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Diesel injector elasticity effects on internal nozzle flow
Technical Paper
2019-01-2279
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Numerical simulations of internal nozzle flow that include transient needle valve motion offer the potential to better predict spray penetration, mixing and liquid breakup. For example, the level of gas initially inside the sac and holes, as well as the rate of needle movement, influence the initial fuel delivery rate and spray development, thereby affecting ignition position and combustion. In this study, needle movement and gas exchange inside operating transparent fuel injectors are imaged at high speed, and CFD simulations with fine resolution (2- micrometers) in the needle-seat area are performed to understand the impact of needle movement and initial gas in the sac on ramp-up in rate of injection. The injector bodies and sac geometries are replicas of the Engine Combustion Network Spray A and Spray D injectors. Imaging shows that gas is ingested into the injector at the beginning of needle movement, an unexpected results given the high injection pressure above the needle valve. Finite element analysis simulations accounting for the elastic properties of the metal seat and needle are performed to explain this result. As forces on the needle and seat are relieved at the beginning of injection, the sac volume enlarges while contact between sealing surfaces remains. Needle and nozzle wall measurements confirm that the needle tip may move roughly 5-10 micrometers before the passage opens at the needle seat to allow flow and pressurization of the sac. Measured needle movement from an experiment (optical or x-ray) must be corrected to achieve a different “needle gap” profile for simulations with no elasticity. This elasticity-corrected profile should be used for CFD simulations, otherwise, early and incorrect spray development will be predicted. Simulations with the corrected needle-lift profile and gas initially within the sac show that the mass flow rate at the start of injection includes cycling in flow rate caused primarily by sac pressure fluctuations, which are recommended for future Lagrangian CFD simulations.
Authors
- Koji Yasutomi - Sandia National Laboratories, 7011 East Ave, 94550 Livermore
- Joonsik Hwang - Sandia National Laboratories, 7011 East Ave, 94550 Livermore
- Julien Manin - Sandia National Laboratories, 7011 East Ave, 94550 Livermore
- Lyle Pickett - Sandia National Laboratories, 7011 East Ave, 94550 Livermore
- Marco Arienti - Sandia National Laboratories, 7011 East Ave, 94550 Livermore
- Shane Daly - Oregon State University, 1500 SW Chandler Ave., Bend, OR
- Scott Skeen - Sandia National Laboratories, 7011 East Ave, 94550 Livermore
Citation
Yasutomi, K., Hwang, J., Manin, J., Pickett, L. et al., "Diesel injector elasticity effects on internal nozzle flow," SAE Technical Paper 2019-01-2279, 2019, https://doi.org/10.4271/2019-01-2279.Data Sets - Support Documents
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References
- T. Mori , N. Shirahashi , T. Matsubara , K. Nagato , K. Hirata , and Y. Okuda , Advanced Technologies for Noise-Vibration on New SKYACTIV-D 2.2 Mazda technical report 66 71 2018
- J. Cha , S. Y. Yang , N. Naser , A. Ichim , and S. H. Chung , High Pressure and Split Injection Strategies for Fuel Efficiency and Emissions in DI Diesel Engine SAE Technical Paper , 2015-01-1823 2015
- N. Horibe , Z. Bao , T. Taguchi , K. Egoshi , H. Kawanabe , and T. Ishiyama , Improvement of Thermal Efficiency in a Diesel Engine with High-Pressure Split Main Injection SAE Technical Paper , 2018-01-1791 2018
- M. P. B. Musculus and K. Kattke , Entrainment Waves in Diesel Jets SAE International Journal of Engines 2 1 1170 1193 2009
- C. Arcoumanis and M. S. Baniasad , Analysis of Consecutive Fuel Injection Rate Signals Obtained by the Zeuch and Bosch Methods SAE Technical Paper , 930921 1993
- L. M. Pickett , J. Manin , R. Payri , M. Bardi , and J. Gimeno , Transient Rate of Injection Effects on Spray Development SAE Technical Paper , 2013-24-0001 2013
