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Published in: Experiments in Fluids 8/2019

01-08-2019 | Letter

Wavelet-based algorithm for correction of beam-steering artefacts in turbulent flow imaging at elevated pressures

Authors: Bo Zhou, Adam J. Ruggles, Erxiong Huang, Jonathan H. Frank

Published in: Experiments in Fluids | Issue 8/2019

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Abstract

Beam steering by index-of-refraction gradients poses a significant challenge for laser-based imaging measurements in turbulent reacting and non-reacting flows, particularly at elevated pressures. High fidelity imaging and quantitative data interpretation in turbulent flows can be considerably impeded by artefacts generated from beam steering. A wavelet-based filtering scheme has been developed to recover the underlying turbulent flow structures from imaging measurements containing severe beam-steering artefacts. This analysis technique is equally applicable to imaging measurements in reacting and non-reacting flows. It is demonstrated using mixture fraction measurements in a transient turbulent jet flow at 8 bar using Rayleigh scattering imaging at a repetition rate of 100 kHz. The corrected images reveal the temporal evolution of flow structures with negligible residual beam-steering artefacts. Tests of the sensitivity of the wavelet-based filtering scheme to noise and spatial resolution indicate that it is a robust analytic tool for correcting severe beam-steering artefacts commonly encountered in laser-based imaging measurements at elevated pressures.

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Metadata
Title
Wavelet-based algorithm for correction of beam-steering artefacts in turbulent flow imaging at elevated pressures
Authors
Bo Zhou
Adam J. Ruggles
Erxiong Huang
Jonathan H. Frank
Publication date
01-08-2019
Publisher
Springer Berlin Heidelberg
Published in
Experiments in Fluids / Issue 8/2019
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI
https://doi.org/10.1007/s00348-019-2782-6

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