Characterization of simulated small-droplet fuel sprays

Conference · Wed Jan 01 00:00:00 EST 1986

OSTI ID:5390423

Ingebo, R D

A two-fluid pneumatic atomizer operating at relatively high liquid and gas pressures produced water sprays that simulated small-droplet clouds of liquid fuel for use in studying vaporization and fuel-air mixing effects on combustor performance and emissions. To characterize the sprays, a scattered-light scanning instrument was developed and measurements of volume median or volume mean diameter, D sub V.5, were correlated with D sub O, W sub w, and W sub n, i.e., orifice diameter, water, and nitrogen gas flow rates, respectively, to give the general expression: D sub v.5 approx. (D sub o sup 0.2) (W sub w sup m) (W sub n sup n), which yields D sub v.5 = 45 (D sub o sup 0.2) (W sub w sup 0.2) (W sub w sup - 1.2). Values of D sub o, W sub w, and W sub n are in centimeters and grams/second, respectively. Farther downstream at an axial distance of 6.7 cm, exponent m increased from 0.2 to 0.4 and exponent n decreased from -1.2 to -1.0 and at a distance of 25 cm downstream of the atomizer, n decreased to -0.8. The increase in exponent m and decrease in exponent n was attributed to a loss of very small droplets from the spray due primarily to vaporization and diffusion effects on clouds of small droplets traveling a distance of 25 cm.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• OSTI ID: 5390423
• Report Number(s): N-86-24961; NASA-TM-87286; E-2987; CONF-8606184-1
• Resource Relation: Conference: 22. joint propulsion conference, Huntsville, AL, USA, 16 Jun 1986
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
42 ENGINEERING
LIQUID FUELS
FUEL-AIR RATIO
SPRAYS
COMBUSTION CHAMBERS
DROPLETS
EVALUATION
EVAPORATION
EXPERIMENTAL DATA
FUEL SYSTEMS
MIXING
NUMERICAL SOLUTION
PARTICLE SIZE
SIMULATION
DATA
FUELS
INFORMATION
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PHASE TRANSFORMATIONS
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400800* - Combustion
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421000 - Engineering- Combustion Systems