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Turbulence spectra from individual realization laser velocimetry data

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Abstract

Two techniques — a modified correlation method and a direct transform method — have been evaluated for use in making spectral estimates from randomly-sampled random data (such as turbulence data obtained with an individual realization laser Doppler velocimeter (LDV)). The effect of “bad” points (which usually appear randomly in actual LDV data sets) on the spectral estimates has been studied. Necessary modifications and extensions to the techniques have been determined based on studies using simulated data with known spectral characteristics. The direct transform method is found to have certain advantages over the correlation method.

From the LDV measurements taken in a simulated coal-fired magnetohydrodynamic flow field, major differences in turbulence spectra obtained from the two methods are observed in the region immediately downstream of the combustor where the flow was evidently dominated by (uncorrelated) combustion instabilities. Spectra are reported for three axial positions, and comparisons with classic turbulent pipe flow data are presented.

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Authors and Affiliations

  1. MHD Energy Center and Mechanical and Nuclear Engineering Department, Mississippi State University, 39762, Mississippi State, Miss., USA

    D. V. Srikantaiah & H. W. Coleman

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  1. D. V. Srikantaiah
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  2. H. W. Coleman
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Srikantaiah, D.V., Coleman, H.W. Turbulence spectra from individual realization laser velocimetry data. Experiments in Fluids 3, 35–44 (1985). https://doi.org/10.1007/BF00285269

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  • DOI: https://doi.org/10.1007/BF00285269

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