Simulation Research on Closed Infrared Radiation Characteristics Based on MT Pyrotechnics
A closed infrared radiation characteristic generation technology based on magnesium/polyterafluoro-ethylene(MT)pyrotechnic compound is proposed.The combustion properties,the thermal property characteristics of the combustion products and infrared radiation generation principle of the MT pyrotechnic are analyzed.In order to obtain the temperature field distribution characteristics of the surface of the infrared radiation structure,the com-bustion properties of the combustion products of the MT pyrotechnic compound system in a fully closed adiabatic system are analyzed through theoretical calculations.A two-dimensional axisymmetric model is established for the coupling of flow field,chemical reaction and thermal radiation.The influence of magnesium/polyterafluoroethylene agent ratio and grain diameter on the surface temperature distribution of infrared radiation structure is analyzed through numerical simulation.Simulation calculation results show that in the B pyrotechnic compound system,ap-propriately reducing the magnesium power content is beneficial for increasing combustion heat and improving the surface temperature of the radiation structure.In the combustion process of MT pyrotechnic compound,the higher is the temperature of the combustion products,the worse is the uniformity of the surface temperature distribution of the infrared radiation structure.By increasing the diameter of the pyrotechnic compound column and expanding the heat flow area,it is beneficial to shorten the infrared radiation intensity forming time and improve temperature distri-bution.
infrared radiation structureMg/PTFEcombustion flow fieldtemperature distribution
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