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Numerical Simulation of a Direct-Acting Piezoelectric Prototype Injector Nozzle Flow for Partial Needle Lifts
Technical Paper
2017-24-0101
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Actual combustion strategies in internal combustion engines rely on fast and accurate injection systems to be successful. One of the injector designs that has shown good performance over the past years is the direct-acting piezoelectric. This system allows precise control of the injector needle position and hence the injected mass flow rate. Therefore, understanding how nozzle flow characteristics change as function of needle dynamics helps to choose the best lift law in terms of delivered fuel for a determined combustion strategy. Computational fluid dynamics is a useful tool for this task. In this work, nozzle flow of a prototype direct-acting piezoelectric has been simulated by using CONVERGE. Unsteady Reynolds-Averaged Navier-Stokes approach is used to take into account the turbulence. Results are compared with experiments in terms of mass flow rate. The nozzle geometry and needle lift profiles were obtained by means of X-rays in previous works. Simulations are able to properly capture the relationship between instantaneous partial needle lifts and the corresponding rate of injection. The difference in mass flow rates between simulations and experiments is below 5%, although experiments show some oscillations that are not predicted by the model employed here. In order to simulate the experimental rising slope of the injected mass, the pressure evolution at the inlet boundary condition had to be modified, increasing the pressure from the discharge value up to the injection pressure. This modification in the upstream pressure value seems to be in accordance with the literature. Cavitation phenomenon and flow detachment have been observed downstream the needle seat for low lift values. The converging shape of the orifices overrides cavitation inside them, and also allows the flow to reattach even when the length to diameter ratio is below 10. However, fuel vapor is still present at the orifices exit for low needle lift cases, which affects velocity and fuel distributions within the sprays.
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Marti-Aldaravi, P., Saha, K., Gimeno, J., and Som, S., "Numerical Simulation of a Direct-Acting Piezoelectric Prototype Injector Nozzle Flow for Partial Needle Lifts," SAE Technical Paper 2017-24-0101, 2017, https://doi.org/10.4271/2017-24-0101.Data Sets - Support Documents
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References
- Matsumoto , S. , Yamada , K. , and Date , K. Concepts and Evolution of Injector for Common Rail System SAE Technical Paper 2012-01-1753 2012 10.4271/2012-01-1753
- Payri , R. , Gimeno , J. , Venegas , O. , and Plazas , A. Effect of Partial Needle Lift on the Nozzle Flow in Diesel Fuel Injectors SAE Technical Paper 2011-01-1827 2011 10.4271/2011-01-1827
- Dober , G. , Tullis , S. , Greeves , G. , Milovanovic , N. et al. The Impact of Injection Strategies on Emissions Reduction and Power Output of Future Diesel Engines SAE Technical Paper 2008-01-0941 2008 10.4271/2008-01-0941
- Kastner O. , Atzler F. , Juvenelle C. , Rotondi R. , Weigand A. Directly actuated piezo injector for advanced injection strategies towards cleaner diesel engines Towards Clean diesel Engines 2009
- Ferrari A. , Mittica A. FEM modeling of the piezoelectric driving system in the design of direct-acting diesel injectors Applied Energy 99 471 483 2012
- Oda T. , Goda Y. , Kanaike S. , Aoki K. , Ohsawa K. Experimental Study about internal Cavitating Flow and Primary Atomization of a Large-Scaled VCO diesel Injector with Eccentric Needle ICLASS 2009, 11th Triennial International Annual Conference on Liquid Atomization and Spray Systems Vail, Colorado, USA July 2009
- Battistoni , M. , Xue , Q. , Som , S. , and Pomraning , E. Effect of Off-Axis Needle Motion on Internal Nozzle and Near Exit Flow in a Multi-Hole Diesel Injector SAE Int. J. Fuels Lubr. 7 1 167 182 2014 10.4271/2014-01-1426
- Salvador F. J. , Martıınez-López J. , Caballer M. , De Alfonso C. Study of the influence of the needle lift on the internal flow and cavitation phenomenon in diesel injector nozzles by CFD using RANS methods Energy Conversion and Management 66 246 256 2013
- Chiavola , O. and Palmieri , F. Modeling Needle Motion Influence on Nozzle Flow in High Pressure Injection System SAE Technical Paper 2007-01-0250 2007 10.4271/2007-01-0250
- Payri R. , Gimeno J. , Viera J. P. , Plazas A. H. Schlieren visualization of transient vapor penetration and spreading angle of a prototype diesel direct-acting piezoelectric injector ICLASS 2012, 12th Triennial International Annual Conference on Liquid Atomization and Spray Systems Heidelbert, Germany September 2012
- Payri R. , Gimeno J. , Viera J. P. , Plazas A. H. Needle lift profile influence on the vapor phase penetration for a prototype diesel direct acting piezoelectric injector Fuel 113 257 265 2013
- Payri R. , Gimeno J. , Venegas O. , Plazas A. H. Experimental and computational study of the influence of partial needle lift on nozzle flow in diesel fuel injectors Atomization and Sprays 22 687 714 2012
- Viera J. P. , Payri R. , Swantek A. B. , Duke D. J. , Sovis N. , Kastengren A. L. , Powell C. F. Linking instantaneous rate of injection to X-ray needle lift measurements for a direct-acting piezoelectric injector Energy Conversion and Management 112 350 358 2016
- Xue , Q. , Battistoni , M. , Som , S. , Quan , S. et al. Eulerian CFD Modeling of Coupled Nozzle Flow and Spray with Validation Against X-Ray Radiography Data SAE Int. J. Engines 7 2 1061 1072 2014 10.4271/2014-01-1425
- Convergent Science, Converge 2.3.0 Theory Manual 2016
- Yakhot V. , Orszag S. Renormalization group analysis of turbulence. Basic theory Journal of Scientific Computing 1 3 51 1986
- Menter F. R. Zonal Two Equation k-w, Turbulence Models for Aerodynamic Flows AIAA 93-29066 1993
- Battistoni M. , Duke D. J. , Swantek A. B. , Tilocco F. Z. , Powell C. F. , Som S. Effects of noncondensable gas on cavitating nozzles Atomization and Sprays 25 453 483 2015
- Ndiaye E. H. I. , Bazile J. P. , Nasri D. , Boned C. , Daridon J.-L. High pressure thermophysical characterization of fuel used for testing and calibrating diesel injection systems Fuel 98 288 294 2012
- Chorazewski M. , Dergal F. , Sawaya T. , Mokbel I. , Grolier J.-P. E. , Jose J. Thermophysical properties of Normafluid (ISO 4113) over wide pressure and temperature ranges Fuel 105 440 450 2013
- Payri , R. , Gimeno , J. , Marti-Aldaravi , P. , and Carreres , M. Assessment on Internal Nozzle Flow Initialization in Diesel Spray Simulations SAE Technical Paper 2015-01-0921 2015 10.4271/2015-01-0921
- Salvador F. J. , Gimeno J. , De la Morena J. , Carreres M. Using one-dimensional modeling to analyze the influence of the use of biodiesels on the dynamic behavior of solenoid-operated injectors in common rail systems: Results of the simulations and discussion Energy Conversion and Management 54 122 132 2012
- Payri R. , Lopez J. J. , Salvador F. J. , Martí-Aldarav , P. Development of a Methodology to Learn the Characteristics and Performances of Common Rail Injection Systems Based on Simulations with AMESim International Journal of Engineering Education 29 2 533 547 2013