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Part 1: Document Description
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Citation |
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Title: |
Characteristics of the Specific Fuel Consumption for Jet Engines |
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Identification Number: |
doi:10.7910/DVN/LZNNL1 |
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Distributor: |
Harvard Dataverse |
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Date of Distribution: |
2019-01-18 |
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Version: |
2 |
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Bibliographic Citation: |
Bensel, Artur, 2019, "Characteristics of the Specific Fuel Consumption for Jet Engines", https://doi.org/10.7910/DVN/LZNNL1, Harvard Dataverse, V2, UNF:6:iYSgvDw0TVg3BlYNfwQH9w== [fileUNF] |
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Citation |
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Title: |
Characteristics of the Specific Fuel Consumption for Jet Engines |
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Alternative Title: |
Links to all related documents: |
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Identification Number: |
doi:10.7910/DVN/LZNNL1 |
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Authoring Entity: |
Bensel, Artur (Hamburg University of Applied Science) |
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Other identifications and acknowledgements: |
Scholz, Dieter |
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Date of Production: |
2018-08-31 |
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Software used in Production: |
Excel |
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Distributor: |
Harvard Dataverse |
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Access Authority: |
Scholz, Dieter |
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Depositor: |
Scholz, Dieter |
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Date of Deposit: |
2019-01-18 |
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Series Name: |
Digital Library - Projects and Theses - Prof. Dr. Scholz |
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Holdings Information: |
https://doi.org/10.7910/DVN/LZNNL1 |
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Study Scope |
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Keywords: |
Engineering, Luftfahrt, Luftfahrzeug, Flugmechanik, Flugtriebwerk, Aeronautics, Airplanes, Airplanes--Performance, Airplanes--Turbojet engines, engine, turbofan, fuel consumption, SFC, TSFC, PSFC, Turbomatch, bucket curve, off-takes, cruise, altitude, speed, Mach, thrust, BPR, data extraction, optimization, range, Breguet |
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Topic Classification: |
Aerospace |
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Abstract: |
Purpose of this project is a) the evaluation of the Thrust Specific Fuel Consumption (TSFC) of jet engines in cruise as a function of flight altitude, speed and thrust and b) the determination of the optimum cruise speed for maximum range of jet airplanes based on TSFC characteristics from a). Related to a) a literature review shows different models for the influence of altitude and speed on TSFC. A simple model describing the influence of thrust on TSFC seems not to exist in the literature. Here, openly available data was collected and evaluated. TSFC versus thrust is described by the so-called bucket curve with lowest TSFC at the bucket point at a certain thrust setting. A new simple equation was devised approximating the influence of thrust on TSFC. It was found that the influence of thrust as well as of altitude on TSFC is small and can be neglected in cruise conditions in many cases. However, TSFC is roughly a linear function of speed. This follows already from first principles. Related to b) it was found that the academically taught optimum flight speed (1.316 times minimum drag speed) for maximum range of jet airplanes is inaccurate, because the derivation is based on the unrealistic assumption of TSFC being constant with speed. Taking account of the (nonlinear) influence of speed on TSFC, the optimum flight speed is only about 1.05 to 1.11 the minimum drag speed depending on aircraft weight. The amount of actual engine data was extremely limited in this project and the results will, therefore, only be as accurate as the input data. Results may only have a limited universal validity, because only four jet engine types were analyzed. One of the project's original value is the new simple polynomial function to estimate variations in TSFC from variations in thrust while maintaining constant speed and altitude. |
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Kind of Data: |
Program and Data |
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Methodology and Processing |
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Sources Statement |
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Data Access |
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Notes: |
This is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, License Version 3. The software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details: http://www.gnu.org/licenses/gpl.html |
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Other Study Description Materials |
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Related Publications |
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Citation |
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Title: |
Bensel, Artur, 2018. Characteristics of the Specific Fuel Consumption for Jet Engines. Project. Hamburg University of Applied Sciences, Aircraft Design and Systems Group (AERO). Available from: |
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Bibliographic Citation: |
Bensel, Artur, 2018. Characteristics of the Specific Fuel Consumption for Jet Engines. Project. Hamburg University of Applied Sciences, Aircraft Design and Systems Group (AERO). Available from: |
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File Description--f3346370 |
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File: TSFC_over_T.tab |
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Notes: |
UNF:6:iYSgvDw0TVg3BlYNfwQH9w== |
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List of Variables: | |
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Variables |
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f3346370 Location: |
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f3346370 Location: |
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f3346370 Location: |
Variable Format: character Notes: UNF:6:TTT4VL1q+qT7Iiti+Tl/gQ== |
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Label: |
SFC_Herrmann_OptimumSpeed.xlsx |
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Text: | |
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Notes: |
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet |
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Label: |
ThrustVariation_Drag_SFC_Vmd.xlsx |
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Text: | |
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Notes: |
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet |