Abstract Considering the effect of air ingestion, a three-dimensional CFD model of open ends squeeze film damper (SFD) was established based on transient time step solution method and dynamic mesh technique. And the model was experimentally verified by bidirectional excitation experiment. Experiment and CFD simulation shows that air ingestion was caused by the pressure difference between oil film and external environment. With increasing precession frequency and eccentricity ratio, air ingestion area is gradually expanding resulting in increasing air volume, shrinking effective coverage of oil film and performance degradation of damper. Thereby, oil film damping shows the tendency to reduce. Compared with the case without considering air ingestion, the case considering air ingestion has obviously smaller peak pressure in the CFD simulation.

中文翻译：

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吸入空气对挤压油膜阻尼器减振性能的影响分析

摘要 考虑进气的影响，基于瞬态时间步长求解方法和动态网格技术，建立了开口端挤压油膜阻尼器（SFD）的三维CFD模型。并通过双向激励实验对模型进行了实验验证。实验和 CFD 模拟表明，空气吸入是由油膜与外部环境之间的压力差引起的。随着进动频率和偏心比的增加，进气面积逐渐扩大，导致风量增加，油膜有效覆盖范围缩小，阻尼器性能下降。因此，油膜阻尼显示出降低的趋势。与不考虑进气的情况相比，考虑进气的情况在CFD模拟中的峰值压力明显较小。