Development of subminiature multi-sensor hot-wire probes
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Authors
Westphal, Russell V.
Ligrani, Phillip M.
Lemos, Fred R.
Subjects
Hot wire
Turbulence
Crossed wire
Boundary layer
Miniature
Turbulence
Crossed wire
Boundary layer
Miniature
Advisors
Date of Issue
1988-03
Date
Publisher
National Aeronautics and Space Administration (NASA)
Language
Abstract
Limitations on the spatial resolution of multi-sensor hot-wire probes have precluded accurate measurements of Reynolds stresses very near (Y+ < 100) solid surfaces in wind tunnels and in many practical aerodynamic flows. This report describes 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. 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 measurements in the near-wall region of turbulent boundary layers that are more accurate than conventional-sized probes. Results obtained also point out the important and subtle effects of turbulence anisotropy on measurements from conventional probes.
Type
Technical Report
Description
Series/Report No
Department
Organization
Ames Research Center
Identifiers
NPS Report Number
Sponsors
Funding
RTOP 505-60-31
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.