Abstract：The protection design criterion is proposed which is used in aero-engine structure static strength design and which requires that some sort of component failure which is less destructive should be occurred so as to prevent an aero engine from heavier damage.The necessity of protection criterion is discussed through practical examples and the definitions of the protecting part, protected part and protecting area are presented. Emphasis is put on the protecting part and protecting area used to prevent disk burst. Mathematical models and steps of protecting area design based on optimization are presented. Examples of protecting parts design of a driving shaft, a blade and a turbine side plate are presented, which theoretically and experimentally indicate that the proposed protect design criteria and method is efficient.

A new methodology for DFSS suitable for the design of a complicated multidisciplinary system such as a gas turbine engine is proposed. There are four phases in this methodology: define, analysis, MDO and verify. More detailed information of each of the four phases was introduced. The design of a diagonal impeller which is used in an aero engine was taken as an example to demonstrate the implementation process of the methodology. In the phase of MDO, computational fluid dynamics, computational structural mechanics simulation methods were used. The mathematic model of DFSS of the diagonal impeller was established and self developed DFSS software was used to solve the model so as to get longer fatigue life, lighter weight and higher aerodynamic performance. The results of the example indicate that the proposed methodology is efficient.

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