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

Abstract

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, lateralmore » plume core expansion to the probe sampling position. A modest air flow over the spray unit corrects these problems.« less

Authors:
Publication Date:
Research Org.:
ZWY Corp., Princeton Junction, NJ (USA)
OSTI Identifier:
6556056
Report Number(s):
AD-A-223033/2/XAB; ZYW-0001Z
CNN: F33615-89-C-2937
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Kelly, A J. Electrostatic fuel atomization and spray-dispersal demonstration. Final report, September 1989-January 1990. United States: N. p., 1990. Web.
Kelly, A J. Electrostatic fuel atomization and spray-dispersal demonstration. Final report, September 1989-January 1990. United States.
Kelly, A J. 1990. "Electrostatic fuel atomization and spray-dispersal demonstration. Final report, September 1989-January 1990". United States.
@article{osti_6556056,
title = {Electrostatic fuel atomization and spray-dispersal demonstration. Final report, September 1989-January 1990},
author = {Kelly, A J},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/6556056}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jul 01 00:00:00 EDT 1990},
month = {Sun Jul 01 00:00:00 EDT 1990}
}

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