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Atomization and Sprays

Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

Institutional price:	$787.00
Issues per year:	8

Best Paper Award Selection - Editorial Board Site

2003, Volume13

136 pages

Issue price - $75.00

DIESEL FUEL SPRAY DROPLET SIZES AND VOLUME FRACTIONS FROM THE REGION 25 MM BELOW THE ORIFICE

Jennifer Labs
Division of Engineering, Colorado School of Mines, Golden, Colorado, USA

Terry E. Parker
Division of Engineering, Colorado School of Mines, Golden, Colorado, USA

ABSTRACT

Droplet diameter and volume fraction measurements are reported for three different fuels (diesel fuel, dodecane, and methyl oleate) as a/unction of radial position within a pressure-atomized spray typical of diesel systems. Injection system parameters were peak pressures of 62 MPa and a single-orifice injector with a 0.31-mm orifice diameter and an L/D ratio of approximately 2. Results are for individual injection events into atmospheric-pressure and ambient-temperature air at an axial distance of 25 mm from the nozzle. Measurements relied on infrared scattering, which was specifically chosen due to the high droplet number densities of these sprays. Details of the measurement technique are presented along with results. Results indicate droplet diameters are the smallest at the spray centerline (2-3.25 mm), and grow with radial distance from the centerline (6-8 mm at the spray periphery). Volume fractions greater than 1% are seen at the spray centerline, and, once the spray has developed, the majority of the mass is contained in the central 0.75-mm-radial region. Spray details presented include the definition of transient time periods for the spray, the spray width as a function of time, the coupling between injection pressure and observed diameters (SMD) and volume fractions, and the differences in the spray properties as a function of fuel type.