Spatial Spectra of Jet Turbulence Measured by Particle Image Velocimetry

Maja Wänström, William K. George, Knud Erik Meyer

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Abstract

The unique capabilities of particle image velocimetry (PIV) have been utilized together with two-point similarity theory to measure spatial spectra in a ‘homogenized’ fully-developed turbulence jet at relatively high Reynolds number (20,000). The theory developed by Ewing et al. [1] was found to be in excellent agreement with the data, and in fact key to the present application. Despite relatively poor spatial resolution of the scales of motion (up to 15 times the Kolmogorov microscale) and limited dynamic range due to progressive jet velocity decay, it was possible to produce highly accurate spectra over three decades. Key factors for these results are a very large ensemble of statistically independent realizations (N = 10,841) and a very large, composite eld of view (20 relevant integral length scales) which limited the effect of windowing on the spectra.
Original languageEnglish
Title of host publicationSpatial Spectra of Jet Turbulence Measured by Particle Image Velocimetry
Publication date2009
Publication statusPublished - 2009
Event8th International Symposium on Particle Image Velocimetry - Melbourne, Australia
Duration: 25 Aug 200928 Aug 2009
Conference number: 8

Conference

Conference8th International Symposium on Particle Image Velocimetry
Number8
CountryAustralia
CityMelbourne
Period25/08/200928/08/2009

Cite this

Wänström, M., George, W. K., & Meyer, K. E. (2009). Spatial Spectra of Jet Turbulence Measured by Particle Image Velocimetry. In Spatial Spectra of Jet Turbulence Measured by Particle Image Velocimetry