Abstract：The instability of rotor nonlinear motion is usually induced by seal steam flow excitation. A seal model of high-pressure cylinder diaphragm in 1000 MW unit was established. The fitting model of seal nonlinear flow exciting force obtained by mesh deformation simulation technology and multi-frequency whirling model. The motion coupling model of rotor-bearing-seal system with nonlinear oil film force were established based on rotor dynamics theory, and the influence of seal nonlinear flow exciting force on the system motion characteristics were analyzed. The results show that: the numerical fitting model of seal nonlinear flow exciting force has good accuracy and is closer to the actual situation. In the process of speed-up, the unbalance response of rotor and the instability of system induced by nonlinear oil film force are the main factors. For different pressure ratio conditions, after the rated speed operation, when the load is constant, the larger the pressure ratio, the more obvious the steam flow excitation phenomenon. With the increase of load, the influence of steam flow excitation is significantly enhanced, and the influence of pressure ratio on steam flow excitation is also intensified, which increases the influence of seal steam flow excitation and leads to serious instability of the system.
曹丽华，高路路，司和勇. 超超临界汽轮机密封非线性汽流激振力影响的转子运动特性[J]. 振动与冲击, 2023, 42(21): 29-35.
CAO Lihua, GAO Lulu, SI Heyong. Rotor dynamic characteristics affected by seal nonlinear steam flow excitation force in ultra supercritical steam turbine. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(21): 29-35.
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