Research On Modeling And Simulation Method Of Infrared Decoy Dynamic Radiation Characteristics Based On Combustion DPM Theory

Infrared(IR)decoy missile is an important decoy weapon that directly influences operational effectiveness of infrared guided weapons.To ensure the hit rate of an attacking weapon,it is necessary to build an accurate infrared decoy simulation modeling.Current infrared decoy models,which are based on finite element theories,are physically over-simplified.Thus,it leads to obvious errors of simulation results.Aiming this disadvantage,the paper brings out a fused modeling method of the discrete phase modeling(DPM)theory and the Mg/PTFE/Viton(MTV)burning reaction dynamics modeling.Establishing a IR decoy simulation model based on the DPM theory improves the model accuracy.Upon this,build an infrared semi-entity simulation system,and lay the foundation of infrared guided algorithm performance verification.Detailed work includes:Because decoy tail flame radiation is generated from MTV burning components thermal radiation,the base of building an accurate radiation characteristics model of tail flame is to calculate burning components space distributions and temperature fields at every moment.Firstly,study the mechanism of MTV burning in the air.Build chemical reaction dynamics model of burning MTV.Based on this,establish the flow field burning model of a single MTV particle,calculate its burning process,and analye the influences of different environmental factors,particle diameters and doping ratio regarding to MTV burning.A decoy is composed by the burning outcomes of MTV particles largely distributed in the space and the air.Particles with the same volume have higher initial kinetic energy and longer lasting exothermic capacity than the air.Therefore,the decoy tail flame space distribution model regarding particles as study object.Then,build the decoy tail flame space distribution model based on DPM.Analyze the MTV particles stress conditions in Lagrange coordinate system,build flow field turbulence model,particles movement control equations and energy transportation equations,separately calculate tail flame space distribution and temperature field.Bring out the IR radiation model based on equivalent molecular blackbody(EBM),and calculate the distribution characteristics of decoy tail flame from different angles.As the traditional DPM modeling theory is used to calculate decoy tail flame radiation characteristics.Next,in order to solve the issue,ring out IR decoy tail flame radiation characteristics model based on burning phase DPM.Fuse the traditional DPM theory and the MTV burning chemical reaction dynamics model,calculate decoy tail flame components space distributions and temperature fields at every moment,and then calculate decoy tail flame radiation characteristics.Extend the "multi-group EBM" radiation model,and calculate the decoy tail flame radiation characteristics and multi bands simulation graphics from different angles.In actual applications,testing IR guided algorithm requires to generate actual infrared simulation images in the semi-entity simulation system.Thus,design IR image generation algorithm under real combat backgrounds,and build the IR semientity simulation system,By designing 6 Degree-of-Freedom dynamic mesh,and calculate decoy tail flame distribution characteristics and radiation characteristics in high speed flying state.Generate the decoy simulation image under the combat background.Based on that,build the IR semi-entity simulation platform,and lay the foundation of IR guided algorithm verification.