An experimental investigation of fuel spray vapor phase characterization
Drallmeier, James Arthur
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Permalink
https://hdl.handle.net/2142/23782
Description
Title
An experimental investigation of fuel spray vapor phase characterization
Author(s)
Drallmeier, James Arthur
Issue Date
1989
Department of Study
Engineering, Mechanical
Discipline
Engineering, Mechanical
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Language
eng
Abstract
An experimental study of an infrared laser extinction technique for measuring fuel vapor flux in evaporating liquid fuel sprays was conducted. The infrared laser extinction technique consists of three separate measurements: a visible light angular scattering measurement, a visible light line-of-sight extinction measurement and an infrared line-of-sight extinction measurement. Using this technique, vapor flux along with other spray parameters such as mean drop size and size distribution were measured for a pressure atomized, isooctane fuel spray.
Line-of-sight infrared extinction measurements were deconvoluted to obtain radial variations of vapor concentration. Peak vapor concentrations were measured at the spray center due to air entrainment effects. Based on the radial mass fraction and measured gas phase velocity profiles, the fuel vapor mass flux was calculated; most of the vapor flux was contained in the center of the spray at all axial locations. The fuel vapor mass flux was integrated over the spray area at each axial location to obtain fuel vapor mass flow rates.
Comparisons were made between the infrared laser extinction technique and a Phase/Doppler Particle Analyzer (P/DPA) in terms of several spray parameters including drop size, size distribution and, in particular, vapor flux. Size comparisons were conducted on a spatially resolved and line-of-sight basis. While the spatially resolved comparisons indicated similar trends, the angular scattering measurements consistently predicted Sauter mean diameter results $\sim$10 $\mu$m larger than those obtained from the P/DPA. Comparisons of measured total fuel vapor flow yielded differences of 7 to 40% between the P/DPA and infrared extinction technique.
A detailed error analysis was performed to determine the error sensitivities of the vapor concentration to the measured parameters as a function of spray radius. The vapor concentration was relatively insensitive to the measured drop size distribution due to the fact that the vapor absorption was the most dominant mode of extinction. The vapor concentration was most sensitive to the measurement of the infrared extinction ratio. An upper limit for the overall error in the vapor concentration measurement was estimated at 15% over the spray radius.
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