Sun Dan, Li Sheng-Yuan, Zhao Huan, Fei Cheng-Wei
Liaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System, Shenyang Aerospace University, Shenyang 110136, China.
School of Power and Energy, Northwestern Polytechnical University, Xi'an 710072, China.
Materials (Basel). 2019 Jul 21;12(14):2324. doi: 10.3390/ma12142324.
To study the influence of taper seal clearance on the static and rotor-dynamic characteristics of hole-pattern damper seals, this paper develops three-dimensional transient computational fluid dynamic methods, which comprise single-frequency and multi-frequency elliptical orbit whirl model, by the transient solution combined with a mesh deformation technique. Through the investigations, it is illustrated that: (1) In the present paper, the leakage rates of convergent-tapered hole-pattern damper seals are less than divergent-tapered hole-pattern damper seals for the same average seal clearance, and the maximum relative variation reaches 16%; (2) Compared with a constant clearance hole-pattern damper seal, the maximum relative variation of the rotor-dynamic coefficients is 1,865% for nine taper degrees in this paper; (3) Convergent-tapered hole-pattern damper seals have smaller reaction forces and effective damping coefficient, larger cross-over frequency, and direct stiffness coefficient, while divergent-tapered damper seals have the opposite effects; (4) Divergent-tapered hole-pattern damper seals alleviate the rotor whirl because of a larger effective damping coefficient when the rotor system has large natural frequency and small eccentricity. Convergent-tapered damper seals provide both sealing and journal bearing capabilities at the same time, and are more advantageous to the stability of the rotor system when rotor eccentricity is the main cause of rotor instability.
为了研究锥度密封间隙对孔型阻尼器密封静态和转子动力学特性的影响，本文通过瞬态求解结合网格变形技术，开发了三维瞬态计算流体动力学方法，该方法包括单频和多频椭圆轨道涡动模型。通过研究表明：（1）在本文中，对于相同的平均密封间隙，收敛锥度孔型阻尼器密封的泄漏率小于发散锥度孔型阻尼器密封，最大相对变化率达到16%；（2）与恒定间隙孔型阻尼器密封相比，本文中九个锥度下转子动力学系数的最大相对变化率为1865%；（3）收敛锥度孔型阻尼器密封具有较小的反作用力和有效阻尼系数、较大的交叉频率和直接刚度系数，而发散锥度阻尼器密封则具有相反的效果；（4）当转子系统固有频率大且偏心率小时，发散锥度孔型阻尼器密封由于有效阻尼系数大而减轻了转子涡动。收敛锥度阻尼器密封同时具备密封和径向轴承能力，当转子偏心率是导致转子失稳的主要原因时，收敛锥度阻尼器密封对转子系统的稳定性更有利。
