Development of a method to improve the calculation accuracy of specific fuel consumption for performance modeling of air-breathing engines

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.229515

Keywords:

fuel-air ratio, specific fuel consumption, combustor, isobaric heat capacity, air-breathing engine

Abstract

Determination of specific fuel consumption of air-breathing engines is one of the problems of modeling their performance. As a rule, the estimation error of the specific fuel consumption while calculating air-breathing engine performance is greater than that of thrust. In this work, this is substantiated by the estimation error of the fuel-air ratio, which weakly affects thrust but significantly affects the specific fuel consumption. The presence of a significant error in the fuel-air ratio is explained by the use of simplified methods, which use the dependence of enthalpy as a function of mixture temperature and composition without taking into account the effect of pressure. The developed method to improve the calculation accuracy of specific fuel consumption of air-breathing engines is based on the correction of the fuel-air ratio in the combustor, determined by the existing mathematical models. The correction of the fuel-air ratio is made using the dependences of enthalpy on mixture temperature, pressure and composition. The enthalpy of the mixture is calculated through the average isobaric heat capacity obtained by integrating the isobaric heat capacity, depending on mixture temperature, pressure and composition. The calculation accuracy of the fuel-air ratio was verified by comparing it with the known experimental data on the combustion chamber of the General Electric CF6-80A engine (USA). The average calculation error of the fuel-air ratio does not exceed 3 %. The developed method was applied for correcting the specific fuel consumption for calculating the altitude-airspeed performance of the D436-148B turbofan engine (Ukraine), which made it possible to reduce the estimation error of the fuel-air ratio and specific fuel consumption to an average of 3 %

Author Biographies

Oleh Kislov, National Aerospace University "Kharkiv Aviation Institute"

PhD, Associate Professor

Department of Aviation Engines Theory

Maya Ambrozhevich, National Aerospace University "Kharkiv Aviation Institute"

PhD, Associate Professor

Department of Aerospace Heat Engineering

Mykhailo Shevchenko, National Aerospace University "Kharkiv Aviation Institute"

Postgraduate Student

Department of Aviation Engines Theory

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Published

2021-04-30

How to Cite

Kislov, O., Ambrozhevich, M., & Shevchenko, M. (2021). Development of a method to improve the calculation accuracy of specific fuel consumption for performance modeling of air-breathing engines . Eastern-European Journal of Enterprise Technologies, 2(8 (110), 23–30. https://doi.org/10.15587/1729-4061.2021.229515

Issue

Vol. 2 No. 8 (110) (2021): Energy-saving technologies and equipment

Section

Energy-saving technologies and equipment

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Copyright (c) 2021 Олег Владимирович Кислов, Мая Владимировна Амброжевич, Михаил Анатольевич Шевченко

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