An Investigation of Multiple Scattering in a Hollow-Cone Spray University of Illinois at Urbana-Champaign

Format:

Conference/Event

Author/Creator:

Powell, Joshua W., author.

Conference Name:

SAE World Congress & Exhibition (2007-04-16 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2007

Summary:

Laser diagnostics of fuel sprays are often hampered by multiple scattering effects. Planar laser-induced exciplex fluorescence (PLIEF) and Mie scattering images of a spray are presented, and the effects of multiple signal scattering are explored. A hollow-cone spray is cut in half with a spray cutter, and then imaged from either side. In one set, signal passes through the spray to the camera (back-cut images), and in the other set it does not (front-cut images), showing the effect of passing the signal through the spray to the camera. The cut spray is characterized with a phase Doppler anemometer (PDA) and Sauter Mean Diameter (SMD) is seen to range from 10-30 μm. Operational guidelines for using the cutter are presented. It was determined that a film forms on the cutter face 3-5 ms after the start of injection (ASOI) depending on the cutter temperature. Stripped droplets from this film increase droplet concentration and SMD in the center of the spray if the cutter is used improperly. Mie scattering and PLIEF images are used to return planar droplet sizing (PDS) results for the spray, and absolute SMD over the spray is returned from the images. As the signal passes through the spray it is diffused by the droplets. Peak SMD is seen to decrease 14-20%, and as the signal passes through the spray it is shifted radially outwards

Notes:

Vendor supplied data

Publisher Number:

2007-01-0648

Access Restriction:

Restricted for use by site license