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High temperature skin friction measurementSkin friction measurement in the NASA Langley hypersonic propulsion facility is described. The sensor configuration utilized an existing balance, modified to provide thermal isolation and an increased standoff distance. For test run times of about 20 sec and ambient-air cooling of the test section and balance, the modified balance performed satisfactorily, even when it was subjected to acoustic and structural vibration. The balance is an inertially balanced closed-loop servo system where the current to a moving-coil motor needed to restore or null the output from the position sensor is a measure of the force or skin friction tending to displace the moving element. The accuracy of the sensor is directly affected by the position sensor in the feedback loop, in this case a linear-variable differential transformer which has proven to be influenced by temperature gradients.
Document ID
19900041251
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Tcheng, Ping
(NASA Langley Research Center Hampton, VA, United States)
Holmes, Harlan K.
(NASA Langley Research Center Hampton, VA, United States)
Supplee, Frank H., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Subject Category
Instrumentation And Photography
Accession Number
90A28306
Distribution Limits
Public
Copyright
Other

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