NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Experimental study of a free turbulent shear flow at Mach 19 with electron-beam and conventional probesAn experimental study of the initial development region of a hypersonic turbulent free mixing layer was made. Data were obtained at three stations downstream of a M = 19 nozzle over a Reynolds range of 1.3 million to 3.3 million per meter and at a total temperature of about 1670 K. In general, good agreement was obtained between electron-beam and conventional probe measurements of local mean flow parameters. Measurements of fluctuating density indicated that peak root-mean-square (rms) levels are higher in the turbulent free mixing layer than in boundary layers for Mach numbers less than 9. The intensity of rms density fluctuations in the free stream is similar in magnitude to pressure fluctuations in high Mach number flows. Spectrum analyses of the measured fluctuating density through the shear layer indicate significant fluctuation energy at the lower frequencies (0.2 to 5 kHZ) which correspond to large-scale disturbances in the high-velocity region of the shear layer.
Document ID
19750024313
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Harvey, W. P. (NASA Langley Research Center Hampton, VA, United States)
Hunter, W. D., Jr. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
October 1, 1975
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
L-10138
NASA-TN-D-7981
Accession Number
75N32386
Funding Number(s)
PROJECT: RTOP 505-06-41-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available