Research On Reaction Characteristics Of Typical Composite Propellant And Its Simulated Charge Under Laser Irradiation

In order to explore the response characteristics of solid rocket motor to laser stimulation,the PBT composite solid propellant,the simulated shell of engine and the simulated charge were irradiated for 40s by laser with different energy density,the reaction delay time,reaction temperature and reaction process were studied.The results of the study of PBT composite solid propellant under the laser irradiation show that:in the four solid propellant samples,the reaction delay time tsample 1<tsample2<tsample 3<tsample 4;In solid state of PBT composite solid propellant,the reaction delay Time of Al-containing component is the shortest,the maximum reaction delay time is 6 ms,the shortest is 0.4 ms,the next is AP+HMX,the smallest reaction delay time is 0.113 s,the largest reaction delay time is 0.408 s,the next is HMX,its smallest reaction delay time is 1.05s,the largest reaction delay time is 3.45 s,there was no reaction between AP and AL;There’s no reaction between A3 and Bunena in the binder system,the reaction delay time of PBT was1.42 s and 2.04 s,and the reaction delay time decreased with the increase of laser energy.The reaction temperature of propellant samples 1,2 and 4 fluctuated from 600°C to 800°C,and that of propellant samples 3 fluctuated from 800°C to 1000°C.In solid components,the reaction temperature TAL powder>TAL powder and HMX>TAL powder and AP>THMX、AP and AL _powder>T_HMX>T_{AP and HMX},in the binder system,the reaction temperature of A3 and BuNENA fluctuated from 200°C to 300°C,and the reaction temperature of PBT fluctuated from400°C to 1000°C.The results of stress response of simulated Shell show that:Under the same other conditions,the corresponding tensile parameters of shell under atmospheric pressure and pressurized（3MPa）shell,like the test force,the deformation amount,and the breaking time are relatively close.The maximum temperature of the shell under atmospheric pressure is about1030,780,420℃on the condition of 223w·cm^-2laser energy,the maximum temperature is about 1020,780,620℃.On the condition of 323w·cm^-2laser energy,and the maximum temperature of the pressurized shell is 1080,690,420℃on the condition of 223w·cm^-2laser,the maximum temperature under 323w·cm^-2laser conditions is about 900,750,600℃.The tensile parameter value of the same shell in the initial stage of tensile force is slightly larger than that of the tensile yield stage when the laser is applied.As the thickness of the shell increases,the influence of laser energy becomes more obvious.Compared with the blank shell,the test force,the deformation amount,and the breaking time are all reduced.Test force change rate during the laser action is obviously reduced,and it will recover after the end.The response characteristics of the simulated charge to the laser stimulation show that:sample 1 without thermal insulation layer,the reaction delay time is 1.0s under 140w·cm-2laser irradiation,the reaction delay time is 24.9s when the 1mm thermal insulation layer is added,and the reaction delay time is 39.1s when the 2mm thermal insulation layer is added.The reaction delay time of different samples is similar under the conditions of the same thickness of the shell and the same energy density.The low power energy density laser is greatly affected by the thickness of the heat insulation layer and the thickness of the shell.The thermal insulation layer can make the propellant react after a period of time without laser irradiation.The peak temperature of the non-insulation layer is between 800 and 1400℃.After adding the 1mm thermal insulation layer,the peak average temperature is concentrated between 1000 and 1200℃.After adding the 2mm thermal insulation layer,the peak average temperature is concentrated between 1000 and 1400℃.