某型涡轴发动机性能衰减与部件退化评估

Performance degradation and components deterioration degree estimation for a turboshaft engine

为在某型涡轴发动机持久试验中进行性能健康检查,采用多点匹配方法建立了个体发动机性能衰减计算模型,基于非线性气路分析方法对部件性能退化进行了计算,集合已有经验确定性能偏离部件,完成了某型发动机持久试验中不同阶段的性能衰减评估.结果表明,某型发动机性能衰减及部件性能退化成阶段性分布,前期压气机和燃气涡轮性能变化最快,随后处于相对稳定阶段,动力涡轮性能在目前试验时数范围内基本无变化.该方法的验证为涡轴发动机使用过程中的性能健康与评估提供了有益的经验.

To monitor the performance and health conditions of a turboshaft engine dur- ing an endurance test, an engine mathematical model was set up and adapted to its real per- formance by adjusting component maps using a multiple-point performance adaption method. Gas path diagnostic analysis of the engine based on a non-linear gas path analysis （GPA） methodology was performed. In combination with field experiences, evaluation of the engine gas path component deterioration during an engine endurance test was carried out. The re- sults indicated that the engine performance deviation and component deterioration varied over time. During initial phase of the test, the performance of the compressor and the compressor turbine deviated most rapidly then stabilized afterwards. As for the power turbine, the health was almost unchanged during the entire endurance test. The validation and experience of the GPA diagnostic technique prove that the technology can be applied into engine per- formance and health check for the evaluation of health of the turboshaft engine in its future service.