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TsAGI Science Journal

ISSN Imprimer: 1948-2590
ISSN En ligne: 1948-2604

TsAGI Science Journal

DOI: 10.1615/TsAGISciJ.2015013290
pages 639-657

FUEL CONSUMPTION MINIMIZATION FOR AGRICULTURAL AIRCRAFT CONDUCTING SPRAYING

Stanislav Nikolaevich Suprunenko
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky Str., Zhukovsky 140180, Russia
Lam Thanh Tang
Moscow Institute of Physics and Technology (MIPT), 9 Institutskiy per., Dolgoprudny, Moscow Region, 141700 Russia

RÉSUMÉ

A problem of fuel consumption minimization for agricultural aircraft conducting spraying of chemicals in a horizontal flight is considered. The problem is formulated as an optimal control one to be solved by variational methods, with particular regard to the nonstationarity of aircraft full mass during flight and to the complexity of an engine's fuel consumption characteristics. A technique, proposed to determine the optimal solution, is based on an idea of making small improvements to the well-known quasi-stationary solution corresponding to an assumption of equality between the engine thrust and the aerodynamic drag. Illustrations of numerical computations fulfilled for the agricultural airplane PZL M-15 (Soviet-Poland design) show that in the case of sufficiently intensive spray-mass expenditure the proposed optimal solution can noticeably raise the fuel saving.


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