Estimation of energetic efficiency of heat supply in front of the aircraft at supersonic accelerated flight. Part 1. Mathematical models |
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Authors: | A F Latypov |
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Institution: | (1) Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia |
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Abstract: | Fuel economy at boost trajectory of the aerospace plane was estimated during energy supply to the free stream. Initial and
final flight velocities were specified. The model of a gliding flight above cold air in an infinite isobaric thermal wake
was used. The fuel consumption rates were compared at optimal trajectory. The calculations were carried out using a combined
power plant consisting of ramjet and liquid-propellant engine. An exergy model was built in the first part of the paper to
estimate the ramjet thrust and specific impulse. A quadratic dependence on aerodynamic lift was used to estimate the aerodynamic
drag of aircraft. The energy for flow heating was obtained at the expense of an equivalent reduction of the exergy of combustion
products. The dependencies were obtained for increasing the range coefficient of cruise flight for different Mach numbers.
The second part of the paper presents a mathematical model for the boost interval of the aircraft flight trajectory and the
computational results for the reduction of fuel consumption at the boost trajectory for a given value of the energy supplied
in front of the aircraft. |
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Keywords: | freestream heating gliding flight efficiency scramjet exergy method optimal trajectory |
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