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A long-range laser velocimeter for the National Full-Scale Aerodynamics Complex: New developments and experimental applicationA long-range laser velocimeter (LV) developed for remote operation from within the flow fields of the large wind tunnels of the National Full-Scale Aerodynamics Complex is described. Emphasis is placed on recent improvements in optical hardware as well as recent additions to data acquisition and processing techniques. The system has been upgraded from a dual-beam, single-color LV with focal range to 10 m, to a dual-beam, two-color LV with focal range to 20 m. At the new extended measurement range (between 10 and 20 m), signals are photon-resolved, and a photon correlation technique is applied to acquire and process the LV signals. This technique permits recovery of the velocity probability distributions at a particular measurement location from which the mean components of velocity and the corresponding normal stress components of turbulence are obtained. The method used for data reduction is outlined in detail, and a discussion of measurement accuracy is made. To study the performance of the LV and verify the measurement accuracy, laboratory measurements were made in the flow field of a 10 cm-diameter, 30-m/sec axisymmetric jet. A discussion of the requirements and techniques used to seed the flow is made, and boundary-layer surveys of mean velocity and turbulence intensity of the streamwise component and the component normal to the surface are presented.
Document ID
19890016836
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Reinath, Michael S. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1989
Subject Category
Instrumentation And Photography
Report/Patent Number
NAS 1.15:101081
NASA-TM-101081
A-89070
Meeting Information
Meeting: International Congress on Instrumentation in Aerospace Facilities
Location: Gottingen
Country: Germany
Start Date: September 18, 1989
End Date: September 21, 1989
Accession Number
89N26207
Funding Number(s)
PROJECT: RTOP 505-61-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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