论文部分内容阅读
为了解航空发动机直通型篦齿封严诱导的鼓筒表面气流激振状态以及不同参数对其的影响,对航空发动机直通型篦齿封严诱导的气流激振力进行研究,对转子无偏心和有偏心两种情况进行数值仿真计算。定性分析不同偏心量、不同进动频率比对气动力的影响;利用数值计算结果确定篦齿封严诱发的气流激振力大小;根据不同进动频率下的静压分布可以进一步导出气动阻尼、气动刚度参数,得到篦齿封严转子的气动载荷边界条件。结果表明:无偏心时篦齿封严腔内的流动非定常性不明显,气流激振对篦齿封严转子的影响可基本忽略;转子存在偏心时流体腔内流动具有非定常特征,气流激振力将驱动转子进动运动;不同偏心量的静压值比无偏心量时最大可增长7%,静压幅值波动值随进动频率比增大而增大,最大可比进动频率比为0时增长达84%,对转子的动力学稳定性有一定影响。
In order to understand the dynamic induced vibration of drum surface and the influence of different parameters on aero-engine straight-through labyrinth seal, the aero-engine excitation force induced by the straight-through labyrinth of aeroengine is studied. There are two cases of eccentric numerical simulation. The influence of different eccentricity and different precession frequency ratio on the aerodynamic force is qualitatively analyzed. The results of numerical calculation are used to determine the excitation force of the labyrinth seal. According to the static pressure distribution at different precession frequencies, the aerodynamic damping can be further derived. Pneumatic stiffness parameters, get the labyrinth sealed rotor aerodynamic loading boundary conditions. The results show that the unsteady flow in the labyrinth seal chamber is not obvious when the eccentricity is not exceeded. The influence of air-flow excitation on the trochoid seal rotors can be neglected. When the rotor is eccentric, the flow in the fluid chamber has unsteady characteristics. The vibration force will drive the precession movement of the rotor. The static pressure value of different eccentricity can increase up to 7% more than that without eccentricity. The fluctuation value of the static pressure amplitude increases with the increase of the precession frequency. The maximum precessional frequency ratio It increases by 84% at 0, which has certain influence on the dynamic stability of the rotor.