Thermodynamics study of laser fuze at different initial velocities

Conventional ammunition laser fuze is usually located in the cylinder at the head of projectile (eg. PX581 mortar projectile). In external trajectory flight, an aerodynamic heating effect usually results from air viscosity, so the temperature on the surface of fuze and its optical lenses may increase, and the thermal strain may occur, which influences the overall power of it and the ammunition. As a result, it is vital to figure out the increase in temperature and thermal strain of fuze. Thermodynamics study of mortar projectile laser fuze at various muzzle velocities was carried out, especially about the aerodynamics heating and thermal strain of the lenses which are located in special geometric position. First, the fluid-structure interaction parameters were calculated utilizing CFD method. Preprocess software ICEM CFD and simulation software FLUENT were utilized. Second, ANSYS WorkBench was used to analyze the thermal strain. The result shows that the increase in temperature doesn't exceed the limit of the optical material, so the function of laser fuze and the power of projectile won't be affected. This paper demonstrates the rationality of material choice of laser fuze optical system.