Abstract
Ground track tests of modern ballistic-type aircraft products make it possible to simulate aerodynamic loads in conditions with a maximum medium density and having a significantly lower cost compared to flight tests. During track testing of products at supersonic speeds, intense vibrations of the structural elements of the movable track equipment and the product under test occur. The article deals with the processes of air flow around a rail installation moving with a high acceleration. Basic models are applied that describe the motion of a homogeneous medium at various velocities, accounting the effects of compressibility, turbulence, and heat transfer. Depending on the conditions, various flow turbulence models are used. An algorithm for numerical implementation on a rectangular grid with local adaptation and subgrid resolution of complex geometry is developed. The methodology for the numerical solution of the equations of dynamics describing the flow of a compressible gas around a curved surface is based on the integration of fluid motion and the transfer of scalar quantities in partial derivatives with respect to the volumes of computational cells-polyhedrons. Using the FlowVision software package, the simulation of the supersonic air flow around products of various shapes was performed in relation to track tests. This made it possible to determine previously unknown dependences of the coefficients of aerodynamic drag, lift force and lateral force on the speed of motion, as well as the moments of aerodynamic forces for estimating the contribution of airflow processes to the total vibration field acting on the track carriage with the product.
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