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Preliminary Development of a 30 kW Heavy Fueled Compression Ignition Rotary ‘X’ Engine with Target 45% Brake Thermal Efficiency
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 03, 2018 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
This paper presents initial progress in the development of LiquidPiston’s ‘X4’, a 30 kW heavy-fueled rotary compression ignition engine prototype. The X4 is the newest version of the unique rotary ‘X’ engine architecture. This development is partially funded by the Defense Advanced Research Projects Agency (DARPA), with broad dual-use civilian / military applications including UAVs, generators, and for propulsion. The 30 kW size may be of significant interest in the automotive application as a range extender for Electric Vehicles. The final performance objectives of the program are aggressive: 45% brake thermal efficiency; > 1 hp / lb power-to-weight; and the engine is targeted to fit within a 10”x10”x10” box weighing <40lbs.
A first prototype engine “core” has been designed, analyzed, prototypes, and completed its initial testing. This stage of development has focused on verifying the structural integrity of the main engine components including the shaft, bearing, rotor and gears, as well as the function of the engine’s gas seals, at the high pressures (in excess of 100 bar) expected of a CI engine.
Motoring results from initial testing show reasonable agreement to 1D performance modeling. The engine has exceeded the mechanical verification target, demonstrating stable operation with in-cylinder pressures of 150 bar. This paper will summarize the design and preliminary experimental results achieved in the first year of development, including:
- 1D thermodynamic Modeling
- Design considerations of the main engine components including the crank shaft, bearings, gears, combustion system
- Initial Testing to verify system integrity
With the X4 “core engine” structure and gas seals validated, future work is discussed, which will include performance optimization to achieve power and efficiency objectives.
- Mark Nickerson - LiquidPiston
- Alexander Kopache - LiquidPiston
- Alexander Shkolnik - LiquidPiston
- Kyle Becker - LiquidPiston
- Nikolay Shkolnik - LiquidPiston
- Michael Bergin - LiquidPiston
- Adam Spitulnik - LiquidPiston
- Konstantin Mikhailov - LiquidPiston
- Rodrigo Equiluz - LiquidPiston
- Ryan Fagan - LiquidPiston
- Saad ahmed - LiquidPiston
- Sean Donnelly - LiquidPiston
- Tiago Costa - LiquidPiston
CitationNickerson, M., Kopache, A., Shkolnik, A., Becker, K. et al., "Preliminary Development of a 30 kW Heavy Fueled Compression Ignition Rotary ‘X’ Engine with Target 45% Brake Thermal Efficiency," SAE Technical Paper 2018-01-0885, 2018, https://doi.org/10.4271/2018-01-0885.
Data Sets - Support Documents
|Unnamed Dataset 1|
- Shkolnik , N. and Shkolnik , A. Rotary High Efficiency Hybrid Cycle Engine SAE Technical Paper 2008-01-2448 2008 10.4271/2008-01-2448
- Shkolnik , A. , Littera , D. , Nickerson , M. , Shkolnik , N. et al. Development of a Small Rotary SI/CI Combustion Engine SAE Technical Paper 2014-32-0104 2014 10.4271/2014-32-0104
- Littera , D. , Kopache , A. , Machamada Sun , C. et al. Development of the XMv3 High Efficiency Cycloidal Engine SAE Technical Paper 2015-32-0719
- Wankel , Felix 1961
- Blair , G.P. Design and Simulation of Four-Stroke Engines Warrandale, PA SAE International 1999
- Heywood , J.B. Internal Combustion Engine Fundamentals New York McGraw-Hill 1988
- Atkins , R.D. An Introduction to Engine Testing and Development Warrandale, PA SAE International 2009
- Leboeuf , M. , Picard , M. , Shkolnik , A. , Shkolnik , N et al Performance of a Low Blowby Sealing System for a High Efficiency Rotary Engine SAE Technical Paper 2018-01-0372