TY - GEN
T1 - Uncertainty of thrust prediction for a small demonstration turbojet
AU - Perez-Blanco, H.
AU - Kunkel, D.
PY - 2010
Y1 - 2010
N2 - A small turbojet, the SR-30, is often used in academic settings to demonstrate thrust generation. The experience and insights afforded by this type of experimentation we find invaluable, because the students appraise a turbojet, from start-up to wind down, in all its dimensions: from basic thermodynamics to creep considerations, passing through instrumentation and lubrication. Experimental uncertainties of measurements taken on this unit lead to conflict with basic thermofluids laws, and have been reported in the literature. The present work introduces a thermodynamic model whereby the thrust can be calculated for a range of speeds. The model resorts to conservation principles and efficiencies to factor in the turbine irreversibilities. Six significant variables are assigned uncertainties, and a thrust distribution is generated via a Monte-Carlo analysis. The parameters of the thrust distribution are analyzed to determine the reliability of thrust predictions. Intermediate cycle temperatures can be estimated via an approach consistent with the thermo-fluids laws.
AB - A small turbojet, the SR-30, is often used in academic settings to demonstrate thrust generation. The experience and insights afforded by this type of experimentation we find invaluable, because the students appraise a turbojet, from start-up to wind down, in all its dimensions: from basic thermodynamics to creep considerations, passing through instrumentation and lubrication. Experimental uncertainties of measurements taken on this unit lead to conflict with basic thermofluids laws, and have been reported in the literature. The present work introduces a thermodynamic model whereby the thrust can be calculated for a range of speeds. The model resorts to conservation principles and efficiencies to factor in the turbine irreversibilities. Six significant variables are assigned uncertainties, and a thrust distribution is generated via a Monte-Carlo analysis. The parameters of the thrust distribution are analyzed to determine the reliability of thrust predictions. Intermediate cycle temperatures can be estimated via an approach consistent with the thermo-fluids laws.
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U2 - 10.1115/IMECE2010-40050
DO - 10.1115/IMECE2010-40050
M3 - Conference contribution
AN - SCOPUS:84881403562
SN - 9780791844434
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
SP - 209
EP - 215
BT - ASME 2010 International Mechanical Engineering Congress and Exposition, IMECE 2010
T2 - ASME 2010 International Mechanical Engineering Congress and Exposition, IMECE 2010
Y2 - 12 November 2010 through 18 November 2010
ER -