An experimental investigation of fuel-spray vapor-phase characterization

Miscellaneous · Sun Jan 01 00:00:00 EST 1989

OSTI ID:5759118

Drallmeier, J A

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, 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. 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, vapor flux. The angular scattering measurements consistently predicted Sauter mean diameter results {approx}10 {mu}m larger than those obtained from the P/DPA. Comparisons of measured total fuel vapor flow yielded differences of 7 to 40%. 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. 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.

• Research Organization: Illinois Univ., Urbana, IL (USA)
• OSTI ID: 5759118
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
OCTANE
COMBUSTION KINETICS
ATOMIZATION
COMPARATIVE EVALUATIONS
DATA ANALYSIS
DISTRIBUTION
DROPLETS
ERRORS
EVAPORATION
FLOW RATE
INFRARED RADIATION
INHIBITION
LASERS
LIQUID FUELS
MASS TRANSFER
MEASURING INSTRUMENTS
PARTICLE SIZE
PHASE STUDIES
QUANTITY RATIO
SCATTERING
SPRAYS
VISIBLE RADIATION
ALKANES
CHEMICAL REACTION KINETICS
ELECTROMAGNETIC RADIATION
FUELS
HYDROCARBONS
KINETICS
ORGANIC COMPOUNDS
PARTICLES
PHASE TRANSFORMATIONS
RADIATIONS
REACTION KINETICS
SIZE
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry
025000 - Petroleum- Combustion