Numerical investigation of aerodynamic characteristics of two different component bodies at various angles of attack

The paper presents mathematical modeling results for a supersonic flow around two types of component elements in a composite system designed for fire extinguishing shells. Such shells represent a complex composite system which consists of the elements with a fire extinguishing powder mixture contained inside. Directional separation and controlled dispersion of the parts of the purpose-designed shell allow one to extinguish a fire bed over a long distance and to reduce the time of fire suppression. Complete and reliable information about supersonic separated flow effects on the aerodynamic characteristics of the component elements makes it possible to simulate a separation mechanism and to assess dispersion of the arranged bodies. The paper presents the calculated values of the aerodynamic coefficients for the models of two geometry types depending on the angle of attack and a comparison with experimental data. Discrepancy between the theoretical results obtained and experimental data on the main aerodynamic characteristics does not exceed 5%. For the bodies under consideration, the difference in drag coefficients is up to 10%; as for lift and pitch moment coefficients, the difference is less than 5 % for the angle of attack in the range of 0° and 10°, and reaches 30% when the angle is more than 15°.

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