An investigation of multiple scattering in a hollow-cone spray

Joshua W. Powell, Chia-Fon Lee

Research output: Contribution to journalConference article

Abstract

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.

Original languageEnglish (US)
JournalSAE Technical Papers
DOIs
StatePublished - Jan 1 2007
Event2007 World Congress - Detroit, MI, United States
Duration: Apr 16 2007Apr 19 2007

Fingerprint

Multiple scattering
Cones
Scattering
Fluorescence
Cameras
Laser diagnostics
Lasers
Anemometers
Temperature

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

Cite this

An investigation of multiple scattering in a hollow-cone spray. / Powell, Joshua W.; Lee, Chia-Fon.

In: SAE Technical Papers, 01.01.2007.

Research output: Contribution to journalConference article

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AB - 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.

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