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Piston Bowl Geometry Effects on Combustion Development in a High-Speed Light-Duty Diesel Engine
Technical Paper
2019-24-0167
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In this work we studied the effects of piston bowl design on combustion in a small-bore direct-injection diesel engine. Two bowl designs were compared: a conventional, omega-shaped bowl and a stepped-lip piston bowl. Experiments were carried out in the Sandia single-cylinder optical engine facility, with a medium-load, mild-boosted operating condition featuring a pilot+main injection strategy. CFD simulations were carried out with the FRESCO platform featuring full-geometric body-fitted mesh modeling of the engine and were validated against measured in-cylinder performance as well as soot natural luminosity images. Differences in combustion development were studied using the simulation results, and sensitivities to in-cylinder flow field (swirl ratio) and injection rate parameters were also analyzed. In-cylinder mixture formation analysis showed that ignition of the pilot injection mixture develops nearly as it would in a homogeneous adiabatic reactor, being mostly advected, not mixed, by the bowl’s swirling motion, while its timing is influenced by the local flow field. Details of the local in-cylinder flow are also more crucial than injection parameters in igniting the main injection’s premixed fuel, as it determines the relative overlap with the high-temperature pilot ignited mixture. Bowl geometry effects drive diffusive and late-cycle combustion, as structural differences of the main injection spray flames appear due to the different impact geometries at the piston bowl rim. However, these do not affect wall heat transfer significantly: it is dominated by the piston surface area. Better air utilization with the stepped-lip geometry, thanks to greater azimuthal spreading at the rim, a strong recirculating vortex in the squish region, and better mixing in the bowl, is responsible for better late-cycle combustion efficiency and lower soot emissions.
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Citation
Perini, F., Busch, S., Zha, K., Reitz, R. et al., "Piston Bowl Geometry Effects on Combustion Development in a High-Speed Light-Duty Diesel Engine," SAE Technical Paper 2019-24-0167, 2019, https://doi.org/10.4271/2019-24-0167.Data Sets - Support Documents
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References
- Styron , J. , Baldwin , B. , Fulton , B. , Ives , D. et al. Ford 2011 6.7L Power Stroke® Diesel Engine Combustion System Development SAE Technical Paper 2011-01-0415 2011 10.4271/2011-01-0415
- Miles , P.C. , Rempel Ewert , B.H. , and Reitz , R.D. Squish-Swirl and Injection-Swirl Interaction in Direct-Injection Diesel Engines ICE2003 6th International Conference on Engines for Automobiles Capri, Italy 2003
- Perini , F. , Zha , K. , Busch , S. , Kurtz , E. , Peterson , R.C. , Warey , A. and Reitz , R.D. Piston Geometry Effects in a Light-Duty, Swirl-Supported Diesel Engine: Flow Structure Characterization International Journal of Engine Research 2017
- Kurtz , E. and Styron , J. An Assessment of Two Piston Bowl Concepts in a Medium-Duty Diesel Engine SAE Int. J. Engines 5 2 344 352 2012 10.4271/2012-01-0423
- Miles , P.C. and Andersson , O. A Review of Design Considerations for Light-Duty Diesel Combustion Systems International Journal of Engine Research 17 1 6 15 2016
- Wickman , D.D. , Yun , H. , and Reitz , R.D. Split-Spray Piston Geometry Optimized for HSDI Diesel Engine Combustion SAE Technical Paper 2003-01-0348 2003 10.4271/2003-01-0348
