A new technique for the measurement of Sauter mean diameter of droplets in unsteady dense sprays

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5378734

Kamimoto, T; Yokota, H; Kobayashi, H

A new technique is developed for the in-situ measurement of Sauter mean diameter of droplets in non-evaporating transient dense sprays. This method analyzes the image of a shadowpicture of a spray based on the incident light extinction principle, and allows the sizing of Sauter mean diameter of whole droplets in a transient spray with any shape. In addition, this method allows the measurement of the local droplet size in a quasi-steady region of an axisymmetric spray if the conservation equations regarding mass and momentum are included in the calculation and data analysis. A calibration was carried out using glass beads as test particles: this was proved to have an accuracy of Sauter mean diameter measurement within 10%, on average. Applications of the new technique to both diesel and gasoline (EFI) sprays have been made. The experimental results show that the rise in injection pressure contributes in the reduction of the overall Sauter mean diameter and that, in the peripheral region the droplets are smaller than those in the central region.

• OSTI ID: 5378734
• Report Number(s): CONF-890240--
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
DIMENSIONS
DROPLETS
ENGINES
FLUID MECHANICS
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
HEAT ENGINES
HYDRAULICS
INTERNAL COMBUSTION ENGINES
MEASURING METHODS
MECHANICS
PARTICLES
SPRAYS