Characteristics of intermittent fuel sprays

✍ Scribed by B. Jawad; E. Gulari; N.A. Henein

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 742 KB
• Volume: 88
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(92)90041-m

✦ Synopsis

The spray-tip penetrations and the drop sizes of intermittent fuel sprays were measured by using a modified pulsed optical spray sizer. The average spray tip speeds were determined from simultaneously recorded needle lift signals and obscuration traces. The speeds of a sequence of fuel pulses injected at -10 3 Hz were analyzed to elucidate penetration mechanisms. A correlation that relates penetration distance to time, pressure drop across the nozzle, fuel density, and ambient gas density was obtained. The temporal variations of drop size in penetrating pulses of sprays were measured. The concentration of drops were calculated by combining drop size and obscuration data. The Sauter mean diameter of penetrating fuel drops increased with an increase of the chamber pressure and decreased with an increase of the injection pressure.

EXPERIMENTAL APPARATUS AND PROCEDURE

The intermittent spray characteristics are investigated by using a pulsed Malvern optical analyzer, the operation of which is based on the analysis of Fraunhofer diffraction pattern formed by a laser