- Dolak , J.G. , Shi , Y. , and Reitz , R.D. A Computational Investigation of Stepped-Bowl Piston Geometry for a Light Duty Engine Operating at Low Load SAE Technical Paper 2010-01-1263 2010 10.4271/2010-01-1263
- Yoo , D. , Kim , D. , Jung , W. , Kim , N. et al. Optimization of Diesel Combustion System for Reducing PM to Meet Tier4-Final Emission Regulation without Diesel Particulate Filter SAE Technical Paper 2013-01-2538 2013 10.4271/2013-01-2538
- Eder , T. , Luckert , P. , Kemmner , M. , and Sass , H. OM654-Launch of a New Engine Family by Mercedes-Benz MTZ Worldwide 77 3 60 67 2016
- Li , X. , Sun , Z. , Du , W. , and Wei , R. Research and Development of Double Swirl Combustion System for a DI Diesel Engine Combustion Science and Technology 182 8 1029 1049 2010
- Busch , S. , Zha , K. , Kurtz , E. , Warey , A. et al. Experimental and Numerical Studies of Bowl Geometry Impacts on Thermal Efficiency in a Light-Duty Diesel Engine SAE Technical Paper 2018-01-0228 2018 10.4271/2018-01-0228
- Busch , S. , Zha , K. , Perini , F. , Reitz , R.D. et al. Bowl Geometry Effects on Turbulent Flow Structure in a Direct Injection Diesel Engine SAE Technical Paper 2018-01-1794 2018 10.4271/2018-01-1794
- Perini , F. and Reitz , R.D. FRESCO - An Object-Oriented, Parallel Platform for Internal Combustion Engine Simulations 28th International Multidimensional Engine Modeling User's Group Meeting at the SAE Congress Detroit 2018
- Perini , F. , Busch , S. , Zha , K. , and Reitz , R.D. Comparison of Linear, Non-Linear and Generalized RNG-Based k-epsilon Models for Turbulent Diesel Engine Flows SAE Technical Paper 2017-01-0561 2017 10.4271/2017-01-0561
- Perini , F. and Reitz , R.D. Improved Atomization, Collision and Sub-Grid Scale Momentum Coupling Models for Transient Vaporizing Engine Sprays International Journal of Multiphase Flows 79 107 123 2016
- ECN Data Search Page https://ecn.sandia.gov/ecn-data-search/ 2018
- Busch , S. Light-Duty Diesel Combustion DOE Vehicle Technologies Office and Hydrogen and Fuel Cells Program Annual Merit Review Washington, DC 2017
- Perini , F. , Galligani , E. , and Reitz , R.D. A study of direct and Krylov Iterative Solver Techniques to Approach Linear Scaling of the Integration of Chemical Kinetics with Detailed Combustion Mechanims Combustion and Flame 161 5 1180 1195 2014
- Perini , F. , Galligani , E. , and Reitz , R.D. An Analytical Jacobian Approach to Sparse Reaction Kinetics for Computationally Efficient Combustion Modelling with Large Reaction Mechanisms Energy&Fuels 26 8 4804 4822 2012
- Perini , F. High-Dimensional, Unsupervised Cell Clustering for Computationally Efficient Engine Simulations with Detailed Combustion Chemistry Fuel 106 344 356 2012
- Perini , F. , Das Adhikary , B. , Lim , J.-H. , Su , X. et al. Improved Chemical Kinetics Numerics for the Efficient Simulation of Advanced Combustion Strategies SAE Int. J. Engines 7 1 243 255 2014 10.4271/2014-01-1113
- Radhakrishnan , K. and Hindmarsh , A.C. Description and Use of LSODE, the Livermore Solver for Ordinary Differential Equations Cleveland, OH NASA Lewis Research Center 1993
- Ra , Y. and Reitz , R.D. A Combustion Model for IC Engine Combustion Simulations with Multi-Component Fuels Combustion and Flame 158 1 69 90 2011
- Wang , B.-L. , Miles , P.C. , Reitz , R.D. , and Han , Z. Assessment of RNG Turbulence Modeling and the Development of a Generalized RNG Closure Model SAE Technical Paper 2011-01-0829 2011 10.4271/2011-01-0829
