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Technique for Analyzing Swirl Injectors of Direct-Injection Gasoline Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 05, 2001 by SAE International in United States
Annotation ability available
Event: SAE 2001 World Congress
This paper describes the numerical and experimental approaches that were applied to study swirl injectors that are widely used in direct-injection gasoline engines. As the numerical approach, the fuel and air flow inside an injector was first analyzed by using a two-phase flow analysis method [VOF (Volume of Fluid) model]. A time-series analysis was made of the flow though the injector and also of the air cavity that forms at the nozzle and influences fuel atomization. The calculated results made clear the process from initial spray formation to liquid film formation. Spray droplet formation was then analyzed with the synthesized spheroid particle (SSP) method. As the experimental approach, in order to measure the cavity factor that represents the liquid film thickness, nozzle exit flow velocities were measured by particle image velocimetry (PIV). Previously, these high velocities have been difficult to measure, but a newly developed PIV system using two CCD cameras to capture high-speed flow has made such measurement possible. Spray droplets sizes and surrounding air flow velocity fields were also measured by PIV.
These two approaches were applied to test nozzles, and the calculated results were compared with the experimental data. The relatively good agreement found between the two sets of results confirmed the effectiveness of these approaches.
CitationKubo, M., Sakakida, A., and Iiyama, A., "Technique for Analyzing Swirl Injectors of Direct-Injection Gasoline Engines," SAE Technical Paper 2001-01-0964, 2001, https://doi.org/10.4271/2001-01-0964.
- Iiyama Akihiro et al. “Attainment of High Power with Low Fuel Consumption and Exhaust Emissions in a Direct-Injection Gasoline Engine,” FISITA 1998
- Tanasawa Y. et al. “A Study on Swirl Atomizer,” Tech. Rev. Tohoku Univ. 10 1 1955 27
- Ren W. M. Nally, J. F. Jr. “Computations of Hollow-Cone Sprays from a Pressure-Swirl Injector,” SAE Paper No. 981610 1988
- Xu Min Markle Lee E. “CFD-Aided Development of Spray for an Outwardly Opening Direct Injection Gasoline Engine,” SAE Paper No. 980493 1998
- Miyajima A. et al. “A Study on Fuel Spray Pattern Control of Fuel Injector of Direct Gasoline Direct Injection Engines,” SAE Paper No. 2000-01-1045 2000
- Arcoumanis C. Gavaises M. “Pressure-Swirl Atomizers for DISC Engines: Further Modeling and Experiments,” SAE Paper No. 2000-01-1044
- Preussner C. et al. “GDI: Interaction Between Mixture Preparation, Combustion System and Injector Performance,” SAE Paper No. 980498 1998
- Iwakiri Y. et al. “Effectiveness and Issues of Various Measurement Techniques Used in Evaluating Spray Characteristics in a Direct-Injection Gasoline Engine,” Proceedings of the 15th Internal Combustion Engine Symposium
- Hirt et al. “Volume of Fluid (VOF) Method for Dynamical Free Boundaries,” J. Comput. Phys. 100 201 225 1981
- Kubo M. et al. “An Analysis of Swirl Injector Sprays by Using PIV and Its Application to Injector Design,” Proceedings of Kanto Branch Annual Meeting of the Japan Society of Mechanical Engineering 2000
- Naito K. et al. “Synthesized Spheroid Particle (SSP) Method for Calculating Spray Phenomena in Direct-Injection SI Engines,” SAE Paper No. 962017