Transport category airplane flight range calculation accounting center-of-gravity position shift and engine throttling characteristics

A problem facing world commercial aviation is a provision of the flight range and an increase in the fuel efficiency of transport category airplanes using fuel trim transfer application, which allows for decreasing airplane trim drag at cruise flight. In the existing mathematical models, center-of-g...

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Autores principales:	Ruslan Tsukanov, Viktor Riabkov
Formato:	article
Lenguaje:	EN RU UK
Publicado:	National Aerospace University «Kharkiv Aviation Institute» 2021
Materias:	center-of-gravity flight range fuel system aerodynamic performance required thrust specific fuel consumption Motor vehicles. Aeronautics. Astronautics TL1-4050
Acceso en línea:	https://doaj.org/article/56115738ef4346c8b8d19995b77adec1
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id	oai:doaj.org-article:56115738ef4346c8b8d19995b77adec1
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spelling	oai:doaj.org-article:56115738ef4346c8b8d19995b77adec12021-11-09T07:54:20ZTransport category airplane flight range calculation accounting center-of-gravity position shift and engine throttling characteristics1727-73372663-221710.32620/aktt.2021.5.01https://doaj.org/article/56115738ef4346c8b8d19995b77adec12021-10-01T00:00:00Zhttp://nti.khai.edu/ojs/index.php/aktt/article/view/1543https://doaj.org/toc/1727-7337https://doaj.org/toc/2663-2217A problem facing world commercial aviation is a provision of the flight range and an increase in the fuel efficiency of transport category airplanes using fuel trim transfer application, which allows for decreasing airplane trim drag at cruise flight. In the existing mathematical models, center-of-gravity position is usually assumed fixed, but with fuel usage, center-of-gravity shifts within the definite range of center-of-gravity positions. Until the fuel trim transfer was not used in airplanes, the center-of-gravity shift range was rather short, that allowed to use the specified assumption without any considerable mistakes. In case of fuel trim transfer use, center-of-gravity shifts can reach 15…20 % of mean aerodynamic chord, that requires considering the center-of-gravity actual position during the flight range calculation. Early made estimated calculations showed the necessity of following mathematical model improvement using accounting the real engine throttling characteristics. The goal of this publication is to develop a method of flight range calculation taking transport category airplane into account actual center-of-gravity position with fuel using and variation in engine-specific fuel consumption according to their throttling characteristics. On the basis of real data from engine maintenance manuals, formulas are obtained for approximation throttling characteristics of turbofan engines in the form of dimensionless specific fuel consumption (related to the specific fuel consumption at full thrust) dependence on the engine throttling coefficient. A mathematical model (algorithm and its program implementation using С language in Power Unit 11.7 R03 system) has been developed to calculate the airplane flight range accounting its actual center-of-gravity position shift with fuel usage and variation in specific fuel consumption according to engine throttling characteristics. Using comparison with known payload-range diagram, adequacy of developed mathematical model is shown. Recommendations to improve the mathematical model are also given.Ruslan TsukanovViktor RiabkovNational Aerospace University «Kharkiv Aviation Institute»articlecenter-of-gravityflight rangefuel systemaerodynamic performancerequired thrustspecific fuel consumptionMotor vehicles. Aeronautics. AstronauticsTL1-4050ENRUUKАвіаційно-космічна техніка та технологія, Vol 0, Iss 5, Pp 4-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN RU UK
topic	center-of-gravity flight range fuel system aerodynamic performance required thrust specific fuel consumption Motor vehicles. Aeronautics. Astronautics TL1-4050
spellingShingle	center-of-gravity flight range fuel system aerodynamic performance required thrust specific fuel consumption Motor vehicles. Aeronautics. Astronautics TL1-4050 Ruslan Tsukanov Viktor Riabkov Transport category airplane flight range calculation accounting center-of-gravity position shift and engine throttling characteristics
description	A problem facing world commercial aviation is a provision of the flight range and an increase in the fuel efficiency of transport category airplanes using fuel trim transfer application, which allows for decreasing airplane trim drag at cruise flight. In the existing mathematical models, center-of-gravity position is usually assumed fixed, but with fuel usage, center-of-gravity shifts within the definite range of center-of-gravity positions. Until the fuel trim transfer was not used in airplanes, the center-of-gravity shift range was rather short, that allowed to use the specified assumption without any considerable mistakes. In case of fuel trim transfer use, center-of-gravity shifts can reach 15…20 % of mean aerodynamic chord, that requires considering the center-of-gravity actual position during the flight range calculation. Early made estimated calculations showed the necessity of following mathematical model improvement using accounting the real engine throttling characteristics. The goal of this publication is to develop a method of flight range calculation taking transport category airplane into account actual center-of-gravity position with fuel using and variation in engine-specific fuel consumption according to their throttling characteristics. On the basis of real data from engine maintenance manuals, formulas are obtained for approximation throttling characteristics of turbofan engines in the form of dimensionless specific fuel consumption (related to the specific fuel consumption at full thrust) dependence on the engine throttling coefficient. A mathematical model (algorithm and its program implementation using С language in Power Unit 11.7 R03 system) has been developed to calculate the airplane flight range accounting its actual center-of-gravity position shift with fuel usage and variation in specific fuel consumption according to engine throttling characteristics. Using comparison with known payload-range diagram, adequacy of developed mathematical model is shown. Recommendations to improve the mathematical model are also given.
format	article
author	Ruslan Tsukanov Viktor Riabkov
author_facet	Ruslan Tsukanov Viktor Riabkov
author_sort	Ruslan Tsukanov
title	Transport category airplane flight range calculation accounting center-of-gravity position shift and engine throttling characteristics
title_short	Transport category airplane flight range calculation accounting center-of-gravity position shift and engine throttling characteristics
title_full	Transport category airplane flight range calculation accounting center-of-gravity position shift and engine throttling characteristics
title_fullStr	Transport category airplane flight range calculation accounting center-of-gravity position shift and engine throttling characteristics
title_full_unstemmed	Transport category airplane flight range calculation accounting center-of-gravity position shift and engine throttling characteristics
title_sort	transport category airplane flight range calculation accounting center-of-gravity position shift and engine throttling characteristics
publisher	National Aerospace University «Kharkiv Aviation Institute»
publishDate	2021
url	https://doaj.org/article/56115738ef4346c8b8d19995b77adec1
work_keys_str_mv	AT ruslantsukanov transportcategoryairplaneflightrangecalculationaccountingcenterofgravitypositionshiftandenginethrottlingcharacteristics AT viktorriabkov transportcategoryairplaneflightrangecalculationaccountingcenterofgravitypositionshiftandenginethrottlingcharacteristics
_version_	1718441197266010112

Transport category airplane flight range calculation accounting center-of-gravity position shift and engine throttling characteristics

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