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Turbocompounding the Opposed-Piston 2-Stroke Engine
Technical Paper
2021-01-0636
ISSN: 0148-7191, e-ISSN: 2688-3627
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SAE WCX Digital Summit
Language:
English
Abstract
This paper presents analytical research conducted into the level of fuel consumption improvement that can be expected from turbocompounding a medium-duty opposed-piston 2-stroke engine, which is part of a hybridized vehicle propulsion system. It draws on a successful earlier study which showed a non-compounded opposed-piston engine to be clearly superior to other forms of 2-stroke engine, such as the widely adopted uniflow-scavenged poppet valve configuration. Electrical power transmission is proposed as the method of providing the necessary variable-speed drive to transmit excess turbine power to the system energy storage medium. The work employs one-dimensional engine simulation on a single-cylinder basis, using brake specific fuel consumption (BSFC) as the reportable metric, coupled with positive or negative power flow to the engine from the compounder; this is a variation on an approach successfully used in earlier work. Here it shows the sensitivities of the overall system to cylinder pressure, the compressor and turbine efficiencies, exhaust backpressure and also provides a means to investigate the effect of the power transmission efficiency on the overall benefit. Reheating the air before the turbine is also investigated as a means of providing a “burst” performance facility, albeit at the expense of extra fuel consumption. Positive compounding work is shown to be achievable across all investigated engine operating points under certain conditions. Operating points at lower engine speeds showed an increased propensity for turbocompounding, with 5-6% of the brake torque arising from the compounder, compared to those at higher engine speeds, where a maximum of 4% was seen. BSFC was found to be highly dependent on compounding torque with improvements only arising from reducing backpressure. A better understanding of the flow restrictions of the exhaust aftertreatment and muffler systems, for a given application, would allow for more accurate determination of the possibility for BSFC reduction within realistic operating conditions.
Authors
Topic
Citation
Young, A., Turner, J., and Head, R., "Turbocompounding the Opposed-Piston 2-Stroke Engine," SAE Technical Paper 2021-01-0636, 2021, https://doi.org/10.4271/2021-01-0636.Data Sets - Support Documents
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References
- Jones , L. Sectioned drawings of Piston Aero Engines, Historical Series Special Edition Derby, UK Rolls-Royce Heritage Trust 1995 1 872922 07 4
- Pearce , W. Junkers Jumo 223 Aircraft Engine Old Machine Press https://oldmachinepress.com/2015/09/26/junkers-jumo-223-aircraft-engine/ 2020
- Pearce , W. Junkers Jumo 224 Aircraft Engine Old Machine Press https://oldmachinepress.com/2015/10/03/junkers-jumo-224-aircraft-engine/ 2020
- Regner , G. , Herold , R.E. , Wahl , M.H. , Dion , E. et al. The Achates Power Opposed-Piston Two-Stroke Engine: Performance and Emissions Results in a Medium-Duty Application SAE Int. J. Engines 4 3 2726 2735 2011 10.4271/2011-01-2221.
- Redon , F. , Kalebjian , C. , Kessler , J. , Rakovec , N. et al. Meeting Stringent 2025 Emissions and Fuel Efficiency Regulations with an Opposed-Piston, Light-Duty Diesel Engine SAE Technical Paper 2014-01-1187 2014 10.4271/2014-01-1187.
- Sharma , A. , and Redon , F. Multi-Cylinder Opposed-Piston Engine Results on Transient Test Cycle SAE Technical Paper 2016-01-1019 2016 10.4271/2016-01-1019.
- Naik , S. , Johnson , D. , Fromm , L. , Koszewnik , J. et al. Achieving Bharat Stage VI Emissions Regulations While Improving Fuel Economy with the Opposed-Piston Engine SAE Int. J. Engines 10 1 17 26 2017 10.4271/2017-26- 0056.
- Witzky , J. , Meriwether , R. , and Lux , F. Piston-Turbine-Compound Engine — A Design and Performance Analysis SAE Technical Paper 650632 1965 10.4271/650632
- Nahum , A. , Foster-Pegg , R.W. , and Birch , D. The Rolls-Royce Crecy, Rolls-Royce Heritage Trust Historical Series No. 21 Derby, UK Rolls-Royce Heritage Trust 1994 1 872922 05 8
- Chatterton , E. The Napier Deltic Diesel Engine SAE Technical Paper 560038 1956 10.4271/560038.
