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.