Effect of Bird Strike on Compressor Blade

Abstract

Certification requirement demands for civil and military aircraft to withstand the impact of foreign object damage at critical flight conditions. Experimental tests for conducting bird impact analysis are costly and time-consuming, and thus an accurate solution for designing a component against bird impact is important. Bird impact on aircraft is a soft body impact; it requires the density of a fluid, viscosity, and shape of bird projectile and length to diameter ratio should be precisely selected. This paper investigates the effect and influence of all such parameters due to bird impact. The initial degradation and failure of individual compressor blades struck by a bird were investigated. Subsequent damage to other fan blades and engine components is also evaluated. Results will be compared in terms of pressure profile, and stagnation pressure at the center of the impact and the bird trajectory after the impact. The bird strike velocity varied from 190 to 250 m/s. A numerical model of this problem has been developed with the finite, non-nuclear element program LS-DYNA. This paper presents the bird strike analysis using Lagrangian, Arbitrary Lagrangian Eulerian (ALE) method, and Smooth Particle Hydrodynamic (SPH) technique in LS-DYNA. Throughout the study, the most influencing parameters have been identified and peak pressures and forces are compared to those results available in the literature.