- Aghaali , H. , and Ångström , H. A Review of Turbocompounding as a Waste Heat Recovery System for Internal Combustion Engines Renewable and Sustainable Energy Reviews 49 813 824 2015 10.1016/j.rser.2015.04.144
- Wei , W. , Zhuge , W. , Zhang , Y. , and He , Y. Comparative Study on Electric Turbo-Compounding Systems for Gasoline Engine Exhaust Energy Recovery Proceedings of the ASME Turbo Expo 2010: Power for Land, Sea, and Air. Volume 5: Industrial and Cogeneration; Microturbines and Small Turbomachinery; Oil and Gas Applications; Wind Turbine Technology Glasgow, UK June 14-18 2010 531 539 10.1115/GT2010-23204
- Kant , M. , Romagnoli , A. , Mamat , A.M. , and Martinez-Botas , R. F. Heavy-Duty Engine Electric Turbocompounding Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 229 2015 457 72 10.1177/0954407014547237
- Turner , J.W.G. , Head , R.A. , Chang , J. , Engineer , N. et al. 2-Stroke Engine Options for Automotive Use: A Fundamental Comparison of Different Potential Scavenging Arrangements for Medium-Duty Truck Applications SAE Technical Paper 2019-01-0071 2019 10.4271/2019-01-0071.
- Badra , J.A. , Sim , J. , Elwardany , A. , Jaasim , M. et al. Numerical Simulations of Hollow-Cone Injection and Gasoline Compression Ignition Combustion with Naphtha Fuels Journal of Energy Resources Technology 138 5 2016 10.1115/1.4032622.
- Mattarelli , E. , Rinaldini , C. , Savioli , T. , Cantore , G. et al. Scavenge Ports Optimization of a 2-Stroke Opposed Piston Diesel Engine SAE Technical Paper 2017-24-0167 2017 10.4271/2017-24-0167.
- Subramaniam , M. Pre-turbo After-treatment System Development using a 1D Modeling Approach https://www.fev.com/fileadmin/user_upload/Media/TechnicalPublications/Diesel_Systems/PreturboAfterTreatmentSystemwitha1DModelingApproach.pdf
- https://www.aecc.eu/emissions-control-technology/catalysts/
- Parsons , D. The Effect of Post-Catalyst Exhaust Gas Recirculation on Combustion in Highly Rated SI Engines 2020
- Kalghatgi , G. , Risberg , P. , and Ångström , H. Advantages of Fuels with High Resistance to Auto-Ignition in Late-Injection, Low-Temperature, Compression Ignition Combustion SAE Technical Paper 2006-01-3385 2006 10.4271/2006-01-3385.
- Kalghatgi , G. , and Johansson , B. Gasoline Compression Ignition Approach to Efficient, Clean and Affordable Future Engines, Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 232 1 118 138 January 2018 10.1177/0954407017694275
- Agarwal , A.K. , Singh , A.P. , and Maurya , R.K. Evolution, Challenges and Path forward for Low Temperature Combustion Engines Progress in Energy and Combustion Science 61 1 56 2017 org/10.1016/j.pecs.2017.02.001
- AlAbbad , M. , Badra , J. , Djebbi , K. , and Farooq , A. Ignition Delay Measurements of a Low-octane Gasoline Blend, Designed for Gasoline Compression Ignition (GCI) Engines Proceedings of the Combustion Institute 37 1 2019 171 178 org/10.1016/j.proci.2018.05.097
- He , X. , Donovan , M.T. , Zigler , B.T. , Palmer , T.R. et al. An Experimental and Modeling Study of iso-octane Ignition Delay Times Under Homogeneous Charge Compression Ignition Conditions Combustion and Flame 142 3 2005 266 275 0010-2180 10.1016/j.combustflame.2005.02.014
- Regner , G. , Redon , F. , Koszewnik , J. and Fromm , L. et al. Achieving the Most Stringent CO2 Commercial Truck Standards with Opposed Piston Engine https://achatespower.com/wp-content/uploads/2019/12/MTZ_2014_Final.pdf
- Yoshizawa , K. , Teraji , A. , Miyakubo , H. , Yamaguchi , K. et al. Study of High Load Operation Limit Expansion for Gasoline Compression Ignition Engines ASME. J. Eng. Gas Turbines Power 128 2 377 387 April 2006 10.1115/1.1805548.
- Liu , H. , Mao , B. , Liu , J. , Zheng , Z. et al. Pilot Injection Strategy Management of Gasoline Compression Ignition (GCI) Combustion in a Multi-Cylinder Diesel Engine Fuel 221 116 127 2018 10.1016/j.fuel.2018.01. 073