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Large-Eddy Simulation on the Effects of Fuel Injection Pressure on the Gasoline Spray Characteristics
Technical Paper
2019-01-0060
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Increasing the injection pressure in gasoline direct injection engines has a substantial potential to reduce emissions while maintaining a high efficiency in spark ignition engines. Present gasoline injectors are operating in the range of 20 MPa to 25 MPa. Now there is an interest in higher fuel injection pressures, for instance, around 40 MPa, 60 MPa and even higher pressures, because of its potential for further emission reduction and fuel efficiency improvements. In order to fully utilize the high-pressure fuel injection technology, a fundamental understanding of gasoline spray characteristics is vital to gain insight into spray behavior under such high injection pressures. The understanding achieved may also be beneficial to improve further model development and facilitate the integration of such advanced injection systems into future gasoline engines. In the present study, a gasoline fuel spray has been investigated over a range of fuel injection pressures from 40 to 150 MPa through a numerical simulation study. The numerical calculations have been performed in a constant volume chamber under non-vaporizing conditions to best match the experimental setup. The numerical model utilized a large-eddy simulation (LES) approach for the gas flow and a standard Lagrangian spray model for the liquid phase. The spray atomization has been modeled using the Kelvin Helmholtz - Rayleigh Taylor (KH-RT) atomization model with a droplet size distribution from the injector assumed to follow a Rosin-Rammler distribution function. Simulation results for the spray liquid penetration length are validated with experimental findings under different fuel injection pressures. Afterwards, an arithmetic mean droplet diameter (D10) and a Sauter mean droplet diameter (D32) as a function of pressure are compared against the measured droplet diameters. Simulated drop size distributions are presented and compared with measured droplet sizes. The results indicate that a high fuel injection pressure increases the liquid penetration length and significantly reduces droplet sizes. The results also exhibit that the SMD decreases from 13.4 μm to 7.5 μm, when injection pressure changes from 40 MPa to 150 MPa and that probability of finding the 5-9 μm droplet diameter decreases from 72% to 40% for the injection pressure drops from 150 MPa to 40 MPa.
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Wadekar, S., Yamaguchi, A., and Oevermann, M., "Large-Eddy Simulation on the Effects of Fuel Injection Pressure on the Gasoline Spray Characteristics," SAE Technical Paper 2019-01-0060, 2019, https://doi.org/10.4271/2019-01-0060.Data Sets - Support Documents
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References
- Vuorinen, V.A., Hillamo, H., and Kaario, O. , “Effect of Droplet Size and Atomization on Spray Formation: A Priori Study Using Large-Eddy Simulation,” Flow Turbulence Combust, 2011, doi:10.1007/s10494-010-9266-3.
- Koh1, H., Kim, D., Shin, S., and Yoon, Y. , “Spray Characterization in High Pressure Environment Using Optical Line Patternator,” Measurement Science and Technology, 2006, doi:10.1088/0957 0233/17/8/015.
- Pastor, J.V., López, J.J., Garcia, J.M., and Pastor, J.M. , “A 1D Model for Description of Mixing Controlled Inert Diesel Spray,” Fuel, 2008, doi:10.1016/j.fuel.2008.04.017.
- Matsumoto, Y., Gao, J., Namba, M., and Nishida, K. , “Mixture Formation and Combustion Processes of Multi-Hole Nozzle with Micro Orices for D.I. Diesel Engines,” SAE Technical Paper 2007-01-4049, 2007, doi:10.4271/2007-01-4049.
- Jacobsson, L. and Chomiak, J. , “Injection Orice Shape: Effects on Combustion and Emission Formation in Diesel Engines,” SAE Technical Paper 972964, 1997, doi:10.4271/972964.
- Mitroglou, N., Nouri, J., Yan, Y., Gavaises, M. et al. , “Spray Structure Generated by Multi-Hole Injectors for Gasoline Direct-Injection Engines,” SAE Technical Paper 2007-01-1417, 2007, doi:10.4271/2007-01-1417.
- Matousek, T., Dageforde, H., and Bertsch, M. , “Influence of Injection Pressures up to 300 Bar on Particle Emissions in a GDI Engine,” in 17th ETH Conference on Combustion Generated Nanoparticles, 2013.
- Buri, S., Kubach, H., and Spicher, U. , “Effects of Increased Injection Pressures of up to 1000 Bar-Opportunities in Stratified Operation in a Direct-Injection Spark-Ignition Engine,” International Journal of Engine Research, 2010, doi:11.10.1243/14680874JER608.
- Payri, R., García, A., Domenech, V., Durrett, R. et al. , “An Experimental Study of Gasoline Effects on Injection Rate, Momentum Flux and Spray Characteristics Using a Common Rail Diesel Injection System,” Fuel, 2012, doi:10.1 016/j.fuel.2011.11.065.
