Technique Analysis To Improved Intensity Of Aeroengine Holistic Impeller

The widely applied holistic impellers are ones of the vital components in aeroengines. The high performance of modern aeroengines requires the design of holistic impellers with higher speed and pressure and less weight. This results in higher stresses and lager displacements in the holistic impellers. The trade-off between strength and weight has become more and more difficult. The theories and the methods of the optimal design are systematically investigated in order to provide more efficient and more advanced methods for the design of holistic impellers in this paper.In the paper, the structure and load characteristics and fault modes of the holistic impellers used in the aero-engine are studied. Because of the internal material characteristic that performance of inherence and process is lower than that of the overseas material, the life of the holistic impellers is too low. In order to meet the trend of the aeroengine development, the design optimization on the holistic impellers was brought forwards based on the study, in particular the strength and life aspects. The cycle and symmetry Finite Element Method Analysis applied to the strength of the holistic impellers was introduced in detail. The choice of the design variables, object function, restriction function and the optimization arithmetic were described in the aspect of design optimization. The design optimization method and the special program used in the holistic impellers was established. The application research in the end was presented to validate the design method. The design adopted structural style of two circular arc link, The stress level of the holistic impellers is evidently reduced, and the life is improved. The special program is used to design the holistic impellers applied in aeroengine.