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Mass-Related Properties of Atomizers for Direct-Injection SI Engines
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English
Abstract
Mass-related properties of four atomizers were estimated with the use of a mechanical transient patternator. The properties presented on a temporal and spatial basis are the axial liquid mass flux, liquid fuel to air ratio, and liquid axial velocity. The data are presented in two formats. The first format consists of the mass-related properties that occurred radially between two planes positioned 2.0 cm and 2.25 cm along the atomizer axis. A second format consists of interpolated contour plots of the axial liquid mass flux for all of the spray systems studied.
The atomizers used in the study consisted of three liquid-only high-pressure systems and one air-assist system. Two of the liquid-only high-pressure systems and the air - assist system were operated with a volumetric delivery of 20 mm3 per injection while injecting into ambient conditions. A third liquid-only high-pressure system was operated with a delivery of 15 mm3 per injection.
Ranges of 0 to 10 for the liquid fuel to air ratios, and 0 to 40 g/cm2/sec for the mass flux were observed. Average axial velocities were in the range of 0 and 2300 cm/sec. All of the measured properties exhibited large variations in magnitude and location, depending on injection type.
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Citation
Hoffman, J., Khatri, F., Martin, J., and Coates, S., "Mass-Related Properties of Atomizers for Direct-Injection SI Engines," SAE Technical Paper 980500, 1998, https://doi.org/10.4271/980500.Also In
References
- Hoffman, Jeffrey A. Martin Jay K. Coates Sam W. “Spray Photographs and Preliminary Spray Mass Flux Distribution Measurements of a Pulsed Pressure Atomizer” ILASS-Americas 96, 9th Annual Conference of Liquid Atomization and Spray System San Francisco 1996
- Hoffman, Jeffrey A. Eberhardt Eric Martin Jay K. “Comparison Between Air-Assisted and Single-Fluid Pressure Atomizers for Direct-Injection SI Engines Via Spatial and Temporal Mass Flux Measurements” SAE Paper 970630 Society of Automotive Engineers Warrendale, PA 1997
- Hoffman, Jeffrey A. Martin Jay K. “Review of Transient Mass Flux Measurements using a Mechanical Transient Patternator” ILASS-Americas 97, 10th Annual Conference of Liquid Atomization and Spray System Toronto, Canada 1997
- Hoffman, Jeffrey A. Martin Jay K. Coates Sam W. “A Technique for Obtaining Spatial and Temporal Mass Flux Measurements of a Pulsed Spray - a Description of the Hardware and Methodology” Review of Scientific Instruments November 1997
- Kline, S. J. McClintock F. A. “Describing Uncertainties in Single-Sample Experiments” Mechanical Engineering January 1953