航空发动机风扇机匣包容性等效试验与分析方法

Equivalent test and simulation verification for fan containment case of aero engine

针对硬壁机匣包容性问题,提出在发动机研制初期,通过风扇包容机匣等效试验件靶板冲击试验,模拟真实风扇叶片脱落机匣包容性过程,并通过材料高应变率试验拟合机匣材料在高应变率下的本构模型;建立基于简化试验结果的数值仿真模型标定及机匣包容性分析模型修正方法,对风扇叶片脱落机匣包容性分析模型进行标定,建立高精度风扇机匣包容性仿真预测模型,用于风扇叶片脱落适航取证试验前仿真预测,以提高试验成功率、减少试验次数。通过数值仿真可拟合获得机匣包容厚度与叶片脱落载荷的关系,为风扇包容机匣设计提供厚度参数输入参考。

The containment for fan blade-out is the key of airworthiness certification to commercial turbofan aero engine. The airworthiness certification authorities have developed very strict technical requirements and validation criteria. However, as a destructive test, the fan blade-out test is very expensive. In the paper, for hard-wall casing, the target plate impact test was puts forward, which simulates the real fan blade-out process. Through high strain rate test of case material, a material model including the high strain rate effect was built. Then by the analysis on the test parameters, high-precision simulation models were established to evaluate the containment capability of the fan case. The high- precision simulation models can simulate the fan blade-out test to increase the success rate of the test. Moreover, based on the simulation models, the relationship between thickness of the fan case and the load of fan blade-out can be obtained.