入口流量对变燃速发射药交界面位置影响数值计算

摘要

In the discontinuous co-extension process, the relationship between entry flow rate with the interface layer position of variable burning rate propellant was explored. Bird-Carreau equation was used to describe the rheology of single base propellant feature. The finite element method was used to simulate two kinds of melt in the extrusion of 3-D isothermal flow. Result showed that radius of inner and outer layer interface has a linear relation with the change of inner and outer layer flow ratio, especially in 501 flow rate of inner layer than out layer, the simulation results and the actual extrusion size grain section, the maximum relative error was 8. 3%. In the engineering allowable error range, it would be helpful to guide the intermittent double variable the actual production rate propellant combustion.%在间断式变燃速发射药成型工艺生产条件下，探索内外层入口流量变化及关系对发射药内外层交界面尺寸的影响，采用Bird-Carreau方程描述单基发射药的流变学特征，利用有限元方法模拟两种熔体在共挤出流道内的三维等温流动。研究表明：内外层交界面随着内芯皮料流量比值的变化呈线性关系，在501时所得模拟结果与实际挤出药粒截面尺寸的最大相对误差为8.3%，在工程允许误差范围内，可以指导间断式双层变燃速发射药的实际生产。