Wavelet-based algorithm for correction of beam-steering artefacts in turbulent flow imaging at elevated pressures
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. 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.
- Authors:
-
- Sandia National Lab. (SNL-CA), Livermore, CA (United States). Combustion Research Facility
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1570219
- Report Number(s):
- SAND2019-9179J
Journal ID: ISSN 0723-4864; 678228; TRN: US2001178
- Grant/Contract Number:
- AC04-94AL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Experiments in Fluids
- Additional Journal Information:
- Journal Volume: 60; Journal Issue: 8; Journal ID: ISSN 0723-4864
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION
Citation Formats
Zhou, Bo, Ruggles, Adam J., Huang, Erxiong, and Frank, Jonathan H. Wavelet-based algorithm for correction of beam-steering artefacts in turbulent flow imaging at elevated pressures. United States: N. p., 2019.
Web. doi:10.1007/s00348-019-2782-6.
Zhou, Bo, Ruggles, Adam J., Huang, Erxiong, & Frank, Jonathan H. Wavelet-based algorithm for correction of beam-steering artefacts in turbulent flow imaging at elevated pressures. United States. https://doi.org/10.1007/s00348-019-2782-6
Zhou, Bo, Ruggles, Adam J., Huang, Erxiong, and Frank, Jonathan H. Mon .
"Wavelet-based algorithm for correction of beam-steering artefacts in turbulent flow imaging at elevated pressures". United States. https://doi.org/10.1007/s00348-019-2782-6. https://www.osti.gov/servlets/purl/1570219.
@article{osti_1570219,
title = {Wavelet-based algorithm for correction of beam-steering artefacts in turbulent flow imaging at elevated pressures},
author = {Zhou, Bo and Ruggles, Adam J. and Huang, Erxiong and Frank, Jonathan H.},
abstractNote = {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.},
doi = {10.1007/s00348-019-2782-6},
journal = {Experiments in Fluids},
number = 8,
volume = 60,
place = {United States},
year = {2019},
month = {7}
}
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