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3D mapping of droplet Sauter mean diameter in sprays

Mishra, Yogeshwar Nath LU ; Koegl, Matthias ; Baderschneider, Kevin ; Hofbeck, Bernhard ; Berrocal, Edouard LU ; Conrad, Chris ; Will, Stefan and Zigan, Lars (2019) In Applied Optics 58(14). p.3775-3783
Abstract
In this study, we report on the three-dimensional (3D) characterization of a spray in terms of its droplet Sautermean diameter (SMD) using the laser-induced fluorescence (LIF)/Mie ratio technique. The spray structure isanalyzed for a multi-hole direct-injection spark ignition (DISI) injector. A calibration curve to convert theLIF/Mie ratio to droplet diameter is deduced using LIF/Mie imaging and analysis of single droplets generatedby a droplet generator. The DISI spray investigated here is optically sectioned by means of two-phase structuredlaser illumination planar imaging to suppress the intensity of multiple light scattering from LIF and Mie imagesprior to their ratio. A series of calibrated LIF/Mie ratio images of spray is then... (More)
In this study, we report on the three-dimensional (3D) characterization of a spray in terms of its droplet Sautermean diameter (SMD) using the laser-induced fluorescence (LIF)/Mie ratio technique. The spray structure isanalyzed for a multi-hole direct-injection spark ignition (DISI) injector. A calibration curve to convert theLIF/Mie ratio to droplet diameter is deduced using LIF/Mie imaging and analysis of single droplets generatedby a droplet generator. The DISI spray investigated here is optically sectioned by means of two-phase structuredlaser illumination planar imaging to suppress the intensity of multiple light scattering from LIF and Mie imagesprior to their ratio. A series of calibrated LIF/Mie ratio images of spray is then recorded at several depths along thezdirection following the light sheet scanning of the spray. The droplet SMD ranges from less than 5μmuptoamaximum of 50μm in single-shot images. The averaged SMD results (1–30μm) obtained by using the calibrationcurve from the droplet generator are compared with measurement results from phase-Doppler anemometry.Finally, a 3D map is reconstructed from the successive 2D layers generated from spray scanning. The resulting3D representation of the droplet SMD shows a non-symmetric spray structure produced by the studied multi-hole injector, which cannot be resolved by analyzing only one central plane. (Less)
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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Optics
volume
58
issue
14
pages
3775 - 3783
publisher
Optical Society of America
external identifiers
  • scopus:85065791077
  • pmid:31158190
ISSN
2155-3165
DOI
10.1364/AO.58.003775
language
English
LU publication?
yes
id
a85bb8b9-a399-4d4b-b7ae-7d56f56e1e01
date added to LUP
2019-05-21 16:43:08
date last changed
2022-04-26 00:00:05
@article{a85bb8b9-a399-4d4b-b7ae-7d56f56e1e01,
  abstract     = {{In this study, we report on the three-dimensional (3D) characterization of a spray in terms of its droplet Sautermean diameter (SMD) using the laser-induced fluorescence (LIF)/Mie ratio technique. The spray structure isanalyzed for a multi-hole direct-injection spark ignition (DISI) injector. A calibration curve to convert theLIF/Mie ratio to droplet diameter is deduced using LIF/Mie imaging and analysis of single droplets generatedby a droplet generator. The DISI spray investigated here is optically sectioned by means of two-phase structuredlaser illumination planar imaging to suppress the intensity of multiple light scattering from LIF and Mie imagesprior to their ratio. A series of calibrated LIF/Mie ratio images of spray is then recorded at several depths along thezdirection following the light sheet scanning of the spray. The droplet SMD ranges from less than 5μmuptoamaximum of 50μm in single-shot images. The averaged SMD results (1–30μm) obtained by using the calibrationcurve from the droplet generator are compared with measurement results from phase-Doppler anemometry.Finally, a 3D map is reconstructed from the successive 2D layers generated from spray scanning. The resulting3D representation of the droplet SMD shows a non-symmetric spray structure produced by the studied multi-hole injector, which cannot be resolved by analyzing only one central plane.}},
  author       = {{Mishra, Yogeshwar Nath and Koegl, Matthias and Baderschneider, Kevin and Hofbeck, Bernhard and Berrocal, Edouard and Conrad, Chris and Will, Stefan and Zigan, Lars}},
  issn         = {{2155-3165}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{14}},
  pages        = {{3775--3783}},
  publisher    = {{Optical Society of America}},
  series       = {{Applied Optics}},
  title        = {{3D mapping of droplet Sauter mean diameter in sprays}},
  url          = {{https://lup.lub.lu.se/search/files/85448125/AO_manuscript_submitted.pdf}},
  doi          = {{10.1364/AO.58.003775}},
  volume       = {{58}},
  year         = {{2019}},
}