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Title: Fuel film thickness measurements using refractive index matching in a stratified-charge SI engine operated on E30 and alkylate fuels

Abstract

This paper shows fuel film measurements in a spark-ignited direct injection engine using refractive index matching (RIM). The RIM technique is applied to measure the fuel impingement of a high research octane number gasoline fuel with 30 vol% ethanol content at two intake pressures and coolant temperatures. Measurements are conducted for an alkylate fuel at one operating case, as well. It is shown that the fuel volume on the piston surface increases for lower intake pressure and lower coolant temperature and that the alkylate fuel shows very little spray impingement. The fuel films can be linked to increased soot emissions. A detailed description of the calibration technique is provided and measurement uncertainties are discussed. The dependency of the RIM signal on refractive index changes is measured. The RIM technique provides quantitative film thickness measurements up to 0.9 µm in this engine. Finally, for thicker films, semi-quantitative results of film thickness can be utilized to study the distribution of impinged fuel.

Authors:
ORCiD logo [1];  [2];  [2];  [3];  [4];  [1]
  1. Technische Univ. Darmstadt (Germany). Dept. of Reactive Flows and Measurement Technology (RSM)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  3. Sandia National Lab. (SNL-CA), Livermore, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States)
  4. Beijing Inst. of Technology (China). School of Mechanical Engineering
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States); Technische Univ. Darmstadt (Germany); Beijing Inst. of Technology (China)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); USDOE National Nuclear Security Administration (NNSA); German Research Foundation (DFG); China Scholarship Council (CSC)
OSTI Identifier:
1473928
Report Number(s):
SAND-2018-9957J
Journal ID: ISSN 0723-4864; 667784
Grant/Contract Number:  
NA0003525; 201506035029
Resource Type:
Accepted Manuscript
Journal Name:
Experiments in Fluids
Additional Journal Information:
Journal Volume: 59; Journal Issue: 3; Journal ID: ISSN 0723-4864
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Ding, Carl-Philipp, Sjöberg, Magnus, Vuilleumier, David, Reuss, David L., He, Xu, and Böhm, Benjamin. Fuel film thickness measurements using refractive index matching in a stratified-charge SI engine operated on E30 and alkylate fuels. United States: N. p., 2018. Web. doi:10.1007/s00348-018-2512-5.
Ding, Carl-Philipp, Sjöberg, Magnus, Vuilleumier, David, Reuss, David L., He, Xu, & Böhm, Benjamin. Fuel film thickness measurements using refractive index matching in a stratified-charge SI engine operated on E30 and alkylate fuels. United States. doi:10.1007/s00348-018-2512-5.
Ding, Carl-Philipp, Sjöberg, Magnus, Vuilleumier, David, Reuss, David L., He, Xu, and Böhm, Benjamin. Mon . "Fuel film thickness measurements using refractive index matching in a stratified-charge SI engine operated on E30 and alkylate fuels". United States. doi:10.1007/s00348-018-2512-5. https://www.osti.gov/servlets/purl/1473928.
@article{osti_1473928,
title = {Fuel film thickness measurements using refractive index matching in a stratified-charge SI engine operated on E30 and alkylate fuels},
author = {Ding, Carl-Philipp and Sjöberg, Magnus and Vuilleumier, David and Reuss, David L. and He, Xu and Böhm, Benjamin},
abstractNote = {This paper shows fuel film measurements in a spark-ignited direct injection engine using refractive index matching (RIM). The RIM technique is applied to measure the fuel impingement of a high research octane number gasoline fuel with 30 vol% ethanol content at two intake pressures and coolant temperatures. Measurements are conducted for an alkylate fuel at one operating case, as well. It is shown that the fuel volume on the piston surface increases for lower intake pressure and lower coolant temperature and that the alkylate fuel shows very little spray impingement. The fuel films can be linked to increased soot emissions. A detailed description of the calibration technique is provided and measurement uncertainties are discussed. The dependency of the RIM signal on refractive index changes is measured. The RIM technique provides quantitative film thickness measurements up to 0.9 µm in this engine. Finally, for thicker films, semi-quantitative results of film thickness can be utilized to study the distribution of impinged fuel.},
doi = {10.1007/s00348-018-2512-5},
journal = {Experiments in Fluids},
number = 3,
volume = 59,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 6 works
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Figures / Tables:

Fig. 1 Fig. 1: Example of the refractive index matching technique with a large illumination angle - α ≈ 30° (a) and an example with illumination from a small angle - α ≈ 5° (b), schematic of a rough surface with applied liquid volume and illumination, showing a simplified sketch of themore » scattering at the glass-liquid-air interface and the liquid flow from higher to lower levels as discussed in Section 4.2 (c)« less

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