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Hot-wire accuracy in supersonic turbulence from comparisons with laser-induced fluorescenceA hot-wire anemometer and a new, nonintrusive, laser-induced fluorescence (LIF) technique are used to survey a turbulent boundary layer in a supersonic channel flow at Mach no. 2.06. The purpose is to test the accuracy of using the hot wire to measure the fluctuation amplitudes of static temperature and density in a compressible turbulent flow by comparing the results with independent and direct LIF measurements. Several methods of hot-wire calibration and analysis are applied. With each method, the hot-wire response can be related primarily to fluctuations of mass flux and total temperature, from which fluctuations of static temperature and density are calculated. However, these calculations are shown to be valid only if the fluctuations in static pressure are negligible. The acquisition and the analysis of the hot-wire data are often simplified further by neglecting the effects of fluctuations in total temperature. Comparisons of the fluctuation amplitudes of temperature and density obtained by hot-wire and LIF measurements demonstrate that such assumptions might not always be warranted, even in apparently simple flows.
Document ID
19880055790
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Logan, Pamela
(Stanford Univ. CA, United States)
Bershader, Daniel
(Stanford University CA, United States)
Mckenzie, Robert L.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 13, 2013
Publication Date
March 1, 1988
Publication Information
Publication: AIAA Journal
Volume: 26
ISSN: 0001-1452
Subject Category
Instrumentation And Photography
Accession Number
88A43017
Distribution Limits
Public
Copyright
Other

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