In order to study the influence of stretching process parameters on the safety performance of modified double base propellant molding process,the compression melting section,melt conveying section and die forming section are modeled as a whole,the density,rheological properties of the modified double base propellant slurry are determined,the mesh independ-ence of the fluid domain is verified based on Polyflow software,and the safety characteristics of the stretch molding process of the modified double base propellant slurry under non-isothermal conditions are studied.The results show that the increase of screw speed increases the temperature,pressure and shear rate of the slurry,and there is a risk of ignition and explosion,in or-der to ensure the safety,the appropriate screw speed in the stretching molding process is 10r/min.With the increase of screw temperature,the shear rate decreases,the plasticization degree of the material becomes worse,and the increase of screw temperature is easy to decompose the material,combined with the composition characteristics of the sensitive material of mod-ified double base propellant,the screw temperature is relatively safe at 85℃.Compared with the screw temperature,the change of sleeve temperature has little influence on the material flow field,and combined with the actual production conditions of modified double base propellant,the sleeve holding temperature of 70 ℃ is suitable for the production of modified double base propellant.Based on the simulation results,it is concluded that the effects of rapid changes in pressure and temperature should be paid attention to in the propellant production process.
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