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A comparison of measured and predicted test flow in an expansion tube with air and oxygen test gasesSimultaneous time-resolved measurements of temperature, density, pitot pressure, and wall pressure in both air and O2 test gases were obtained in the Langley pilot model expansion tube. These tests show nonequilibrium chemical and vibrational relaxation significantly affect the test-flow condition. The use of an electromagnetic device to preopen the secondary diaphragm before the arrival of the primary shock wave resulted in an improvement in the agreement between the measured pitot pressure and the value inferred from measured density and interface velocity. Boundary-layer splitter plates used to reduce the wall boundary layer show that this disagreement in the measured and inferred pitot pressures is not a result of boundary-layer effects.
Document ID
19760008322
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Aaggard, K. V. (NASA Langley Research Center Hampton, VA, United States)
Goad, W. K. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
December 1, 1975
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
L-10356
NASA-TN-D-8068
Accession Number
76N15410
Funding Number(s)
PROJECT: RTOP 176-24-31-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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