This paper describes the application of a weight and cost-estimating methodology used in an undergraduate aircraft engine design course that is taught in concert with a companion course in airframe design. The two preliminary designs, one for the engine and the other for the airframe, must be integrated as subsystems within a system to satisfy the performance requirements of a given mission as outlined in a single “request for proposals”. In recent years, systems engineering management majors have been added to the design teams to work alongside the aeronautical engineering majors to analyze and report on costs, schedule, and technical risk factors in addition to the operational performance factors that have previously been the sole focus of the course. The teaming of technical management majors and aeronautical engineering majors has been driven by a heightened emphasis on system affordability. The cost-estimating methodology for gas turbine engines uses cycle parameters such as turbine rotor inlet temperature, overall pressure ratio, specific fuel consumption, level of technology, and engine dry weight as inputs. A methodology for estimating dry engine weight was developed which uses engine cycle parameters and fan face diameter as inputs in a volume analog scaling factor which was correlated against historical engine weight data. To tie all of the performance, weight, cost, and development time issues together, the paper presents an “analysis of alternatives” example that considers three different engine cycle alternatives. The design tools presented in this paper will provide a strong foundational understanding of how to systematically weigh and evaluate the important tradeoffs between aircraft turbofan engine performance, cost, schedule, and risk factors. Equipping students with the insight and ability to perform these multidisciplinary trade studies during the preliminary engine design process is this paper’s most important contribution.
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ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
June 3–7, 2013
San Antonio, Texas, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5518-8
PROCEEDINGS PAPER
Estimating Gas Turbine Engine Weight, Costs, and Development Time During the Preliminary Aircraft Engine Design Process Available to Purchase
Aaron R. Byerley,
Aaron R. Byerley
USAF Academy, USAFA, CO
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August J. Rolling,
August J. Rolling
USAF Academy, USAFA, CO
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Kenneth W. Van Treuren
Kenneth W. Van Treuren
USAF Academy, USAFA, CO
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Aaron R. Byerley
USAF Academy, USAFA, CO
August J. Rolling
USAF Academy, USAFA, CO
Kenneth W. Van Treuren
USAF Academy, USAFA, CO
Paper No:
GT2013-95778, V004T08A011; 8 pages
Published Online:
November 14, 2013
Citation
Byerley, AR, Rolling, AJ, & Van Treuren, KW. "Estimating Gas Turbine Engine Weight, Costs, and Development Time During the Preliminary Aircraft Engine Design Process." Proceedings of the ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. Volume 4: Ceramics; Concentrating Solar Power Plants; Controls, Diagnostics and Instrumentation; Education; Electric Power; Fans and Blowers. San Antonio, Texas, USA. June 3–7, 2013. V004T08A011. ASME. https://doi.org/10.1115/GT2013-95778
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