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Experimental and Numerical Studies of Bowl Geometry Impacts on Thermal Efficiency in a Light-Duty Diesel Engine
Technical Paper
2018-01-0228
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In light- and medium-duty diesel engines, piston bowl shape influences thermal efficiency, either due to changes in wall heat loss or to changes in the heat release rate. The relative contributions of these two factors are not clearly described in the literature. In this work, two production piston bowls are adapted for use in a single cylinder research engine: a conventional, re-entrant piston, and a stepped-lip piston. An injection timing sweep is performed at constant load with each piston, and heat release analyses provide information about thermal efficiency, wall heat loss, and the degree of constant volume combustion. Zero-dimensional thermodynamic simulations provide further insight and support for the experimental results. The effect of bowl geometry on wall heat loss depends on injection timing, but changes in wall heat loss cannot explain changes in efficiency. Late cycle heat release is faster with the stepped-lip bowl than with the conventional re-entrant bowl, which leads to a higher degree of constant volume combustion and therefore higher thermal efficiency. This effect also depends on injection timing. In general, increasing the degree of constant volume combustion is significantly more effective at improving thermal efficiency than decreasing wall heat loss. Maximizing thermal efficiency will require a deeper understanding of how bowl geometry impacts flow structure, turbulent mixing, and mixing-controlled combustion.
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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, https://doi.org/10.4271/2018-01-0228.Data Sets - Support Documents
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References
- Kurtz , E.M. 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
- Crosse , J. Going Clean - off Highway Ricardo Quarterly Review 2010
- Zha , K. , Busch , S. , Warey , A. , Peterson , R. and Kurtz , E. A Study of Piston Geometry Effects on Late-Stage Combustion in a Light-Duty Diesel Engine Using Combustion Image Velocimetry 2018 SAE World Congress
- 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
- Styron , J. , Baldwin , B. , Fulton , B. , Ives , D. , and Ramanathan , S. Ford 2011 6.7L Power Stroke® Diesel Engine Combustion System Development SAE Technical Paper 2011-01-0415 2011 10.4271/2011-01-0415
- Yoo , D. , Kim , D. , Jung , W. , Kim , N. , and Lee , D. 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. , Lückert , P. , Kemmner , M. , and Sass , H. OM654 - Launch of a New Engine Family by Mercedes-Benz MTZ Worldwide 77 3 60 67 2016
- Kogo , T. , Hamamura , Y. , Nakatani , K. , Toda , T. et al. High Efficiency Diesel Engine with Low Heat Loss Combustion Concept - Toyota’s Inline 4-Cylinder 2.8-Liter ESTEC 1GD-FTV Engine SAE Technical Paper 2016-01-0658 2016 10.4271/2016-01-0658
- Andersson , Ö. and Miles , P.C. Diesel and Diesel LTC Combustion Encyclopedia of Automotive Engineering John Wiley & Sons, Ltd 2014 10.1002/9781118354179.auto120
- Nishida , K. , Hashizume , T. , Hasegawa , R. , and Ogawa , T. Low Cooling Losses and Low Emission Analysis of Small Bore Diesel Engine Combustion SAE Technical Paper 2015-01-1824 2015 10.4271/2015-01-1824
- 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
- Assessment of Fuel Economy Technologies for Light-Duty Vehicles The National Academies Press 2011 10.17226/12924
- Stone , R. Introduction to Internal Combustion Engines New York Palgrave Macmillan 2012
- Iikubo , S. , Nakajima , H. , Adachi , Y. , and Shimokawa , K. 2012
- Petersen , B.R. , Ekoto , I.W. , and Miles , P.C. An Investigation into the Effects of Fuel Properties and Engine Load on UHC and CO Emissions from a Light-Duty Optical Diesel Engine Operating in a Partially Premixed Combustion Regime SAE Int. J. Engines 3 2 38 55 2010 10.4271/2010-01-1470
- Sahoo , D. , Miles , P.C. , Trost , J. , and Leipertz , A. The Impact of Fuel Mass, Injection Pressure, Ambient Temperature, and Swirl Ratio on the Mixture Preparation of a Pilot Injection SAE Int. J. Engines 6 3 1716 1730 2013 10.4271/2013-24-0061
- Zha , K. , Busch , S. , Miles , P.C. , Wijeyakulasuriya , S. et al. Characterization of Flow Asymmetry during the Compression Stroke Using Swirl-Plane PIV in a Light-Duty Optical Diesel Engine with the Re-entrant Piston Bowl Geometry SAE Int. J. Engines 8 4 1837 1855 2015 10.4271/2015-01-1699
- Xu , H. Some Critical Technical Issues on the Steady Flow Testing of Cylinder Heads SAE Technical Paper 2001-01-1308 2001 10.4271/2001-01-1308
- Busch , S. and Miles , P.C. Parametric Study of Injection Rates with Solenoid Injectors in an Injection Quantity and Rate Measuring Device Journal of Engineering for Gas Turbines and Power 137 10 101503 101503 2015 10.1115/1.4030095
- Kashdan , J.T. and Bruneaux , G. Laser-Induced Phosphorescence Measurements of Combustion Chamber Surface Temperature on a Single-Cylinder Diesel Engine SAE Technical Paper 2011-01-2049 2011 10.4271/2011-01-2049
- Heywood , J.B. Internal Combustion Engine Fundamentals New York McGraw-Hill 1988
- Shudo , T. and Nabetani , S. Analysis of Degree of Constant Volume and Cooling Loss in a Hydrogen Fuelled SI Engine SAE Technical Paper 2001-01-3561 2001 10.4271/2001-01-3561
- Stanton , D.W. Systematic Development of Highly Efficient and Clean Engines to Meet Future Commercial Vehicle Greenhouse Gas Regulations SAE International Journal of Engines 6 3 1395 1480 2013 10.4271/2013-01-2421
- Busch , S. , Zha , K. , Miles , P.C. , Warey , A. et al. Experimental and Numerical Investigations of Close-Coupled Pilot Injections to Reduce Combustion Noise in a Small-Bore Diesel Engine SAE Int. J. Engines 8 2 660 678 2015 10.4271/2015-01-0796
- Lanzafame , R. and Messina , M. V Order Logarithmic Polynomials for Thermodynamic Calculations in ICE SAE Technical Paper 2001-01-1912 2001 10.4271/2001-01-1912