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Development of Test Bench and Characterization of Performance in Small Internal Combustion Engines
Technical Paper
2013-32-9036
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English
Abstract
Small internal combustion engines (ICEs), (<7.5 kW), possess low thermal efficiencies due to high thermal losses. As the surface area to volume ratio increases beyond 1.5 cm2/cc, the increase in thermal losses leads to a drop off of engine efficiency and power. This effort describes the development and validation of a test stand to characterize thermal losses of small ICEs, optimize combustion phasing, and eventually enable heavy fuel operation. The test stand measures torque, rotational speed, brake power, intake air mass flow, up to 48 temperatures (including ambient, intake, cylinder head, fuel, and exhaust), 8 pressures (including ambient, intake, and exhaust), throttle position, and fuel and air mass flows. Intake air temperature and cylinder head temperature are controlled and adjustable. Three geometrically similar engines with surface area to volume ratios near 1.5 cm2/cc were selected from 3W Modellmotoren. During bench validation the 3W 55i engine's power, torque, brake specific fuel consumption, efficiency, and equivalence ratio were mapped in the stock configuration. The engine developed a peak power output of 2.1 kW at 7000 rpm, 54% of its manufacturer rated power. Additional tuning of the exhaust or carburetor may achieve manufacturer rated performance.
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Authors
- Joseph K. Ausserer - Air Force Research Laboratory, United States Air Force
- Paul J. Litke - Air Force Research Laboratory, United States Air Force
- Jon-Russell Groenewegen - University of Dayton Research Institute
- Alexander Rowton - Air Force Institute of Technology
- Marc Polanka - Air Force Institute of Technology
- Keith Grinstead - Innovative Scientific Solutions Inc.
Topic
Citation
Ausserer, J., Litke, P., Groenewegen, J., Rowton, A. et al., "Development of Test Bench and Characterization of Performance in Small Internal Combustion Engines," SAE Technical Paper 2013-32-9036, 2013, https://doi.org/10.4271/2013-32-9036.Also In
References
- Cadou C., Sookdeo T., Moulton N. and Leach T., “Performance Scaling and Measurement for Hydrocarbon Fueled Engines with Mass Less Than 1 kg,” AIAA's 1st Technical Conference and Workshop on Unmanned Aerospace Vehicles, 20-23 May 2002.
- Ausserer J. and Harmon F., “Integration, Validation, and Testing of a Hybrid-Electric Propulsions System for a Small Remotely-Piloted Aircraft,” 10th International Energy Conversion Engineering Conference, 30 July 2012.
- Menon S., Moulton N. and Cadou C., “Development of a Dynamometer for Measuring Small Internal-Combustion Engine Performance,” Journal of Propulsion and Power, vol. 23, no. 1, pp. 194-202, January-February 2007.
- Gierke D., “Part 1: Dynamometer and Engine Performance Analysis,” Flying Models, pp. 21-25, June 1973.
- Gierke D., “Part 2: Dynamometer and Engine Performance and Analysis,” Flying Models, pp. 38-47, July 1973.
- Gierke D., “Part 3: Dynamometer and Engine Performance Analysis,” Flying Models, pp. 38-47, August 1973.
- Drela M., “QPROP Documents: DC Motor/Propeller Matching,” Massachusetts Institute of Technology, Boston, MA, 2005.
- Cadou C. and Menon S., “Scaling of Losses in Small IC and Aero Engines with Engine Size,” 42nd AIAA Aerospace Sciences Meeting and Exhibit, 5-8 January 2004.
- Menon S., “Performance Measurement and Scaling in Small Internal Combustion Engines,” University of Maryland, 2006.
- Moulton N., “Performance Measurement and Simulation of a Small Internal Combustion Engine,” University of Maryland, 2007.
- Cadou C., Moulton N. and Menon S., “Performance Measurement and Scaling in Small Internal Combustion Engines,” 41st Aerospace Sciences Meeting and Exhibit, 6-9 January 2003.
- Baranski J. A., Fernelius M. H., Hoke J. L., Wilson C. W. and Litke P. J., “Characterization of Propeller Performance and Engine Mission Matching for Small Remotely Piloted Aircraft,” 47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2011.
- Wiegand A., Miers S., Blough J., Kowalski D. and Biske A., “Development of a Micro-Engine Testing System,” SAE International, 23 October 2012.
- Heywood J. B., Internal Combustion Engine Fundamentals, New York: McGraw-Hill, 1988.
- 3W Modellmotoren, “Engine Manual 3W 85XI/85XI TS/ CS - series,” 2013. [Online]. Available: www.modellmotoren.com. [Accessed 5 April 2013].
- 3W Modellmotoren, “Engine Manual 55i / 55i CS,” 2013. [Online]. Available: www.3wmodellmotoren.com. [Accessed 5 April 2013].
- 3W Modellmotoren, “Engine Manual 24i-28i / CS,” 2013. [Online]. Available: www.3wmodellmotoren.com. [Accessed 5 April 2013].
- Heywood J. B. and Sher E., The Two-Stroke Cycle Engine: Its Development, Operation, and Design, New York, NY: Taylor and Francis Group, 1999.
- Coordinating Research Council, Inc., “Handbook of Aviation Fuel Properties,” Alpharetta, GA, 2003.
- Magtrol, WB and PS Series Eddy-Current and Magnetic Powder Dynamometers User's Manual, 2009.