基于动网格技术的抛鸟运动轨迹分析

发动机吞鸟试验是检验航空发动机安全性和可靠性的重要手段，为了探究在发动机吞鸟试验中，鸟体出膛后飞行轨迹的变化，优化抛鸟策略，采用动网格技术，使用六自由度模型对鸟体出膛后的轨迹进行计算分析，结果表明：鸟体出膛后，其肩部会形成一个高压区域，尾部形成一个低压区域，由此产生气动阻力，在运动方向阻力最大，在飞行过程中阻力会稳定在某一数值；运动方向垂向和横向所受气动力很小，但数值波动较大，且变化无规律；鸟体飞行过程中速度衰减小，弹道平直，可以采用直瞄的方式将鸟体抛向指定的位置。

Trajectory Analysis of Bird Throwing Based on Dynamic Grid Technology

The bird ingestion test is an important means of verifying the safety and reliability of aviation engines. In order to investigate the variation of flight trajectory after the ejection of bird body in engine bird ingestion tests and optimize bird ejection strategies, dynamic mesh technique was employed to calculate and analyze the trajectory of bird body using a six-degree-of-freedom model. The results indicate that after the ejection of bird body, a high-pressure region is formed at the shoulder area while a low-pressure region is formed at the tail. This generates aerodynamic drag, with the maximum drag occurring in the direction of motion. The drag force stabilizes at a certain value during the flight process. The aerodynamic forces acting on the bird body in the vertical and lateral directions are small, but exhibit large fluctuations with no regular pattern. The bird body experiences minimal speed decay during flight and follows a straight trajectory, making it feasible to launch the bird body to the desired location using direct aiming.