Nozzle design effects of dense spray region characteristics
- National Bureau of Standards, Washington, DC (United States)
- Maryland Univ., College Park, MD (United States). Dept. of Mechanical Engineering
Past investigations have revealed that nozzle design and fabrication influence significantly the structure and dynamics of fuel sprays, viz., spatial distribution of droplet size, number density, and velocity, as well as size and velocity distributions. Fuel spray nozzles used in many practical applications are of the pressure-jet or air-assist type. Studies carried out with these nozzles have generally provided spatially resolved information in non-dense regions of the spray, i.e., at axial positions downstream of approximately 20 mm. Measurements closer to the nozzle, where number concentrations exceed 10{sup 6} particles/cc, are more difficult because of problems associated with applying available particle sizing techniques (i.e., single particle counters and laser diffraction devices) to this region. The results presented are from an ongoing investigation to characterize pressure-atomized and air-assisted sprays. Spatial profiles of droplet mean size, number density and velocity have been reported in the past, with recent attention given to the droplet velocity distributions. The study has focused on the dense region of the spray immediately downstream of the nozzle exit. This region is of particular interest since it provides information on the initial structure and dynamics of the spray, without being perturbed by the surrounding aerodynamic pattern. This information can be used used to furnish data for spray modeling efforts. 7 refs.
- Research Organization:
- National Bureau of Standards, Washington, DC (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AI01-86CE90213
- OSTI ID:
- 10155899
- Report Number(s):
- CONF-8905401--1; ON: DE92015585
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330100
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800
42 ENGINEERING
421000
AIR
ATOMIZATION
COMBUSTION
COMBUSTION SYSTEMS
COMBUSTION, PYROLYSIS, AND HIGH-TEMPERATURE CHEMISTRY
DENSITY
DROPLETS
INTERNAL COMBUSTION ENGINES
LIQUID FUELS
NOZZLES
SPRAYS
VELOCITY