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为了研究真实航空发动机机匣的包容性,对平板条叶片以不同初始速度撞击矩形靶板的侵彻机理进行了数值仿真研究。通过分析撞击过程中叶片加速度、速度、位移的变化,了解了与试验相符的撞击、变形、撕裂和失效过程。利用有效的数值模型验证了叶片初始速度与残余速度之间的关系满足Recht-Ipson公式,且工程中常用的破坏势能法可用于初步预测残余速度。
In order to study the inclusiveness of a true aero-engine casing, the numerical simulation of the penetration mechanism of a slab with different initial velocity is carried out. By analyzing the changes of the acceleration, velocity and displacement of the blade during the impact, the impact, deformation, tearing and failure process in accordance with the experiment are understood. The effective numerical model is used to verify that the relationship between the blade initial velocity and the residual velocity satisfies the Recht-Ipson formula, and the destructive potential method commonly used in engineering can be used to predict the residual velocity.