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Development of subminiature multi-sensor hot-wire probesLimitations on the spatial resolution of multisensor hot wire probes have precluded accurate measurements of Reynolds stresses very near solid surfaces in wind tunnels and in many practical aerodynamic flows. The fabrication, calibration and qualification testing of very small single horizontal and X-array hot-wire probes which are intended to be used near solid boundaries in turbulent flows where length scales are particularly small, is described. Details of the sensor fabrication procedure are reported, along with information needed to successfully operate the probes. As compared with conventional probes, manufacture of the subminiature probes is more complex, requiring special equipment and careful handling. The subminiature probes tested were more fragile and shorter lived than conventional probes; they obeyed the same calibration laws but with slightly larger experimental uncertainty. In spite of these disadvantages, measurements of mean statistical quantities and spectra demonstrate the ability of the subminiature sensors to provide the measurements in the near wall region of turbulent boundary layers that are more accurate than conventional sized probes.
Document ID
19880012952
Document Type
Technical Memorandum (TM)
Authors
Westphal, Russell V. (NASA Ames Research Center Moffett Field, CA., United States)
Ligrani, Phillip M. (Naval Postgraduate School Monterey, Calif., United States)
Lemos, Fred R. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 5, 2013
Publication Date
March 1, 1988
Subject Category
INSTRUMENTATION AND PHOTOGRAPHY
Report/Patent Number
A-88045
NAS 1.15:100052
NASA-TM-100052
Funding Number(s)
PROJECT: RTOP 505-60-31
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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