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Pilot model expansion tunnel test flow properties obtained from velocity, pressure, and probe measurementsVelocity-profile, pitot-pressure, and supplemental probe measurements were made at the nozzle exist of an expansion tunnel (a modification to the Langley pilot model expansion tube) for a nozzle net condition of a nitrogen test sample with a velocity of 4.5 km/sec and a density 0.005 times the density of nitrogen at standard conditions, both with the nozzle initially immersed in a helium atmosphere and with the nozzle initially evacuated. The purpose of the report is to present the results of these measurements and some of the physical properties of the nitrogen test sample which can be inferred from the measured results. The main conclusions reached are that: the velocity profiles differ for two nozzle conditions; regions of the flow field can be found where the velocity is uniform to within 5 percent and constant for several hundred microseconds; the velocity of the nitrogen test sample is reduced due to passage through the nozzle; and the velocity profiles do not significantly reflect the large variations which occur in the inferred density profiles.
Document ID
19730024449
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Friesen, W. J.
(NASA Langley Research Center Hampton, VA, United States)
Moore, J. A.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 2, 2013
Publication Date
November 1, 1973
Subject Category
Fluid Mechanics
Report/Patent Number
L-8846
NASA-TN-D-7310
Accession Number
73N33182
Funding Number(s)
PROJECT: RTOP 502-27-02-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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