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Comparison of jet Mach number decay data with a correlation and jet spreading contours for a large variety of nozzlesSmall-scale circular, noncircular, single- and multi-element nozzles with flow areas as large as 122 sq cm were tested with cold airflow at exit Mach numbers from 0.28 to 1.15. The effects of multi-element nozzle shape and element spacing on jet Mach number decay were studied in an effort to reduce the noise caused by jet impingement on externally blown flap (EBF) STOL aircraft. The jet Mach number decay data are well represented by empirical relations. Jet spreading and Mach number decay contours are presented for all configurations tested.
Document ID
19770021143
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Groesbeck, D. E. (NASA Lewis Research Center Cleveland, OH, United States)
Huff, R. G. (NASA Lewis Research Center Cleveland, OH, United States)
Vonglahn, U. H. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
June 1, 1977
Subject Category
Aerodynamics
Report/Patent Number
E-8561
NASA-TN-D-8423
Report Number: E-8561
Report Number: NASA-TN-D-8423
Accession Number
77N28087
Funding Number(s)
PROJECT: RTOP 505-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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