轴向过载下固体推进剂药柱变形研究

Deformation of solid propellant grains under axial acceleration load

关键词:  推进剂药柱  轴向载荷  粘弹性  有限元法  离心试验

Key words:  Propellant grain  Axial load  Viscoelasticity  Finite element method  Centrifugal test

摘要:

采用Φ315试验发动机,对某新型推进剂翼槽型药柱进行了10g,20g,30g和35g的轴向过载离心实验,测量了药柱前端面靠近内孔处测点的位移;并运用三维线性粘弹性有限元模型,对离心实验过程进行了数值模拟,以确定固体推进剂药柱在轴向过载作用下的变形问题。结果表明,计算值与实验结果符合较好,证实了粘弹性有限元模型适用于过载条件下药柱变形的研究。

Abstract:

Using Φ315 test motor, the centrifugal test of 10g, 20g, 30g and 35g axial acceleration for a new propellant grain with fin-slots was completed. The displacements of the spots near inner hole in the fore end surface of the grain were measured. Using three dimensional linear viscoelasticity finite element model, numerical simulation was performed. The deformation of solid propellant grain under axial acceleration was investigated. The result shows that the difference between calculation and experiment is comparatively little. It is approved that viscoelasticity finite element model can be used to the deformation study of grains under accelerations.