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在发动机风扇叶片外物损伤研究中,为保证获得的叶片损伤数据正确可信,要求准确给定外物撞击风扇叶片的速度及位置坐标,外物吸入轨迹成为了研究的前提和难点问题。针对上述问题,利用计算流体动力学方法,建立了发动机风扇流场的仿真模型。对比研究3组不同初始条件下,硬物在发动机流场中的吸入轨迹,获得撞击在风扇叶片上的位置坐标和速度。仿真结果表明:尽管硬物在流场中的初始位置相差较多,但吸至进气道口时几乎已为相同位置,撞击到风扇叶片的位置都比较集中,大多集中在YOZ截面中心线下方靠近叶尖位置。仿真结果为航空发动机风扇叶片的损伤试验提供理论依据。
In the study of the foreign body damage of the engine fan blade, in order to ensure the correct and credible data of the blade damage, it is required to accurately give the velocity and the position coordinate of the foreign blade impacting the fan blade. The trajectory of the foreign object suction has become a prerequisite and difficult issue for the study. In view of the above problems, the computational fluid dynamics method is used to establish the simulation model of the fan flow field in the engine. Contrasting the inhalation trajectory of hard objects in the flow field of the engine under three different initial conditions, the position coordinates and velocity of the impact on the fan blades were obtained. The simulation results show that although the initial positions of the hard objects in the flow field are quite different, they are almost the same position when they are sucked into the intake port, and the positions of the impact on the fan blades are concentrated, mostly below the center line of the YOZ section Tip position. The simulation results provide a theoretical basis for the damage test of aeroengine fan blades.