- R. Payri , F. J. Salvador , J. Gimeno , and G. Bracho , A new methodology for correcting the signal cumulative phenomenon on injection rate measurements Experimental Techniques 32 1 46 49 2008
- G. R. Bower and D. E. Foster , A Comparison of the Bosch and Zuech Rate of Injection Meters SAE Technical Paper, 910724 1991
- Engine Combustion Network | Engine Combustion Network Website https://ecn.sandia.gov/
- ECN Rate of injection. https://www.cmt.upv.es/ECN03.aspx
- M. Battistoni , Q. Xue , S. Som , and E. Pomraning , Effect of Off-Axis Needle Motion on Internal Nozzle and Near Exit Flow in a Multi-Hole Diesel Injector SAE International Journal of Fuels and Lubricants 7 1 167 182 2014
- M. Battistoni , C. Poggiani , and S. Som , Prediction of the Nozzle Flow and Jet Characteristics at Start and End of Injection: Transient Behaviors SAE International Journal of Engines 9 1 84 97 2015
- K. Saha , P. Srivastava , S. Quan , P. K. Senecal , E. Pomraning , and S. Som , Modeling the Dynamic Coupling of Internal Nozzle Flow and Spray Formation for Gasoline Direct Injection Applications SAE Technical Paper, 2018-01-0314 2018
- R. Torelli Evaluation of Shot-to-Shot In-Nozzle Flow Variations in a Heavy-Duty Diesel Injector Using Real Nozzle Geometry SAE Technical Paper, 2018-01-0303 2018
- M. Bode , A New Euler/Lagrange Approach for Multiphase Simulations of a Multi-Hole GDI Injector SAE Technical Paper, 2015-01-0949 2015
- P. Mitra , Identification and Characterization of Steady Spray Conditions in Convergent, Single-Hole Diesel Injectors SAE Technical Paper, 2019-01-0281
- M. Arienti and M. Sussman , A numerical study of the thermal transient in high-pressure diesel injection International Journal of Multiphase Flow 88 205 221 2017
- M. Bode , Effects of Cavitation and Hydraulic Flip in 3-Hole GDI Injectors SAE International Journal of Fuels and Lubricants 10 2 380 393 2017
- C. Mohapatra , G. Jacobsohn , E. Baldwin , and D. Schmidt , Modeling Sealing in Transient Injector Simulations 2017
- A. L. Kastengren , Engine Combustion Network (Ecn): Measurements of Nozzle Geometry and Hydraulic Behavior Atomization and Sprays 22 12 1011 1052 2012
- A. Kastengren , C. F. Powell , F. Z. Tilocco , and K. Fezzaa , Initial Evaluation of Engine Combustion Network Injectors with X-Ray Diagnostics ILASS-Americas 2011 Ventura, CA 2012
- J. Manin , L. M. Pickett , and K. Yasutomi , Transient cavitation in transparent diesel injectors 2018
- J. Manin , M. Bardi , L. M. Pickett , R. N. Dahms , and J. C. Oefelein , Microscopic investigation of the atomization and mixing processes of diesel sprays injected into high pressure and temperature environments Fuel 134 531 543 2014
- C. Crua , T. Shoba , M. Heikal , M. Gold , and C. Higham , High-Speed Microscopic Imaging of the Initial Stage of Diesel Spray Formation and Primary Breakup SAE Technical Paper, 2010-01-2247 2010
- S. Daly , E. Cenker , L. M. Pickett , and S. Skeen , The Effects of Injector Temperature on Spray Characteristics in Heavy-Duty Diesel Sprays SAE Technical Papers, pp. 2018-01–0284 2018
- W. Edelbauer , D. Suzzi , P. Sampl , R. Tatschl , C. Krueger , and B. Weigand , New concept for on-line coupling of 3D Eulerian and Lagrangian spray approaches in engine simulations 2006
- B. Befrui , G. Corbinelli , M. D’Onofrio , and D. Varble , GDI Multi-Hole Injector Internal Flow and Spray Analysis SAE Technical Paper, 2011-01-1211 2011
- A. Vallet , A. A. Burluka , and R. BOrghi , Development of a Eulerian model for the ‘Atomization’ of a liquid jet Atomization and Sprays 11 619 642 2001
- J. M. Garcia-Oliver , J. M. Pastor , A. Pandal , N. Trask , E. Baldwin , and D. Schmidt , Diesel Spray CFD Simulations Based on the Sigma-Y Eulerian Atomization Model Atomization and Sprays 23 1 71 95 2013
- Q. Xue , Eulerian CFD Modeling of Coupled Nozzle Flow and Spray with Validation Against X-Ray Radiography Data SAE International Journal of Engines 7 2 1061 1072
- Engine Combustion Network | Injector elasticity https://ecn.sandia.gov/pub-links/ky002/injector-elasticity/