Numerical simulation of unsteady characteristics of large flow rate jet interference

Abstract In this paper, for a cone-column-skirt spiral shape, the unsteady characteristics of complex flow caused by strong interference of large flow jets and high-speed incoming flow are studied. The unsteady numerical simulation method based on partition docking structure grid and double time step iteration is used to implement the integrated unsteady calculation of external flow around the aircraft/nozzle flow. The unsteady characteristics of large flow jet interference under the influence of jet startup and shutdown, different jet pressure building forms, and incoming flow conditions (flight altitude, flight Mach number, and angle of attack) are studied. The characteristics of the jet interference flow field structure, jet thrust coefficient, and aerodynamic interference coefficients of the projectile body over time under various conditions are discussed. The research results can provide necessary references for relevant aircraft design.