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Spray Characterization of Gasoline Direct Injection Sprays Under Fuel Injection Pressures up to 150 MPa with Different Nozzle Geometries
ISSN: 0148-7191, e-ISSN: 2688-3627
Published January 15, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Maximum fuel injection pressures for GDI engines is expected to increase due to positive effects on emissions and engine-efficiency. Current GDI injectors have maximum operating pressures of 35 MPa, but higher injection pressures have yielded promising reductions in particle number (PN) and improved combustion stability. However, the mechanisms responsible for these effects are poorly understood, and there have been few studies on fuel sprays formed at high injection pressures.
This paper summarizes experimental studies on the properties of sprays formed at high injection pressures. The results of these experiments can be used as inputs for CFD simulations and studies on combustion behavior, emissions formation, and combustion system design. The experiments were conducted using an injection rate meter and optical methods in a constant volume spray chamber. Injection rate measurements were performed to determine the injectors’ flow characteristics. Spray imaging was performed using a high-speed video camera. Several spray properties such as the liquid spray penetration, spray plume angle, and the spray breakup point were determined as functions of the fuel injection pressure and injected fuel mass by image post-processing. The impact of fuel pressure on spray droplet size was also investigated using two-component Phase Doppler Interferometry.
Piezoelectric injectors for diesel engines were used with modified nozzles that produce sprays resembling those generated in gasoline engines. Experiments were performed with fuel injection pressures ranging from 20 to 150 MPa, and chamber pressures of 0.1 and 0.6 MPa. In addition, four different nozzles with three different nozzle configurations and either 6 or 10 holes were used to determine how hole geometry affects spray formation.
The study’s key findings are that increasing the fuel injection pressure advances spray breakup and creates smaller droplets, improving mixture formation and accelerating evaporation. The nozzle type and the ambient pressure both significantly affect aspects of spray behavior such as spray tip development.
CitationYamaguchi, A., Koopmans, L., Helmantel, A., Karrholm, F. et al., "Spray Characterization of Gasoline Direct Injection Sprays Under Fuel Injection Pressures up to 150 MPa with Different Nozzle Geometries," SAE Technical Paper 2019-01-0063, 2019, https://doi.org/10.4271/2019-01-0063.
Data Sets - Support Documents
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- Liang, B., Ge, Y., Tan, J., Han, X. et al. , “Comparison of PM Emissions from a Gasoline Direct Injected (GDI) Vehicle and a Port Fuel Injected (PFI) Vehicle Measured by Electrical Low Pressure Impactor (ELPI) with Two Fuels: Gasoline and M15 Methanol Gasoline,” Journal of Aerosol Science 57:22-31, 2013, doi:20.1016/j.jaerosci.2012.11.008.
- Chen, L., Liang, Z., Zhang, X., and Shuai, S. , “Characterizing Particulate Matter Emissions from GDI and PFI Vehicles under Transient and Cold Start Conditions,” Fuel 189:131-140, 2017, doi:10.1016/j.fuel.2016.10.055.
- Piock, W., Befrui, B., Berndorfer, A., and Hoffmann, G. , “Fuel Pressure and Charge Motion Effects on GDi Engine Particulate Emissions,” SAE Int. J. Engines 8(2):464-473, 2015, doi:10.4271/2015-01-0746.
- Peer, J., Backes, F., Sauerland, H., Härtl, M. et al. , “Development of a High Turbulence, Low Particle Number, High Injection Pressure Gasoline Direct Injection Combustion System,” SAE Int. J. Engines 9(4):2301-2311, 2016, doi:10.4271/2016-01-9046.
- Wetzel, J. , “Optical Analysis of the Influence of Injector Hole Geometry on Mixture Formation in Gasoline Direct Injection Engines,” Automot. Engine Technol. 1:57-67, 2016, doi:10.1007/s41104-016-0005-1.
- Imoethl, W., Gestri, L., Maragliulo, M., Del-Frate, L. et al. , “A DOE Approach to Engine Deposit Testing Used to Optimize the Design of a Gasoline Direct Injector Seat and Orifice,” SAE Int. J. Fuels Lubr. 5(3):1078-1095, 2012, doi:10.4271/2012-01-1642.
- Postrioti, L., Cavicchi, A., Brizi, G., Berni, F. et al. , “Experimental and Numerical Analysis of Spray Evolution, Hydraulics and Atomization for a 60 MPa Injection Pressure GDI System,” SAE Technical Paper 2018-01-0271, 2018, doi:10.4271/2018-01-0271.
