改性双基推进剂剪切压延过程的数值模拟

The application of the shear calender in the processing of modified double-base propellant solves the shortcomings of traditional technology, such as intermittent production, low production efficiency, low product yield and poor product quality, which can realize automatic, continuous production, and greatly improve the mixing efficiency and plasticizing performance.In this paper, Computational Fluid Dynamics (CFD) method was introduced into the study on the shear calendering process of modified double-base propellant.Pro/Engineer software was used to establish the three-dimensional geometric model of the process and HyperMesh software was used to perform finite element meshing on geometric model.The simulation calculation was carried out using POLYFLOW software to analyze the distribution of parameters including velocities, pressure, shear rate, viscous heating, temperature and mixing index to provide a reference for the optimization of actual equipment and process.According to the calculation results of numerical simulation analysis, the modified double-base propellant medicinal material is subjected to the big shear squeezing action produced by the rotation of the two rollers in the roll gap area of the shear calender.The pressure, shear rate, viscosity heat and mixing index in this areais significantly higher than other regions.The maximum mixing index can be reached to 0.88. The uniformity of velocity distribution and shear rate distribution is good, which is beneficial to improve the molding quality of the product. After ignoring the import and export effect, the average velocity fluctuate around 0.376 m/s, and the maximum shear rate fluctuated within the range of 25~30 s^-1.The temperature and pressure changes are relatively stable, which can improve the safety of the process.