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Analysis of the LIF/Mie ratio from individual droplets for planar droplet sizing : Application to gasoline fuels and their mixtures with ethanol

Koegl, Matthias ; Baderschneider, Kevin ; Bauer, Florian J. ; Hofbeck, Bernhard ; Berrocal, Edouard LU ; Will, Stefan and Zigan, Lars (2019) In Applied Sciences (Switzerland) 9(22).
Abstract

In this work, the possibility of using planar droplet sizing (PDS) based on laser-induced fluorescence (LIF) and Mie scattering was investigated within the framework of measuring the droplet Sauter mean diameter (SMD) of direct-injection spark-ignition (DISI) spray systems. For this purpose, LIF and Mie signals of monodisperse fuel droplets produced by a droplet generator were studied at engine relevant diameters (20-50 μm). The surrogate gasoline fuel Toliso (consisting of 65 vol. % isooctane, 35 vol. % toluene) and the biofuel blend E20 (consisting of 80 vol. % Toliso, 20 vol. % ethanol) were used and which were doped with the fluorescence dye "nile red". The effects of ethanol admixture, dye concentration, laser power, and... (More)

In this work, the possibility of using planar droplet sizing (PDS) based on laser-induced fluorescence (LIF) and Mie scattering was investigated within the framework of measuring the droplet Sauter mean diameter (SMD) of direct-injection spark-ignition (DISI) spray systems. For this purpose, LIF and Mie signals of monodisperse fuel droplets produced by a droplet generator were studied at engine relevant diameters (20-50 μm). The surrogate gasoline fuel Toliso (consisting of 65 vol. % isooctane, 35 vol. % toluene) and the biofuel blend E20 (consisting of 80 vol. % Toliso, 20 vol. % ethanol) were used and which were doped with the fluorescence dye "nile red". The effects of ethanol admixture, dye concentration, laser power, and temperature variation on the LIF/Mie ratio were studied simultaneously at both macroscopic and microscopic scale. The deduced calibration curves of the LIF and Mie signals of both fuels showed volumetric and surface dependent behaviors, respectively, in accordance with the assumptions in the literature. The existence of glare points and morphology-dependent resonances (MDRs) lead to slightly higher LIF and Mie exponents of E20 in comparison to Toliso. In principle, these calibration curves enable the determination of the SMD from LIF/Mie ratio images of transient fuel sprays.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ethanol, Gasoline, Laser-induced fluorescence, Mie scattering, Model fuel, Nile red
in
Applied Sciences (Switzerland)
volume
9
issue
22
article number
4900
publisher
Multidisciplinary Digital Publishing Institute (MDPI)
external identifiers
  • scopus:85075239486
DOI
10.3390/app9224900
language
English
LU publication?
yes
id
4356f651-a209-4743-bc53-457e1b63d4e8
date added to LUP
2019-12-06 11:07:05
date last changed
2020-01-13 02:34:47
@article{4356f651-a209-4743-bc53-457e1b63d4e8,
  abstract     = {<p>In this work, the possibility of using planar droplet sizing (PDS) based on laser-induced fluorescence (LIF) and Mie scattering was investigated within the framework of measuring the droplet Sauter mean diameter (SMD) of direct-injection spark-ignition (DISI) spray systems. For this purpose, LIF and Mie signals of monodisperse fuel droplets produced by a droplet generator were studied at engine relevant diameters (20-50 μm). The surrogate gasoline fuel Toliso (consisting of 65 vol. % isooctane, 35 vol. % toluene) and the biofuel blend E20 (consisting of 80 vol. % Toliso, 20 vol. % ethanol) were used and which were doped with the fluorescence dye "nile red". The effects of ethanol admixture, dye concentration, laser power, and temperature variation on the LIF/Mie ratio were studied simultaneously at both macroscopic and microscopic scale. The deduced calibration curves of the LIF and Mie signals of both fuels showed volumetric and surface dependent behaviors, respectively, in accordance with the assumptions in the literature. The existence of glare points and morphology-dependent resonances (MDRs) lead to slightly higher LIF and Mie exponents of E20 in comparison to Toliso. In principle, these calibration curves enable the determination of the SMD from LIF/Mie ratio images of transient fuel sprays.</p>},
  author       = {Koegl, Matthias and Baderschneider, Kevin and Bauer, Florian J. and Hofbeck, Bernhard and Berrocal, Edouard and Will, Stefan and Zigan, Lars},
  language     = {eng},
  month        = {11},
  number       = {22},
  publisher    = {Multidisciplinary Digital Publishing Institute (MDPI)},
  series       = {Applied Sciences (Switzerland)},
  title        = {Analysis of the LIF/Mie ratio from individual droplets for planar droplet sizing : Application to gasoline fuels and their mixtures with ethanol},
  url          = {http://dx.doi.org/10.3390/app9224900},
  doi          = {10.3390/app9224900},
  volume       = {9},
  year         = {2019},
}