- Tian, J., Zhao, M., Long, W., Nishida, K. et al. , “Experimental Study on Spray Characteristics under Ultra-High Injection Pressure for DISI Engines,” Fuel, 2016, doi:10.1016/j.fuel.2016.08.086.
- Kim, K., Kim, D., Jung, Y., and Bae, C. , “Spray and Combustion Characteristics of Gasoline and Diesel in a Direct Injection Compression Ignition Engine,” Fuel, 2013, doi:10.1016/j.fuel.2013.02.060.
- Medina, M., Fatouraie, M., and Wooldridge, M. , “High-Speed Imaging Studies of Gasoline Fuel Sprays at Fuel Injection Pressures from 300 to 1500 Bar,” SAE Technical Paper 2018-01-0294, 2018, doi:10.4271/2018-01-0294.
- Chrigui, M., Sadiki, A., and Ahmadi, G. , “Study of Interaction in Spray between Evaporating Droplets and Turbulence Using Second Order Turbulence RANS Modelling and a Lagrangian Approach,” Progress in Computational Fluid Dynamics, 2004, doi:10.1504/PCFD.2004.004084.
- Paredi, D., Lucchini, T., D'Errico, G., and Onorati, A. , “Combined Experimental and Numerical Investigation of the ECN Spray G under Different Engine-like Conditions,” SAE Technical Paper 2018-01-0281, 2018, doi:10.4271/2018-01-0281.
- Wang, Y., Lee, W., Reitz, R., and Diwakar, R. , “Numerical Simulation of Diesel Sprays Using an Eulerian-Lagrangian Spray and Atomization (ELSA) Model Coupled with Nozzle Flow,” SAE Technical Paper 2011-01-0386, 2011, doi:10.4271/2011-01-0386.
- Apte, S.V., Gorokhovski, M., and Moin, C. , “LES of Atomizing Spray with Stochastic Modeling of Secondary Breakup,” International Journal of Multiphase Flow 29(9), 2003, doi:10.1016/S0301-9322(03)00111-3.
- Allocca, L., Bartolucci, L., Cordiner, S., Lazzaro, M. et al. , “ECN Spray G Injector: Assessment of Numerical Modeling Accuracy,” SAE Technical Paper 2018-01-0306, 2018, doi:10.4271/2018-01-0306.
- Senecal, P., Pomraning, E., Richards, K., and Som, S. , “An Investigation of Grid Convergence for Spray Simulations Using an LES Turbulence Model,” SAE Technical Paper 2013-01-1083, 2013, doi:10.4271/2013-01-1083.
- Pera, C., Réveillon, J., Vervisch, L., and Domingo, P. , “Modeling Subgrid Scale Mixture Fraction Variance in LES of Evaporating Spray,” Combustion and Flame, 2006, doi:10.1016/j.combustflame.2006.07.003.
- Rutland, C.J. , “Large-Eddy Simulations for Internal Combustion Engines-A Review,” International Journal of Engine Research, 2011, doi:10.1177/1468087411407248.
- Smagorinsky, J. , “General Circulation Experiments with the Primitive Equations: I. The Basic Experiment,” Mon. Wea. Rev., 1963, doi:10.1175/1520-0493(1963)091<0099:GCE WTP>2.3.CO;2.
- Reitz, R. , “Modeling Atomization Processes in High-Pressure Vaporizing Sprays,” Atomization Spray Technology, 1987.
- Rolf, R. , “Modeling Spray Atomization with the Kelvin-Helmholtz/Rayleigh-Taylor Hybrid Model,” Atomization Spray Technology, 1999, doi:10.1615/AtomizSpr.v9.i6.40.
- Solsjö, R. and Bai, X.-S. , “Injection of Fuel at High Pressure Conditions: LES Study,” SAE Technical Paper 2011-24-0041, 2011, doi:10.4271/2011-24-0041.
- Banerjee, S. and Rutland, C. , “On LES Grid Criteria for Spray Induced Turbulence,” SAE Technical Paper 2012-01-0141, 2012, doi:10.4271/2012-01-0141.
- Bharadwaj, N., Rutland, C.J., and Chang, S. , “Large Eddy Simulation Modelling of Spray-Induced Turbulence Effects,” International Journal of Engine Research 10(2):97-119, 2009, doi:10.1243/14680874JER02309.
- The open source CFD toolbox available at http://www.openfoam.com, 2014.
- Rosin, P. and Rammler, E. , “The Laws Governing the Fineness of Powdered Coal,” Journal of the Institute of Fuel, 1933.
- Hiroyasu, H. and Arai, M. , “Structures of Fuel Sprays in Diesel Engines,” SAE Technical Paper 900475, 1990, doi:10.4271/900475.