Reverse capacity and aircraft thrust reverse application efficiency

DOI: 10.34759/vst-2021-1-7-18

Аuthors

Komov A. A.^1*, Echevskii V. V.^2**

1. Moscow State Technical University of Civil Aviation, 20, Kronshtadskiy Bulvar, Moscow, 125993, Russia
2. 929th State flight-test center of the defence Ministry named after V.P. Chkalov, Akhtubinsk, Astrakhan region, 416500, Russia

*e-mail: komesk73@yandex.ru
**e-mail: echevskii_vladim@mail.ru

Abstract

The article considers the issues associated with clarification of terms concerning thrust reverse, and requiring refinement in view of formulations and comprehension inaccuracy:

• factor of reversing;
• aircraft reverse capacity;
• optimal value of the engine reverse thrust; < li>reversing device efficiency.

The existing values of the factor of reversing R = = 0,4...0,5 do not indicate the degree of the reversing device (RD) structural perfection, as is commonly believed, but rather their gas-dynamic imperfection, since, significant losses of the total pressure of about 50% arise while the gas flow U-turn in the reversing devices.

The aircraft reverse capacity (Qrev = R/Glw), where R is the reverse thrust value and Glw is the aircraft landing weight, also cannot represent the factor, defining the thrust reversing effectiveness, since excessive reverse capacity leads to the reverse thrust excessiveness and run length increase.

A certain value of optimal reverse thrust, depending on external aerodynamics of the power plant, exists for each airplane type. There should be a possibility of the engine reverse thrust control value over wide range to employ a certain engine for various types of aircraft. Thus, the reverse thrust value depends on the aircraft layout, and it is a belonging to not only the engine, but to the aircraft as well.

Reverse thrust application effectiveness on the aircraft is higher at the reverse jets fluxion optimization, than at the reverse thrust optimization. Efficiency improving of application of the thrust reverse means fulfilling the following three indicators:

• reducing the aircraft run length;
• minimizing the reverse thrust value;
• ensuring engines protectiveness from the entry of reverse jets and foreign objects, thrown-into from the runway surface by the reverse jets.

Keywords:

thrust reverse, engine protectiveness, factor of reverse, optimum level of reverse thrust, aircraft reverse capacity, efficiency factor of thrust reverse application

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