Polarization Ratio with Structured Laser Illumination Planar Imaging for Droplet Sizing in Flash Boiling Ammonia Spray
(2025) ILASS-Europe 2025- Abstract
- Liquid-phase ammonia, a carbon-free alternative fuel, is increasingly being considered for improving overall efficiency, reducing system complexity, and lowering costs across various thermal applications such as engines, gas turbines, and burners. However, the physical properties of ammonia are far from usual carbon-based fuels as it is prone to flash boiling upon injection. Therefore, experimental characterization of liquid ammonia sprays, specifically the spatial distribution of droplet sizes, is essential to improve the understanding of the evaporation process and its mixing with ambient air. However, flash boiling sprays severely suffer multiple scattering, limiting the use of investigatory optical techniques. Structured Laser... (More)
- Liquid-phase ammonia, a carbon-free alternative fuel, is increasingly being considered for improving overall efficiency, reducing system complexity, and lowering costs across various thermal applications such as engines, gas turbines, and burners. However, the physical properties of ammonia are far from usual carbon-based fuels as it is prone to flash boiling upon injection. Therefore, experimental characterization of liquid ammonia sprays, specifically the spatial distribution of droplet sizes, is essential to improve the understanding of the evaporation process and its mixing with ambient air. However, flash boiling sprays severely suffer multiple scattering, limiting the use of investigatory optical techniques. Structured Laser Illumination Planar Imaging (SLIPI) is an effective and widely accepted technique developed to supress such parasitic optical phenomena. Upon combination with
a novel Polarization Ratio technique, droplet sizing can be performed on these highly scattering flash boilingmevents. This manuscript presents a first attempt to measure droplet sizes, D21, across a flash-boiling ammonia spray injected into an optical vessel using a Spray G (Engine Combustion Network) multi-hole injector. While the conventional planar polarization Mie scattering imaging is highly affected by the detection of multiple light scattering, we show that the use of 2-phase SLIPI allows for an efficient suppression of these unwanted photons to obtain, to the best of the authors’ knowledge, a first reliable measurement of droplet sizes in flash boiling ammonia spray under such challenging conditions (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/b0a5c781-e851-4fd0-860f-0c5e86a72c9e
- author
- Sonawane, Utkarsha ; Garcia, Sebastien LU ; Kornienko, Vassily LU ; Hespel, Camille ; Rousselle, Christine and Berrocal, Edouard LU
- organization
- publishing date
- 2025-08-31
- type
- Contribution to conference
- publication status
- published
- subject
- conference name
- ILASS-Europe 2025
- conference location
- Lund, Sweden
- conference dates
- 2025-08-31 - 2025-09-04
- language
- English
- LU publication?
- yes
- id
- b0a5c781-e851-4fd0-860f-0c5e86a72c9e
- alternative location
- https://lu.app.box.com/s/wq7p1vfdjy2njl0z4e9ok6bwshkdglfm
- date added to LUP
- 2026-03-06 11:18:56
- date last changed
- 2026-03-06 12:09:26
@misc{b0a5c781-e851-4fd0-860f-0c5e86a72c9e,
abstract = {{Liquid-phase ammonia, a carbon-free alternative fuel, is increasingly being considered for improving overall efficiency, reducing system complexity, and lowering costs across various thermal applications such as engines, gas turbines, and burners. However, the physical properties of ammonia are far from usual carbon-based fuels as it is prone to flash boiling upon injection. Therefore, experimental characterization of liquid ammonia sprays, specifically the spatial distribution of droplet sizes, is essential to improve the understanding of the evaporation process and its mixing with ambient air. However, flash boiling sprays severely suffer multiple scattering, limiting the use of investigatory optical techniques. Structured Laser Illumination Planar Imaging (SLIPI) is an effective and widely accepted technique developed to supress such parasitic optical phenomena. Upon combination with<br/>a novel Polarization Ratio technique, droplet sizing can be performed on these highly scattering flash boilingmevents. This manuscript presents a first attempt to measure droplet sizes, D21, across a flash-boiling ammonia spray injected into an optical vessel using a Spray G (Engine Combustion Network) multi-hole injector. While the conventional planar polarization Mie scattering imaging is highly affected by the detection of multiple light scattering, we show that the use of 2-phase SLIPI allows for an efficient suppression of these unwanted photons to obtain, to the best of the authors’ knowledge, a first reliable measurement of droplet sizes in flash boiling ammonia spray under such challenging conditions}},
author = {{Sonawane, Utkarsha and Garcia, Sebastien and Kornienko, Vassily and Hespel, Camille and Rousselle, Christine and Berrocal, Edouard}},
language = {{eng}},
month = {{08}},
title = {{Polarization Ratio with Structured Laser Illumination Planar Imaging for Droplet Sizing in Flash Boiling Ammonia Spray}},
url = {{https://lu.app.box.com/s/wq7p1vfdjy2njl0z4e9ok6bwshkdglfm}},
year = {{2025}},
}