Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

3D LIF/Mie planar droplet s izing in IC engine sprays using single-droplet calibration data

Koegl, Matthias ; Mishra, Yogeshwar Nath LU ; Hofbeck, Bernhard ; Baderschneider, Kevin ; Huber, Franz J.T. ; Pracht, Jonas ; Berrocal, Edouard LU ; Will, Stefan and Zigan, Lars (2020) 14th International Conference on Liquid Atomization and Spray Systems, ICLASS 2018
Abstract

This paper reports on the quantitative 2D and 3D droplet sizing based on the LIF/Mie ratio in ethanol DISI (Direct Injection Spark Ignition) sprays, where the required calibration is performed using quantitative micro and macro LIF/Mie ratio imaging of individual microdroplets. The droplets are generated from a monodisperse droplet generator in a diameter range from 16 µm to 60 µm. First, the liquid LIF (laser-induced fluorescence) and Mie scattered light (Mie) intensity from the dye-doped ethanol droplet illuminated by the 532 nm laser sheet are simultaneously recorded using a microscopic and a macroscopic imaging objective. The light intensity of the LIF and Mie optical signals are evaluated as a function of droplet diameters (d). The... (More)

This paper reports on the quantitative 2D and 3D droplet sizing based on the LIF/Mie ratio in ethanol DISI (Direct Injection Spark Ignition) sprays, where the required calibration is performed using quantitative micro and macro LIF/Mie ratio imaging of individual microdroplets. The droplets are generated from a monodisperse droplet generator in a diameter range from 16 µm to 60 µm. First, the liquid LIF (laser-induced fluorescence) and Mie scattered light (Mie) intensity from the dye-doped ethanol droplet illuminated by the 532 nm laser sheet are simultaneously recorded using a microscopic and a macroscopic imaging objective. The light intensity of the LIF and Mie optical signals are evaluated as a function of droplet diameters (d). The LIF and Mie intensity is found in a good agreement with volumetric (d3) and surface (d2) dependencies, respectively. Both micro and macro LIF/Mie intensity ratio show a linear dependence on d. The deduced calibration curve showing a correlation between LIF/Mie intensity ratio and droplet diameter is then used for the calibration of LIF/Mie ratio for 3D droplet size (Sauter Mean Diameter: SMD) in sprays. For 3D sizing, two-phase SLIPI-(Structured Laser Illumination Planar Imaging) based droplet sizing is applied in combination with laser sheet scanning for probing the spray in several two-dimensional (2D) slices. These 2D layers are combined together to reconstruct a quantitative 3D map of droplet SMD. Droplet SMD in the spray is found in the range between 10 µm and 50 µm.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to conference
publication status
published
subject
keywords
Direct-injection spark ignition (DISI), Ethanol, Laser-induced fluorescence, Mie scattering, SLIPI
conference name
14th International Conference on Liquid Atomization and Spray Systems, ICLASS 2018
conference location
Chicago, United States
conference dates
2018-07-22 - 2018-07-26
external identifiers
  • scopus:85070331157
language
English
LU publication?
yes
id
aa7f64aa-2438-4a16-b473-b467bf7c9abb
date added to LUP
2020-12-28 14:29:49
date last changed
2022-04-26 22:52:47
@misc{aa7f64aa-2438-4a16-b473-b467bf7c9abb,
  abstract     = {{<p>This paper reports on the quantitative 2D and 3D droplet sizing based on the LIF/Mie ratio in ethanol DISI (Direct Injection Spark Ignition) sprays, where the required calibration is performed using quantitative micro and macro LIF/Mie ratio imaging of individual microdroplets. The droplets are generated from a monodisperse droplet generator in a diameter range from 16 µm to 60 µm. First, the liquid LIF (laser-induced fluorescence) and Mie scattered light (Mie) intensity from the dye-doped ethanol droplet illuminated by the 532 nm laser sheet are simultaneously recorded using a microscopic and a macroscopic imaging objective. The light intensity of the LIF and Mie optical signals are evaluated as a function of droplet diameters (d). The LIF and Mie intensity is found in a good agreement with volumetric (d<sup>3)</sup> and surface (d<sup>2)</sup> dependencies, respectively. Both micro and macro LIF/Mie intensity ratio show a linear dependence on d. The deduced calibration curve showing a correlation between LIF/Mie intensity ratio and droplet diameter is then used for the calibration of LIF/Mie ratio for 3D droplet size (Sauter Mean Diameter: SMD) in sprays. For 3D sizing, two-phase SLIPI-(Structured Laser Illumination Planar Imaging) based droplet sizing is applied in combination with laser sheet scanning for probing the spray in several two-dimensional (2D) slices. These 2D layers are combined together to reconstruct a quantitative 3D map of droplet SMD. Droplet SMD in the spray is found in the range between 10 µm and 50 µm.</p>}},
  author       = {{Koegl, Matthias and Mishra, Yogeshwar Nath and Hofbeck, Bernhard and Baderschneider, Kevin and Huber, Franz J.T. and Pracht, Jonas and Berrocal, Edouard and Will, Stefan and Zigan, Lars}},
  keywords     = {{Direct-injection spark ignition (DISI); Ethanol; Laser-induced fluorescence; Mie scattering; SLIPI}},
  language     = {{eng}},
  title        = {{3D LIF/Mie planar droplet s izing in IC engine sprays using single-droplet calibration data}},
  year         = {{2020}},
}