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Category : Government publications
Languages : en
Pages : 1638
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Author: Laurence D. Leavitt
Publisher:
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Category : Jet planes
Languages : en
Pages : 28
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