Metal blade rotation state bird impact damage engineering estimation method

Abstract

According to the metal blade rotation state bird impact damage engineering estimation method provided by the invention, a real flat simulation blade is subjected to a bird bomb impact test to obtain data, and a continuous damage energy threshold-damage mode curve is drawn through a mathematical formula in combination with the data and is used as a reference for judging whether a newly designed to-be-estimated blade has a damage hidden danger or not; by comparing the unit area damage energy of the blade deformation energy of the to-be-estimated blade impact position with the continuous damage energy threshold-damage mode curve, the blade damage hidden danger and the estimated damage degree can be obtained, and the bird impact damage degree and the bird impact resistance of the metal blade can be preliminarily determined simply, conveniently, quickly and at low cost.

Description

technical field [0001] The invention relates to the field of engine blade damage test. Background technique [0002] Aero-engines are very easy to inhale birds during operation, resulting in impact damage to engine blades, which in turn leads to serious mechanical failures. During design and certification, the anti-bird impact capability proposed by airworthiness regulations or design specifications must be met. Metal blades are currently in use. There is still a wide range of application backgrounds in the structure of military and civilian engines. Therefore, with the continuous improvement of aero-engine performance and safety requirements, the resistance to bird strike damage of its metal blades also needs to be continuously improved and reflected in the early design. In the early stage of metal blade design, the main work is to pay attention to the parameters affecting performance indicators such as blade shape and the corresponding design methods. For the anti-bird imp...

AI Technical Summary

Problems solved by technology

In the early stage of metal blade design, the main work is to pay attention to the parameters and corresponding design methods that affect the performance indicators such as the blade shape. For the bird impact resistance of the blade, generally after the blade design plan is formed, the complex sample static / rotating state bird impact test is carried out. Large-scale full-scale three-dimensional numerical analysis and evaluation of bird impact with rotation state is difficult and costly. In the entire design cycle, there is a lack of a simple, fast, and low-cost early engineering evaluation method to preliminarily determine the bird impact damage of blades The degree and anti-bird strike ability, related methods and processes need to be developed urgently

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