This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Characterization of Small-Scale Turbochargers for Unmanned Aerial Systems
ISSN: 0148-7191, e-ISSN: 2688-3627
Published November 08, 2016 by SAE International in United States
Annotation ability available
Aircraft engine power is degraded with increasing altitude according to the resultant reduction in air pressure, temperature, and density. One way to mitigate this problem is through turbo-normalization of the air being supplied to the engine. Supercharger and turbocharger components suffer from a well-recognized loss in efficiency as they are scaled down in order to match the reduced mass flow demands of small-scale Internal Combustion Engines. This is due in large part to problems related to machining tolerance limitations, such as the increase in relative operating clearances, and increased blade thickness relative to the flow area. As Internal Combustion Engines decrease in size, they also suffer from efficiency losses owing primarily to thermal loss. This amplifies the importance of maximizing the efficiency of all sub-systems in order to minimize specific fuel consumption and enhance overall aircraft performance. The lack of published performance data for many commercially sold superchargers in the mass flow range of concern for this study makes selection of efficient turbo-normalization systems very difficult. This paper will present an experimental procedure for characterizing turbomachinery components for several small-scale turbochargers and superchargers of interest for the target engine, which is a small-displacement Diesel engine. Data were derived from testing these machines on an experimental stand of the authors’ design. Compressor and turbine maps created from the resulting data are presented, along with the calculated adiabatic compressor efficiencies.
CitationMataczynski, M., Litke, P., Naguy, B., and Baranski, J., "Characterization of Small-Scale Turbochargers for Unmanned Aerial Systems," SAE Technical Paper 2016-32-0078, 2016, https://doi.org/10.4271/2016-32-0078.
- SAE International Surface Vehicle Recommended Practice Turbocharger Gas Stand Test Code SAE Standard J1826 Mar. 1995
- van Basshuysen , R. and Schaefer , F. Internal Combustion Engine Handbook Society of Automotive Engineers, Inc. Warrendale, PA 978-0-7680-1139-5 2004
- Baines , N. C. Fundamentals of Turbocharging Concepts NREC White River Junction, Vermont 2005
- Compressor Maps Turbo by Garrett® Website http://turbobygarrett.com/turbobygarrett/compressor_maps
- Leufven , O. and Eriksson , L. Engine Test Bench Turbo Mapping SAE Technical Paper 2010-01-1232 2010 10.4271/2010-01-1232
- Mattingly , J. D. Elements of Propulsion: Gas Turbines and Rockets Reston, VA American Institute of Aeronautics and Astronautics 2006
- Park , I. and Williams , A. Inlet Condition Dependency of Centrifugal Compressor Mapped Efficiency SAE Technical Paper 2014-01-2854 2014 10.4271/2014-01-2854
- Boyce , M. Principles of Operation and Performance Estimation of Centrifugal Compressors Proceedings of the 22nd Turbomachinery Symposium Dallas, Texas 13-15 September 1993