Abstract: Studied the numerical simulation method of bird strikes on aero-engine fan blades. Firstly, established a multi-resolution SPH-FEM coupling method. By setting a group of background particles at the interpolation points inside the FEM elements, reduced the consistency requirement of model discrete scale at the coupling interface in the traditional coupling method. In addition, in order to reduce the computational cost, proposed a finite element adap-tive generation algorithm. The algorithm works by adding a kind of element adaptive generation algorithm and non-reflecting boundary condition into the traditional finite element algorithm, so that the computational process changed from calculating all elements in traditional calculation process to calculating part of elements at critical areas. Using the above algorithm, conducted numerical simulations of bird strikes, researched the impact process of the fan blades by multi-structure bird models with different materials. revealed the damage mechanism of the blades during bird strikes by multi-structural birds models and also verified the effectiveness of the algorithm. It is of great significance for the design of bird strike resistance for aero-engine fan blades and the improvement of flight safety.

Key words: aero-engine, fan blade, SPH-FEM, bird strike, numerical simulation