3D LIF/Mie planar droplet s izing in IC engine sprays using single-droplet calibration data
(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)
- author
- Koegl, Matthias ; Mishra, Yogeshwar Nath LU ; Hofbeck, Bernhard ; Baderschneider, Kevin ; Huber, Franz J.T. ; Pracht, Jonas ; Berrocal, Edouard LU ; Will, Stefan and Zigan, Lars
- organization
- publishing date
- 2020
- 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}}, }