Electrostatic fuel atomization and spray-dispersal demonstration. Final report, September 1989-January 1990

Technical Report · Sun Jul 01 00:00:00 EDT 1990

OSTI ID:6556056

Kelly, A J

The purpose of this work is to characterize charged spray plumes, test the validity of existing spray/plume models, provide a basis for evaluating these plumes for gas turbine fuel and ignitor systems service. Plumes generated by a charge injection atomizer in nitrogen (< or = bar, absolute) have been analyzed using an Aerometrics Phase Doppler Particle Analyzer (PDPA). A 10 bar the outer, small droplet sheath is characterized by a Sauter mean diameter (D32) of about 55 microns, a span of about 0.7 and a number median of about 20 microns. The inner, large droplet core is characterized by D32 about = 110 microns and the same span. These data conform to a predicted overall droplet size distribution exhibiting a polydispersed profile: primary peak at about 105 microns, and secondary peaks at about 85 and 135 microns. The peaks are associated with the core region; the near constant profile below about 85 microns is characteristic of the sheath. Contrary to prediction, D32 increased modestly with pressure in these tests due to two factors: output charge density levels remained fixed with increasing pressure due to shortening of the sprayer caused by droplets stagnating in the test chamber; and, the predictable, lateral plume core expansion to the probe sampling position. A modest air flow over the spray unit corrects these problems.

• Research Organization: ZWY Corp., Princeton Junction, NJ (USA)
• OSTI ID: 6556056
• Report Number(s): AD-A-223033/2/XAB; ZYW-0001Z; CNN: F33615-89-C-2937
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
FUEL INJECTION SYSTEMS
MATHEMATICAL MODELS
FUELS
ATOMIZATION
GAS TURBINES
AIR FLOW
DISTRIBUTION
DROPLETS
ELECTROSTATICS
IGNITION
PARTICLE SIZE
PARTICLE SIZE CLASSIFIERS
PRESSURE DEPENDENCE
PROGRESS REPORT
SPRAYS
DOCUMENT TYPES
EQUIPMENT
FLUID FLOW
FUEL SYSTEMS
GAS FLOW
MACHINERY
PARTICLES
SIZE
TURBINES
TURBOMACHINERY
330103* - Internal Combustion Engines- Turbine