脉冲发动机喷管喉衬故障的计算与分析

为了解决脉冲发动机喷管喉衬曾出现过从其喷管座中打出的故障问题,利用MSC Patran 2004r2有限元软件对脉冲发动机喷管喉衬进行了强度分析.选用了三角形轴对称单元,用PCL语言编写了施加变压力载荷的程序,采用高压密封容器对整个喷管作了静压试验,分析了载荷、位移约束和材料性能对喉衬最大应力的影响.结果表明,喉衬支撑结构的耐烧蚀性能没有满足使用要求.经过试验验证,采用将支撑结构改进成镶嵌更耐烧蚀的金属衬套的复合结构措施的喷管,工作正常,结构完好.

An Analysis on Faults in the Nozzle Throat Insert of a Pulse Motor

In solving problems of breakage in nozzle throat inserts for a pulse motor,analysis on the strength of nozzle throat insert have been carried out using the MSC Patran 2004r2 finite element soft-ware.Triangular elements for axial symmetry structure were selected.Programs of variational pressure load were written with the PCL language.Compression resistance experiments to the whole nozzle were finished in a sealed container with high pressure.Relations of load,displacement restriction and material performance versus the maximum stress of the nozzle throat insert are here analyzed.The result of analysis showed that the anti-ablation property of the supporter for throat insert is not sufficient.The supporter for throat insert was then changed into one made of composite having a metal bush of higher anti-ablative property.Tests proved that the improved nozzles are effective and that their structures are successful.