Abstract
The work is devoted to the study of the influence of an air environment with different chemical composition on the aerodynamics of small aircrafts of the airplane type used for reconnaissance purposes in case of fires. The thermodynamic properties of the combustion products formed during the combustion of rubber and foam rubber were calculated. The properties of the medium were taken into account in the mathematical modeling of the flight aerodynamics of an unmanned aerial vehicle. The mathematical model is based on solving conservation equations in a non-isothermal formulation for a turbulent viscous compressible flow using the k-ε turbulence model. The pressure and velocity fields of the environment were obtained during the flow around the wing, and the values of drag and lift forces were compared in the presence of combustion products in the air and without them. In particular, the numerical calculations were carried out in the presence of a vertical temperature gradient in the design area simulating the heating of air masses during fires with the study of the influence of these gradients on the aerodynamic characteristics of the wing. The calculations show that with an increase in the vertical temperature gradient by 60 K/m, the values of lift and drag decrease by 5 %.
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