Abstract: A rigid body model and a database including 220 kinds of aerodynamic conditions are established to study the separation and dispersion of cylindrical plates of surface-type IR decoy launched at high-speed. The dispersion process of thousands of plates in surface-type IR decoy launched at 0.8 Mach is numerically simulated based on the flow field numerical simulation of plates’ multi-body separation process. Research results show that the rigid body motion model can be to use to simulate the dispersion process of cylindrical plates. The new distributing characteristics of plate cluster are presented. The surface-type infrared decoy filled with cylindrical plates is validated to quickly spread within 0.5s with a large dispersion area, and the hang time lasts more than 3.0 s with a uniform distribution.

Key words: ordnance science and technology, surface-type infrared decoy, dispersion of plate clusters, modeling and simulation