Detail publikace

Effervescent Atomizer - Study of Spray Structure Using PIV - PLIF Technique

Originální název

Effervescent Atomizer - Study of Spray Structure Using PIV - PLIF Technique

Anglický název

Effervescent Atomizer - Study of Spray Structure Using PIV - PLIF Technique

Jazyk

en

Originální abstrakt

Planar Laser-Induced-Fluorescence and stereoscopic Particle Image Velocimetry are employed to study an effervescent atomizer generated spray. Double pulsed laser provides two pulses of 265 nm radiation. The pulses are converted to a light sheet illuminating the spray in a cross section perpendicular to the spray axis. Natural fluorescence of the light heating oil is used for measurement of instant liquid phase concentration. Simultaneous 3D velocity field is calculated using the image pairs of liquid conc. Combination of the velocity and the conc. image leads to instant planar liquid mass flux. Set of 256 image pairs is used to calculate time averaged image of the liquid conc. and mass flux. Space-resolved RMS fluctuations of both the values from average local value normalized by the local time-average value characterize space-resolved spray unsteadiness. The spatial distribution of both the liquid conc. and mass flux is similar; the spray is axially symmetrical with maximum of time-average mass flux (conc.) in spray axis. Radial profiles of the norm. RMS fluctuations of the mass flux (conc.) distribution show low value near the spray axis, increase with increasing radial distance and maximum close to the spray edge. Radial profiles of the mean values and mainly of the fluctuations of the mass flux (conc.) vary with change of atomizer operation conditions.

Anglický abstrakt

Planar Laser-Induced-Fluorescence and stereoscopic Particle Image Velocimetry are employed to study an effervescent atomizer generated spray. Double pulsed laser provides two pulses of 265 nm radiation. The pulses are converted to a light sheet illuminating the spray in a cross section perpendicular to the spray axis. Natural fluorescence of the light heating oil is used for measurement of instant liquid phase concentration. Simultaneous 3D velocity field is calculated using the image pairs of liquid conc. Combination of the velocity and the conc. image leads to instant planar liquid mass flux. Set of 256 image pairs is used to calculate time averaged image of the liquid conc. and mass flux. Space-resolved RMS fluctuations of both the values from average local value normalized by the local time-average value characterize space-resolved spray unsteadiness. The spatial distribution of both the liquid conc. and mass flux is similar; the spray is axially symmetrical with maximum of time-average mass flux (conc.) in spray axis. Radial profiles of the norm. RMS fluctuations of the mass flux (conc.) distribution show low value near the spray axis, increase with increasing radial distance and maximum close to the spray edge. Radial profiles of the mean values and mainly of the fluctuations of the mass flux (conc.) vary with change of atomizer operation conditions.

BibTex


@inproceedings{BUT23869,
  author="Jan {Jedelský} and Miroslav {Jícha} and Michael {Landsmann}",
  title="Effervescent Atomizer - Study of Spray Structure Using PIV - PLIF Technique",
  annote="Planar Laser-Induced-Fluorescence and stereoscopic Particle Image Velocimetry are employed to study an effervescent atomizer generated spray. Double pulsed laser provides two pulses of 265 nm radiation. The pulses are converted to a light sheet illuminating the spray in a cross section perpendicular to the spray axis. Natural fluorescence of the light heating oil is used for measurement of instant liquid phase concentration. Simultaneous 3D velocity field is calculated using the image pairs of liquid conc. Combination of the velocity and the conc. image leads to instant planar liquid mass flux. Set of 256 image pairs is used to calculate time averaged image of the liquid conc. and mass flux. Space-resolved RMS fluctuations of both the values from average local value normalized by the local time-average value characterize space-resolved spray unsteadiness. The spatial distribution of both the liquid conc. and mass flux is similar; the spray is axially symmetrical with maximum of time-average mass flux (conc.) in spray axis. Radial profiles of the norm. RMS fluctuations of the mass flux (conc.) distribution show low value near the spray axis, increase with increasing radial distance and maximum close to the spray edge. Radial profiles of the mean values and mainly of the fluctuations of the mass flux (conc.) vary with change of atomizer operation conditions.",
  address="Faculty of Engineering, University "La Sapienza", Rome, Italy",
  booktitle="The seventh International Symposium PIV 2007",
  chapter="23869",
  institution="Faculty of Engineering, University "La Sapienza", Rome, Italy",
  year="2007",
  month="september",
  pages="1--9",
  publisher="Faculty of Engineering, University "La Sapienza", Rome, Italy",
  type="conference paper"
}