Abstract
Foreign object damage (FOD) is one of the main limiting factors for the life of aero-engine blades. In order to summarize the impact law and predict the damage gap caused by the impact of foreign objects on titanium alloy blades, the dynamic simulation calculation of foreign object damage at the inlet edge of an aero-engine guide vane was carried out with a specific blade as the research object, a cylindrical steel nail with high probability on the airport pavement as the foreign body and the most possible angle caused by the inlet flow field as the impact angle. The study found that: (i) The notch depth consists of two components: the initial depth at impact and the subsequent expansion due to centrifugal stress. (ii) The depth of the notch is always greater than the width. The maximum width of the notch is approximately equal to the cross-sectional diameter of the steel column. (iii) The relationship between notch depth and notch width is a quadratic function. (iv) The changes of notch depth with relative kinetic energy and steel column mass, and the changes of impact angle, maximum impact force and impact time with steel column mass are all power functions. With the increase of impact position, the relative kinetic energy of the steel column increases, and the change law is a quadratic function. (v) For the same foreign object, there is a critical value when the impact height increases. When the impact position is lower than it, the notch depth increases continuously. On the contrary, the notch depth decreases. Similarly, there is a critical value in the process of increasing relative kinetic energy. Smaller than it, the notch depth continues to increase, while larger than it, the notch depth continues to decrease. These findings provide data to support the diagnosis of blade damage under field conditions, and provide a theoretical basis for the design of blades against foreign object damage.
Go to article
en
pl
