Quantifying fuel spray properties including penetration, cone angle, and vaporization processes sheds light on fuel-air mixing phenomenon which governs subsequent combustion and emissions formation in diesel engines. Accurate experimental determination of these spray properties is a challenge but imperative to validate computational fluid dynamic (CFD) models for combustion prediction. This study proposes a new threshold independent method for determination of spray cone angle when using Mie back-scattering optical diagnostics to visualize diesel sprays in an optically accessible constant volume vessel. Test conditions include the influence of charge density (17.6 and 34.9 kg/m3) at 1990 bar injection pressure, and the influence of injection pressure (990, 1370, and 1980 bar) at a charge density of 34.8 kg/m3 on diesel fuel spray formation from a multi-hole injector into nitrogen at a temperature of 100°C. Conventional thresholding to convert an image to black and white for processing and determination of cone angle is threshold subjective. As an alternative, an image processing method was developed which fits a Gaussian curve to the intensity distribution of the spray at radial spray cross-sections and uses the resulting parameters to define the spray edge and hence cone angle. This Gaussian curve fitting methodology is shown to provide a robust method for cone angle determination, accounting for reductions in intensity at the radial spray edge. Results are presented for non-vaporizing sprays using this Gaussian curve fitting method and compared to the conventional thresholding based method.
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ASME 2011 Internal Combustion Engine Division Fall Technical Conference
October 2–5, 2011
Morgantown, West Virginia, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-4442-7
PROCEEDINGS PAPER
Characterizing Diesel Fuel Spray Cone Angle From Back-Scattered Imaging by Fitting Gaussian Profiles to Radial Spray Intensity Distributions
Jaclyn E. Nesbitt,
Jaclyn E. Nesbitt
Michigan Technological University, Houghton, MI
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Jeffrey D. Naber,
Jeffrey D. Naber
Michigan Technological University, Houghton, MI
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Seong-Young Lee
Seong-Young Lee
Michigan Technological University, Houghton, MI
Search for other works by this author on:
Jaclyn E. Nesbitt
Michigan Technological University, Houghton, MI
Jeffrey D. Naber
Michigan Technological University, Houghton, MI
Seong-Young Lee
Michigan Technological University, Houghton, MI
Paper No:
ICEF2011-60034, pp. 349-360; 12 pages
Published Online:
February 3, 2012
Citation
Nesbitt, JE, Naber, JD, & Lee, S. "Characterizing Diesel Fuel Spray Cone Angle From Back-Scattered Imaging by Fitting Gaussian Profiles to Radial Spray Intensity Distributions." Proceedings of the ASME 2011 Internal Combustion Engine Division Fall Technical Conference. ASME 2011 Internal Combustion Engine Division Fall Technical Conference. Morgantown, West Virginia, USA. October 2–5, 2011. pp. 349-360. ASME. https://doi.org/10.1115/ICEF2011-60034
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