航空发动机转子篦齿封严诱导的气流激振力分析

发布时间：2018-11-23 17:14

【摘要】：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。
[Abstract]:In order to understand the airflow excited state of the cylinder surface induced by the straight through grate tooth seal and the effect of different parameters on it, the airflow excitation force induced by the straight through grate seal of the aeroengine was studied. The rotor with no eccentricity and with eccentricity is numerically simulated. The effect of different eccentricity and precession frequency ratio on aerodynamic force is analyzed qualitatively, and the magnitude of airflow excitation force induced by labyrinth seal is determined by numerical calculation results. According to the static pressure distribution at different precession frequencies, the aerodynamic damping and aerodynamic stiffness parameters can be further derived, and the aerodynamic load boundary conditions of the labyrinth seal rotor can be obtained. The results show that the unsteady flow in the labyrinth seal cavity is not obvious without eccentricity, and the effect of airflow excitation on the rotor can be neglected. When the rotor has eccentricity, the fluid flow in the cavity has unsteady characteristics, and the rotor precession will be driven by the airflow excitation force. The static pressure of different eccentricities can increase by 7% compared with that without eccentricity. The fluctuation value of static pressure amplitude increases with the increase of precession frequency ratio, and increases to 84% when the maximum comparable precession frequency ratio is 0, which has a certain effect on the dynamic stability of rotor.
【作者单位】：清华大学机械工程系;
【基金】：国家自然科学基金(11272170;11472148) 北京市自然科学基金(3143024)
【分类号】：V231.9

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