The combustion flow analysis of kinematic infrared decoy based on MT pyrotechnics
In order to obtain the concentration field and temperature field of the combustion products of the kinematic infrared decoy,a two-dimensional axisymmetric model coupling the flow field and the chemical reaction was established on the basis of analyzing the combustion zone structure and main reaction of the MT system in air.The influence of different components,ambient pressure and inlet air velocity on the combustion flow was analyzed by numerical simulation to further study its radiation characteristics and design a kinematic infrared decoy,which meets the requirements.It was concluded that the effect of MgF2 on the spectrum of the MT system was significant,and the increase of magnesium powder content helped to increase the radiation intensity.However,with the further increase of magnesium,more magnesium did not participate in the reaction,which is not conducive to improving the radiation intensity.Ambient pressure has little effect on the maximum temperature,but affects the temperature and product concentration of the production.The inflow velocity has little effect on the core reaction temperature and product concentration,but it will limit the high-temperature zone and products to a smaller area,thereby affecting the radiation intensity.The above results can provide reference for the design of infrared radiation characteristics of kinematic infrared decoys.
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