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The Be-Rex Engine-Generator: A Revolutionary Two-Stroke, Lightweight and Cost-Efficient Singular Unit
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 11, 2023 by SAE International in United States
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Although electricity is necessary for a country's economic development, many countries lack suitable grid infrastructure. Portable generators offer a consistent electric supply in the event of a blackout.
Be-Rex B.V. develops and already assembled a revolutionary engine-generator prototype. It eliminates the use of camshafts, crankshafts and flywheels while integrating the generator parts into the same spherical housing. Thus, it constitutes a compact, lightweight and cost-efficient singular unit. There is no mechanical power output while the load of the engine is determined by the demanded load of the generator. The four combustion chambers are arranged in pairs on the north and south hemisphere and the magnets of the stator are placed circumferential at the equator of the spherical housing. The rotating disc and the joiner build the rotor of the generator. While developing the engine special emphasis has been put on its multi-fuel capability. Optimized gas exchange together with an efficient scavenging concept and the combustion system allow the atmospheric version of the prototype with a displacement volume of 400 cc to achieve 10 bar of indicated mean effective pressure (imep) when running on gasoline. Using 1-D WAVE simulations the same atmospheric version converted to ammonia fuel achieves 8 bar of imep.
First firing results of an engine generator prototype running on gasoline solidify the proof of concept. In the design section the main characteristics of the concept will be highlighted and the working principle will be explained. In the modelling approach section the methodology to tackle the leakage and the friction issues will be presented before the main results of the final design optimization will be discussed. Afterwards, the first experimental runs will be analyzed and finally some possible applications will be addressed.
CitationBekking, P., Puts, G., Spiller, M., and Bikas, G., "The Be-Rex Engine-Generator: A Revolutionary Two-Stroke, Lightweight and Cost-Efficient Singular Unit," SAE Technical Paper 2023-01-0399, 2023, https://doi.org/10.4271/2023-01-0399.
- Thompson , G.J. , Wowczuk , Z.S. , and Smith , J.E. Rotary Engines – A Concept Review SAE Technical Paper 2003-01-3206 2003 https://doi.org/10.4271/2003-01-3206
- Warren , S. and Yang , D.C.H. Design of Rotary Engines from the Apex Seal Profile Mech Mach Theory 64 2013 200 209 https://doi.org/10.1016/j.mechmachtheory.2013.01.015
- Shkolnik , A. , Littera , D. , Nickerson , M. , Cho , K. et al. Development of a Small Rotary SI/CI Combustion Engine SAE Technical Paper 2014-32-0104 2014 https://doi.org/10.4271/2014-32-0104
- Wu , W. , Lin , Y. , and Chow , L. A Heat Pipe Assisted Air-Cooled Rotary Wankel Engine for Improved Durability, Power and Efficiency SAE Technical Paper 2014-01-2160 2014 https://doi.org/10.4271/2014-01-2160
- Shkolnik , A. , et al. Compact, Lightweight, High Efficiency Rotary Engine for Generator, APU, and Range-extended Electric Vehicles Proceedings of the NDIA Ground Vehicle Systems Engineering and Technology Symposium, Power & Mobility Technical Session Novi, MI, USA 2018
- Peden , M. , Turner , M. , Turner , J.W.G. , and Bailey , N. Comparison of 1-D Modelling Approaches for Wankel Engine Performance Simulation and Initial Study of the Direct Injection Limitations SAE Technical Paper 2018-01-1452 2018 https://doi.org/10.4271/2018-01-1452
- Tartakovsky , L. , Baibikov , V. , Gutman , M. , Veinblat , M. et al. Simulation of Wankel Engine Performance Using Commercial Software for Piston Engines SAE Technical Paper 2012-32-0098 2012 https://doi.org/10.4271/2012-32-0098
- Heywood , J.B. Internal Combustion Engine Fundamentals McGraw-Hill 1988
- Zavos , A. Effect of Coating and Low Viscosity Oils on Piston Ring Friction under Mixed Regime of Lubrication through Analytical Modelling Lubricants 9 2021 124 https://doi.org/10.3390/lubricants9120124
- Koehler , E. and Flierl , R. Verbrennungsmotoren Auflage Vieweg+Teubner 2009
- Picard , M. , Tian , T. , and Nishino , T. Predicting Gas Leakage in the Rotary Engine-Part II: Side Seals and Summary Journal of Engineering for Gas Turbines and Power 138 6 2016 https://doi.org/10.1115/1.4031874
- Michos , K.N. and Bikas , G. Quasi-Dimensional Multi-Zone Combustion Diagnostic Tool for SI Engines with Novel NOx and CO Emissions Models SAE Int. J. Adv. & Curr. Prac. In Mobility 2 4 2020 1818 1848 https://doi.org/10.4271/2020-01-0289