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Influence of the Injector Geometry on Primary Breakup in Diesel Injector Systems
Technical Paper
2014-01-1427
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Diesel injection systems have a significant impact on the performance as well as emission and pollutant formation of modern diesel engines. Even though the geometry of atomizers became more and more complex over the last years, injection systems still have a large potential for improving the overall diesel engine combustion process. Due to the complexity of the atomization process, reliable models are not available, yet these are highly desired for supporting the design process. They have to be developed using detailed numerical simulations.
In this work, the “Spray A” reference case defined by the Engine Combustion Network is simulated under realistic operation conditions using a recently developed numerical framework for multiphase flows. A Large-Eddy Simulation of the nozzle internal flow is coupled with a Direct Numerical Simulation of the interfacial outside flow and the resulting primary breakup is analyzed. Additionally, the impact of the injector geometry on primary breakup is studied. For this purpose, the effect of the taper ratio of the injector nozzle and the turbulent kinetic energy at the injector exit on the primary breakup is discussed and a parametric study is performed.
It is shown that the taper ratio of the nozzle of modern injection systems has a large impact on the primary breakup because it directly influences the turbulent kinetic energy as well as the radial velocity component at the nozzle exit, which in turn affect the primary breakup.
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Bode, M., Diewald, F., Broll, D., Heyse, J. et al., "Influence of the Injector Geometry on Primary Breakup in Diesel Injector Systems," SAE Technical Paper 2014-01-1427, 2014, https://doi.org/10.4271/2014-01-1427.Also In
References
- Gorokhovski , M. and Herrmann , M. Modeling primary atomization Annual Review of Fluid Mechanics 40 343 366 2008 10.1146/annurev.fluid.40.111406.102200
- Herrmann , M. Eulerian interface tracking/Lagrangian point particle multi-scale coupling procedure Journal of Computational Physics 229 3 745 759 2010 10.1016/j.jcp.2009.10.009
- Marmottant , P. and Villermaux , E. On spray formation Journal of Fluid Mechanics 498 73 111 2004 10.1017/S0022112003006529
- Lasheras , J. and Hopfinger , E. Liquid Jet Instability and Atomization in a Coaxial Gas Stream Annual Review of Fluid Mechanics 32 275 308 2000 10.1146/annurev.fluid.32.1.275
- Payri , R. , Salvador , F.J. , Gimeno , J. , and de la Morena , J. Effects of nozzle geometry on direct injection diesel engine combustion process Applied Thermal Engineering 29 10 2051 2060 2009 10.1016/j.applthermaleng.2008.10.009
- Dumouchel , C. On the Experimental Investigation on Primary Atomization of Liquid Streams Experiments in Fluids 45 3 371 422 2008 10.1007/s00348-008-0526-0
- Shinjo , J. and Umemura , A. Detailed simulation of primary atomization mechanisms in diesel jet sprays (isolated identification of liquid jet tip effects) Proceedings of the Combustion Institute 33 2 2089 2097 2011 10.1016/j.proci.2010.07.006
- Luo , K. , Pitsch , H. , Pai , M.G. , and Desjardins , O. Direct numerical simulations and analysis of three-dimensional n-heptane spray flames in a model swirl combustor Proceedings of the Combustion Institute 33 2 2143 2152 2011 10.1016/j.proci.2010.06.077
- Lee , C.S. , Park , S.W. An Experimental and Numerical Study on Fuel Atomization Characteristics of High-Pressure Diesel Injection Sprays Fuel 81 18 2417 2423 2002 10.1016/S0016-2361(02)00158-8
- Lebas , R. , Menard , T. , Beau , P.A. , Berlemont , A. , and Demoulin F.X. Numerical Simulation of Primary Break- Up and Atomization: DNS and Modelling Study International Journal of Multiphase Flow 35 3 247 260 2009 10.1016/j.ijmultiphaseflow.2008.11.005
- Desjardins , O. , McCaslin , J. O. , Owkes , M. , and Brady , P. Direct numerical and large-eddy simulation of primary atomization in complex geometries Atomization and Sprays 23 11 1001 1048 2013 10.1615/AtomizSpr.2013007679
- Le Chenadec , V.H.M. , Pitsch , H. A Conservative Framework for Primary Atomization Computation and Application to the Study of Nozzle and Density Ratio Effects Atomization and Sprays 23 12 1139 1165 2013 10.1615/AtomizSpr.2013007243
- Le Chenadec , V.H.M. and Pitsch , H. A 3D Unsplit Forward/Backward Volume-of-Fluid Approach and Coupling to the Level Set Method Journal of Computational Physics 233 10 33 2013 10.1016/j.jcp.2012.07.019
- Le Chenadec , V.H.M. and Pitsch , H. A Monotonicity Preserving Sharp Interface Flow Solver for High Density Ratio Two-Phase Flows Journal of Computational Physics 249 185 203 2013 10.1016/j.jcp.2013.04.027
- Pickett , L. , Genzale , C. , Bruneaux , G. , Malbec , L. et al. Comparison of Diesel Spray Combustion in Different High-Temperature, High-Pressure Facilities SAE Int. J. Engines 3 2 156 181 2010 10.4271/2010-01-2106
- Engine Combustion Network http://www.sandia.gov/ecn Oct. 2013
- Kastengren , A.L. , Tilocco , F.Z. , Powell , C.F. , Manin , J. et al. Engine Combustion Network (ECN): Measurements of Nozzle Geometry and Hydraulic Behavior Atomization and Sprays 22 12 1011 1052 2012 10.1615/AtomizSpr.2013006309
- Lemmon , E.W. , McLinden , M.O. , and Friend , D.G. Thermophysical Properties of Fluid Systems NIST Chemistry WebBook, NIST Standard Reference Database Number 69 Linstrom , P.J. , and Mallard , W.G. National Institute of Standards and Technology http://webbook.nist.gov Jan. 2014
- Poling , B.E. , Prausnitz , J.M. , and O'Connell , J.P. The Properties of Gases and Liquids Mcgraw-Hill Professional 0-07-149999-7 2000
- ECN2 Proceedings http://www.sandia.gov/ecn/workshop/ECN2.php Jan. 2014
- Crua , C. and Heikal , M.R. Dropsizing of Near-Nozzle Diesel and RME Sprays by Microscopic Imaging Triennial International Conference on Liquid Atomization and Spray Systems Heidelberg, Germany September 2 6 2012
- Desjardins , O. , Blanquart , G. , Balarac , G. , and Pitsch , H. High order conservative finite difference scheme for variable density low Mach number turbulent flows Journal of Computational Physics 227 15 7125 7159 2008 10.1016/j.jcp.2008.03.027
- Falgout , R.D. , Jones , J.E. , Yang , U.M. Pursuing scalability for hypre's conceptual interfaces ACM Transactions on Mathematical Software 31 3 326 350 2005
- Falgout , R.D. , Jones , J.E. , Yang , U.M. The Design and Implementation of hypre, a Library of Parallel High Performance Preconditioners Numerical Solution of Partial Differential Equations on Parallel Computers Bruaset , A.M. and Tveito , A. Springer-Verlag 51 267 294 2006
- Balewski , B. Experimental investigation of the influence of nozzle-flow properties on the primary spray breakup Ph.D. Thesis Department of Mechanical Engineering, Technische Universität Darmstadt Darmstadt 2009
- Le Chenadec , V.H.M. A stable and conservative framework for detailed numerical simulation of primary atomization Ph.D. Thesis Department of Mechanical Engineering, Stanford University Stanford 2012