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

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

doi:10.1007/s00348-019-2782-6

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

Journal Article · 29 July 2019 · Experiments in Fluids

DOI: https://doi.org/10.1007/s00348-019-2782-6 · OSTI ID:1570219

Zhou, Bo ^[1]; Ruggles, Adam J. ^[1]; Huang, Erxiong ^[1]; Frank, Jonathan H. ^[1]

Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility

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. In this paper, 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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Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1570219

Report Number(s):: SAND2019--9179J; 678228

Journal Information:: Experiments in Fluids, Journal Name: Experiments in Fluids Journal Issue: 8 Vol. 60; ISSN 0723-4864

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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