- Reitz , R.D. and Bracco , F.V. On the Dependence of Spray Angle and Other Spray Parameters on Nozzle Design and Operating Conditions SAE Technical Paper 790494 1979 10.4271/790494
- Beale , J.C. and Reitz , R.D. Modeling Spray Atomization with the Kelvin-Helmholtz/Reyleigh-Taylor Hybrid Model Atomization and Sprays 19 7 623 650 1999
- Munnannur , A. and Reitz , R.D. Comprehensive Collision Model for Multidimensional Engine Spray Computations Atomization and Sprays 9 6 597 619 2009
- Torres , D.J. , O'Rourke , P.J. , and Trujillo , M.F. A Discrete Multicomponent Fuel Model Atomization and Sprays 13 2&3 42 2003
- Perini , F. , Dempsey , A.B. , Reitz , R.D. , Sahoo , D. et al. A Computational Investigation of the Effects of Swirl Ratio and Injection Pressure on Mixture Preparation and Wall Heat Transfer in a Light-Duty Diesel Engine SAE Technical Paper 2013-01-1105 2013 10.4271/2013-01-1105
- Busch , S. and Miles , P.C. Parametric Study of Injection Rates With Solenoid Injectors in an Injection Quantity and Rate Measuring Device ASME Paper No. ICEF2014-5583 Columbus, Indiana, USA 2015
- Small-Bore Diesel Engine https://ecn.sandia.gov/engines/engine-facilities/small-bore-diesel-engine/ 2018
- Perini , F. , Reitz , R.D. , and Miles , P.C. A Comprehensive Modeling Study of in-Cylinder Fluid Flows in a High-Swirl, Light-Duty Optical Diesel Engine Computers and Fluids 105 113 124 2014
- Perini , F. , Busch , S. , Kurtz , E. , Warey , A. et al. Limitations of Sector Mesh Geometry and Initial Conditions to Model Flow and Mixture Formation in Direct-Injection Diesel Engines SAE Technical Paper 2019-01-0204 2019 10.4271/2019-01-0204
- Zha , K. , Busch , S. , Warey , A. , Peterson , R.C. et al. A Study of Piston Geometry Effects on Late-Stage Combustion in a Light-Duty Optical Diesel Engine Using Combustion Image Velocimetry SAE Int. J. Engines 11 6 783 804 2018 10.4271/2018-01-0230
- Hessel , R.P. , Reitz , R.D. , Musculus , M.P. B. , O'Connor , J. et al. A CFD Study of Post Injection Influences on Soot SAE Int. J. Engines 7 2 694 713 2014 10.4271/2014-01-1256
- Mueller , C.J. The Quantification of Mixture Stoichiometry When Fuel Molecules Contain Oxidizer Elements or Oxidizer Molecules Contain Fuel Elements SAE Technical Paper 2005-01-3705 2005 10.4271/2005-01-3705
- Perini , F. , Hiraoka , K. , Nomura , K. , Yuuki , A. et al. An Efficient Level-Set Flame Propagation Model for Hybrid Unstructured Grids using the G-Equation SAE Int. J. Engines 9 3 1409 1424 2016 10.4271/2016-01-0582
- Perini , F. , Busch , S. , and Reitz , R.D. A Phenomenological Rate of Injection Model for Predicting Fuel Injection with Application to Mixture Formation in Light-Duty Diesel Engines Proc. IMechE Part D: Journal of Automobile Engineering 29
- Zhu , G. , Pattabiraman , K. , Perini , F. , and Rutland , C.J. Modeling Ignition and Combustion in Spark-Ignition Engines Based on Swept-Volume Method SAE Technical Paper 2018-01-0188 2018 10.4271/2018-01-0188
- Han , Z. and Reitz , R.D. A Temperature Wall Function Formulation for Variable-Density Turbulent Flows with Application to Engine Convective Heat Transfer Modeling International Journal of Heat and Mass Transfer 40 3 613 625 1997
- Fridriksson , H.S. , Tuner , M. , Andersson , O. , Sunden , B. et al. Effect of Piston Bowl Shape and Swirl Ratio on Engine Heat Transfer in a Light-Duty Diesel Engine SAE Technical Paper 2014-01-1141 2014 10.4271/2014-01-1141
- Perini , F. , Zha , K. , Busch , S. , Miles , P.C. et al. Principal Component Analysis and Study of Port-Induced Swirl Structures in a Light-Duty Optical Diesel Engine SAE Technical Paper 2015-01-1696 2015 10.4271/2015-01-1696