A method of calculating bird strike high speed rotation engine blade

Abstract

The invention relates to a numerical simulation method for calculating response of bird strike on an engine blade. Based on a smooth particle method (Smoothed Particle Hydrodynamics SPH) and a finiteelement method (Finite Element Method FEM), a numerical simulation model considering the impact environment factor influence of the bird body attitude angle is established, and dynamic response simulation is carried out under the model. In addition, technicians in the field can more simply modify different parameters for research in the bird impact dynamics response research process, and a reference basis is provided for research on the design and optimization of the aero-engine structure.

Description

technical field [0001] The invention belongs to the field of impact dynamics modeling, and in particular relates to a simulation method for calculating the response of a bird hitting an engine blade. Background technique [0002] The SPH method is a meshless method, which is a Lagrangian particle method for simulating fluid flow, unlike the finite element method, which requires precise mesh division of the computational domain. The SPH method uses a series of particles with physical quantities such as mass, density, velocity, and acceleration to solve integral equations or partial differential equations with various boundary conditions to obtain accurate solutions. [0003] The problem of bird collision has been a serious threat to the safety of aviation aircraft. In order to reduce property losses and improve the safety of aircraft, numerical calculations and experiments are used to improve the crashworthiness of aircraft structures. The numerical analysis method is used t...

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Problems solved by technology

[0005] In the article "Numerical and experimental investigation of the shock andsteady state pressures in the bird material during bird strike", Frederik carried out three different sets of comparative experiments, using a circular plate, wedge and beam splitter. He found that the gelatin model and The impact force and momentum of a real bird body are almost the same when it hits a flat plate and a wedge. At the same time, he introduced another method to measure the momentum conversion, further illustrating the feasibility and accuracy of gelatin instead of the bird body model, but he Does not take into account the motion of the target

Wen Yingjuan conducted a transient response experiment of a bird impacting a blade plate in the article "Blade Bird Impact Response Analysis Modeling Technology and Verification Research", measured the displacement time curve of the blade tip, and combined the approximate elastoplastic material model and fluid dynamics Compared with the material model of different materials, the sensitivity of each material parameter change to the response of the blade was analyzed, and the finite element method was used to compare different bird body contact modes, and the results of different parameters to the response of the blade were evaluated, but in her The study did not address blades that considered curvature

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