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Performance of a Low-Blowby Sealing System for a High Efficiency Rotary Engine
Technical Paper
2018-01-0372
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The X engine is a non-Wankel rotary engine that allies high power density and high efficiency by running a high-pressure Atkinson cycle at high speeds. The X engine overcomes the gas leakage issue of the Wankel engine by using two axially-loaded face seals that directly interface with three stationary radially-loaded apex seals per rotor. The direct-interfacing of the apex and face seals eliminates the need for corner seals of the typical Wankel engine, significantly reducing rotary engine blowby. This paper demonstrates the sealing performance that can be achieved by this new type of seal configuration for a rotary engine based on dynamics models and experiments. The dynamics models calculate the displacement and deformation of the face and apex seals for every crank angle using a time implicit solver. The gas leakage is then calculated from the position of the seals and pressure in the chambers and integrated over a rotor revolution. An “effective leakage orifice” area can be determined, to compare blowby between different engine types. Model results show that the X engine equivalent leakage area could be around 35% that of the leakage area of a similarly sized Wankel engine obtained from the same modeling method, which brings the X engine leakage closer to the piston engine’s leakage range. Initial experimental results support the findings from the model, as the X engine shows an equivalent leakage area of about 65% that of a scaled Wankel engine. This result demonstrates the potential of the X engine to achieve gas sealing improvements through additional seal development.
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Authors
- Maxime Leboeuf - Université de Sherbrooke
- Jean-François Dufault - Université de Sherbrooke
- Mark Nickerson - LiquidPiston Inc.
- Kyle Becker - LiquidPiston Inc.
- Alexander Kopache - LiquidPiston Inc.
- Nikolay Shkolnik - LiquidPiston Inc.
- Alexander Shkolnik - LiquidPiston Inc.
- Mathieu Picard - Université de Sherbrooke
Citation
Leboeuf, M., Dufault, J., Nickerson, M., Becker, K. et al., "Performance of a Low-Blowby Sealing System for a High Efficiency Rotary Engine," SAE Technical Paper 2018-01-0372, 2018, https://doi.org/10.4271/2018-01-0372.Also In
References
- L. Tartakovsky , V. Baibikov , M. Gutman , M. Veinblat , and J. Reif Simulation of Wankel Engine Performance Using Commercial Software for Piston Engines SAE International, Warrendale, PA, 2012-32-0098 Oct. 2012
- J. Spreitzer , F. Zahradnik , and B. Geringer 2015
- Picard , M. , Tian , T. , and Nishino , T. Predicting Gas Leakage in the Rotary Engine-Part I: Apex and Corner Seal Journal of Engineering for Gas Turbines and Power 138 6 2016
- 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
- Eberle , M.K. and Klomp , E.D. An Evaluation of the Potential Performance Gain from Leakage Reduction in Rotary Engines SAE Technical Paper 730117 1973
- Danieli , G.A. , Ferguson , C.R. , Heywood , J.B. , and Keck , J.C. Predicting the Emissions and Performance Characteristics of a Wankel Engine SAE Technical Paper 740186 1974
- T. J. Norman 1983
- Roberts , J.A. , Norman , T.J. , Ekchian , J.A. , and Heywood , J.B. Computer Models For Evaluating Premixed and Disc Wankel Engine Performance SAE Technical Paper 860613 1986
- Matsuura , K. , Kazuo , T. , and Watanabe , I. The Behavior of a Rotary Engine Apex Seal against the Trochoidal Surface Bull. JSME 21 161 1642 1651 1978
- Matsuura , K. , Terasaki , K. , and Watanabe , I. The Relative Behavior of a Rotary Engine Apex Seal to the Walls of a Slot Bull. JSME 19 137 1367 1375 1976
- Knoll , J. , Vilmann , C.R. , Schock , H.J. , and Strumpf , R.P. A Dynamic Analysis of Rotary Combustion Engine Seals SAE Technical Paper 840035 1984
- Orlandea , N.V. , Welnert , M.S. , and Keleher , D.B. Computer Simulation of the Rotary Engine Apex Seal System SAE Technical Paper 870410 1987
- Shkolnik , A. , Littera , D. , Nickerson , M. , Shkolnik , N. , and Cho , K. Development of a Small Rotary SI/CI Combustion Engine SAE Technical Paper, Warrendale, PA, SAE Technical Paper 2014-32-0104 Nov. 2014
- Shkolnik , N. and Shkolnik , A. Rotary High Efficiency Hybrid Cycle Engine SAE Tech. Pap. 01 2448 2008
- Nabours , S. , Shkolnik , N. , Nelms , R. , Gnanam , G. , and Shkolnik , A. High Efficiency Hybrid Cycle Engine SAE International, Warrendale, PA, 2010-01-1110 Apr. 2010
- Costa , T.J. et al. Measurement and Prediction of Heat Transfer Losses on the XMv3 Rotary Engine SAE International Journal of Engines 9 4 2368 2380 Nov. 2016
- Greenwood , J.A. and Tripp , J.H. The Contact of two Nominally Flat Rough Surfaces Proc. Inst. Mech. Eng. 185 1 625 633 Jun. 1970
- H. Chen 2011
- C. Baelden A Multi-Scale Model 2014
- Littera , D. et al. Development of the XMv3 High Efficiency Cycloidal Engine SAE Technical Paper, Warrendale, PA, SAE Technical Paper 2015-32-0719 Nov. 2015