- Migliaccio, M., Montanaro, A., Beatrice, C., Napolitano, P. et al. , “Experimental and Numerical Analysis of a High-Pressure Outwardly Opening Hollow Cone Spray Injector for Automotive Engines,” Fuel 196:508-519, 2017.
- Medina, M. and Wooldridge, M. , “High-Speed Studies of Gasoline Fuel Sprays at Fuel Injection Pressures from 300 to 1500 Bar,” SAE Technical Paper 2018-01-0294, 2018, doi:10.4271/2018-010-0294.
- Payri, R., Garcia, A., Domenech, V., Durrett, R. et al. , “Hydraulic Behavior and Spray Characteristics of a Common Rail Diesel Injection System Using Gasoline Fuel,” SAE Technical Paper 2012-01-0458, 2012, doi:10.4271/2012-01-0458.
- Reitz, R. and Bracco, F. , “On the Dependence of Spray Angle and Other Spray Parameters on Nozzle Design and Operating Conditions,” SAE Technical Paper 790494, 1979, doi:10.4271/790494.
- Dahlander, P., Iemmolo, D., and Tong, Y. , “Measurements of Time-Resolved Mass Injection Rates for a Multi-Hole and an Outward Opening Piezo GDI Injector,” SAE Technical Paper 2015-01-0929, 2015, doi:10.4271/2015-01-0929.
- Hiroyasu, H. and Arai, M. , “Structures of Fuel Sprays in Diesel Engines,” SAE Technical Paper 900475, 1990, doi:10.4271/900475.
- Huang, W., Moon, S., and Ohsawa, K. , “Near-Nozzle Dynamics of Diesel Spray under Varied Needle Lifts and its Prediction Using Analytical Model,” Fuel 180:292-300, 2016, doi:10.1016/j.fuel.2016.04.042.
- Postrioti, L., Buitoni, G., Pesce, F.C., and Ciaravino, C. , “Zeuch Method-Based Injection Rate Analysis of a Common-Rail System Operated with Advanced Injection Strategies,” Fuel 128:188-198, 2014, doi:10.1016/j.fuel.2014.03.006.
- Oki, M., Matsumoto, S., Toyoshima, Y., Ishisaka, K. et al. , “180MPa Piezo Common Rail System,” SAE Technical Paper 2006-01-0274, 2006, doi:10.4271/2006-01-0274.
- Blessing, M., König, G., Krüger, C., Michels, U. et al. , “Analysis of Flow and Cavitation Phenomena in Diesel Injection Nozzles and its Effects on Spray and Mixture Formation,” SAE Technical Paper 2003-01-1358, 2003, doi:10.4271/2003-01-1358.
- Chen, Z., He, Z., Guan, W., Wang, Q. et al. , “Experimental Study of the Effect of Nozzle Geometry on String Cavitation and Spray Characteristics in Real-Size Optical Diesel Nozzles,” presented at in CAV2018, USA, May 14-16, 2018.
- Zhou, H., He, W., He, Z., Sun, S. et al. , “Experimental Study on Correlation between String Cavitation and Spray Angle of Diesel Injector Nozzles with Tapered Orifice,” presented at in CAV2018, USA, May 14-16, 2018.
- He, Z., Zhang, Z., Guo, G., Wnag, Q. et al. , “Visual Experiment of Transient Cavitating Flow Characteristics in the Real-Size Diesel Injector Nozzle,” International Communications in Heat and Mass Transfer 78:13-20, 2016, doi:10.1016/j.icheatmasstransfer.2016.08.004.
- He, Z., Guo, G., Tao, X., Zhong, W. et al. , “Study of the Effect of Nozzle Hole Shape on Internal Flow and Spray Characteristics,” International Communications in Heat and Mass Transfer 71:1-8, 2016, doi:10.1016/j.icheatmasstransfer.2015.12.002.
- Lefebvre, A.H. , Atomization and Sprays Second Edition (CRC Press, 2017), 17-19. ISBN:9781498736251.
- Zandi, A., Sohrabi, S., and Shams, M. , “Influence of Nozzle Geometry and Injection Conditions on the Cavitation Flow Inside a Diesel Injector,” IJAE 5(1):939-954, 2015.
- Hung, D., Harrington, D., Gandhi, A., Markle, L. et al. , “Gasoline Fuel Injector Spray Measurement and Characterization-A New SAE J2715 Recommended Practice,” SAE Int. J. Fuels Lubr. 1(1):534-548, 2009, doi:10.4271/2008-01-1068.