Numerical Simulation Of Single-screw Extrusion Propellant Process Based On POLYFLOW

The single screw extrusion process of solid propellant is an important process condition for the current propellant production.Most of the researches on single screw numerical simulation are focused on the production of high molecular polymers,and the research on the propellant extrusion process is still less.Propellant is an energetic material,which is prone to self-degradation and dangerous accidents such as explosion during the production process.the traditional experimental research is prone to danger and consumes human and material resources and time cost,so the numerical simulation method is used to study the screw extrusion process.The first step is the drawing of the geometric model and the calculation of numerical simulation.And then drawing the mesh of the screw and the flow channel by the meshing software Gambit.Finally,importing the drawn mesh file into the software POLYFLOW in ANSYS Boundary setting and simulation calculation were performed with the screw,and the obtained results were analyzed by CFD-POST software.The second step is the analysis of the results post-processing.The post-processing focuses on the change of the propellant fluid flow parameters during the extrusion process at different speeds.In the analysis process,the simulation was divided into two cases: steady state and nonsteady state.The analysis of parameters(temperature,speed,shear rate,pressure,etc.)was based on constant speed(10rpm)and different speeds(10,12,14,16,18,20 rpm).The above analysis and results show that: during the extrusion process,parameters such as the temperature and pressure of the fluid and the shear rate have a positive correlation with the rotation speed of the screw;the peaks of each parameter are obtained at the screw face;the temperature is at the exit of the fluid region There is a maximum value in the outlet,and the temperature is prone to abrupt changes in this area.Therefore,we must ensure that the temperature and screw speed are within the range of safe production.Because the simulation in this paper is based on the actual parameters of the propellant production process,the simulation is divided into two cases of steady state and transient state,which can well simulate the production in the single screw extrusion process.Therefore,the simulation results can provide some guiding significance for actual production.