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Correcting For Seed-Particle Lag In LV MeasurementsTwo experiments conducted to evaluate effects of sizes of seed particles on errors in LV measurements of mean flows. Both theoretical and conventional experimental methods used to evaluate errors. First experiment focused on measurement of decelerating stagnation streamline of low-speed flow around circular cylinder with two-dimensional afterbody. Second performed in transonic flow and involved measurement of decelerating stagnation streamline of hemisphere with cylindrical afterbody. Concluded, mean-quantity LV measurements subject to large errors directly attributable to sizes of particles. Predictions of particle-response theory showed good agreement with experimental results, indicating velocity-error-correction technique used in study viable for increasing accuracy of laser velocimetry measurements. Technique simple and useful in any research facility in which flow velocities measured.
Document ID
19940000411
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Jones, Gregory S.
(NASA Langley Research Center, Hampton, VA.)
Gartrell, Luther R.
(NASA Langley Research Center, Hampton, VA.)
Kamemoto, Derek Y.
(George Washington Univ.)
Date Acquired
August 16, 2013
Publication Date
July 1, 1994
Publication Information
Publication: Laser Tech. Brief.
Volume: 2
Issue: 3
Subject Category
Mechanics
Report/Patent Number
LAR-14497
Accession Number
94B10411
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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