摘要
为研究鸟撞风扇叶片过程中撞击位置及撞击姿态对风扇叶片瞬态冲击响应的影响,通过CT扫描建立光滑粒子流体动力学(smooth particle hydrodynamics,SPH)绿头鸭模型,根据相对速度原则对五个撞击位置和十五种撞击姿态的旋转风扇-鸟体撞击过程进行模拟。获得了撞击位置及撞击姿态对叶片不同位置应力响应及位移响应的影响规律。结果表明:在鸟撞叶片过程中叶片前后叶根以及前后缘易发生应力集中,在撞击过程中该区域最易发生损伤变形,且前叶根要比后叶根受到的应力更大,更易发生损伤变形;鸟撞击2/6叶高位置时,叶片受到的撞击力、叶根处及前缘处应力最大;Y-135°、Y-270°、Y-315°、Z-135°及Z-315°撞击姿态下前叶根受到的等效应力最大,Z-135°撞击姿态下后叶根受到的等效应力最大,Y-270°撞击姿态下前缘接触处位移最大。研究结果对航空发动机风扇叶片抗鸟撞设计及适航评估具有参考价值。
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.
作者
郭鹏
刘志远
张桂昌
Reza Hedayati
张俊红
GUO Peng;LIU Zhiyuan;ZHANG Guichang;REZA Hedayati;ZHANG Junhong(Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control,School of Mechanical Engineering,Tianjin University of Technology,Tianjin 300384,China;State Key Laboratory of Engine,Tianjin University,Tianjin 300350,China;Aeronautical Engineering Institute,Civil Aviation University of China,Tianjin 300300,China;Delft University of Technology,Faculty of Aerospace Engineering,Delft 2600AA,Netherlands)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第12期124-131,共8页
Journal of Vibration and Shock
基金
国家自然科学基金民航联合研究基金(U1833108)
天津市自然科学基金青年基金(18JCQNJC05500)。
关键词
鸟撞
撞击姿态
撞击位置
撞击响应
风扇叶片
bird strike
impact position
impact posture
impact response
fan blade
