变燃速发射药挤出过程中药料流动计算研究

Computational Study of Flow for Outside Layer of Variable-burning Rate Propellant During Extrusion

为了研究连续式制备变燃速发射药过程中挤出条件对药型尺寸一致性的影响，利用polyflow软件，对不同操作条件下药料流动情况进行了三维数值模拟。通过对计算结果的处理，讨论影响其体积流率波动的因素，以期给实际制备中操作参数的设置提供参考。研究结果表明：药料体积流率与螺杆转速成正比；不同转速下药料体积流率高频波动值在0．017％～0．036％之间；药料体积流率波动值与螺杆转速波动值成正比。药料体积流率与入口压力成正比；不同人口压力下体积流率高频波动值在0．024％-0．025％之间；药料体积流率波动值随着人口压力的增大而增大。螺杆转速（入口压力）越大，药料体积流率随螺杆转速波动（入口压力波动）增大其增大幅度越大。螺杆转速波动与入口压力波动相比，螺杆转速波动对变燃速发射药药料体积流率波动影响较大。

In order to study the factors affecting the conformity of the type and size of the variable-burning rate propellant and provide a reference to the actual operation for setting the appropriate parameter, three-dimensional flows of variable-burning rate propellant solution in the screw were simulated using the polyflow software under different operating conditions. Simulation results show that the volume flow rate of outside layer is directly proportional to the screw velocity. When the screw velocity is different, the high frequency fluctuation values of the volume flow rate are 0. 017% -0. 036%. The fluctuation values of the volume flow rate are directly proportional to the fluctuation values of the screw velocity. The volume flow rate of the outside layer is directly proportional to the entrance pressure. When the entrance pressure is different, the high frequency fluctuation values of the volume flow rate are 0. 024% -0. 025%. When the screw velocity is higher, the fluctuation values of the volume flow rate rapidly increase with the increasing of the fluctuation values of the screw velocity. When the entrance pressure is higher,the fluctuation values of the volume flow rate rapidly increase with the increasing of the fluctuation value of entrance pressure. The fluctuation values of the screw velocity affect the volume flow rate of variable-burning rate propellant more largely than the fluctuation values of the entrance pressure.