鸟撞过程中撞击位置与撞击姿态对风扇叶片损伤影响研究

Abstract

To study the influence of bird impact position and impact posture on the transient response of a fan blade, a smooth particle hydrodynamics (SPH) mallard model established by CT scanning was used to simulate the process of a real bird strikes a high-speed rotating fan with five different impact positions and fifteen different impact attitudes according to the relative speed principle. The effect of impact position and attitude on the transient stress and displacement of the fan blade was obtained. Results show that during the impact process, stress concentration is likely to occur in the blade root and the leading edge, these areas are most susceptible to damage and deformation, and the anterior root has greater stress than the posterior root, which is more likely to be damaged. The impact force on the blade and the stress at the blade root and the leading edge are the largest when the bird strikes the 2/6 blade height position. In the Y-135°, Y-270°, Y-315°, Z-135° and Z-315° impact postures, the equivalent stress of the anterior root is the largest. In the Z-135 impact posture, the equivalent stress of the posterior root is the largest, and the displacement of the leading edge is the largest in the Y-270° impact posture. The results of this study have reference value for the design of anti-bird impact and airworthiness evaluation of fan blades in aero-engine.