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Interaction between Uneven Cavity Length and Shaft Vibration at the Inception of Synchronous Rotating Cavitation

机译:同步旋转空化开始时空腔长度与轴振动之间的相互作用

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Asymmetric cavitation is known as one type of the sources of cavitation induced vibration in turbomachinery. Cavity lengths are unequal on each blade under condition of synchronous rotating cavitation, which causes synchronous shaft vibration. To investigate the relationship of the cavity length, fluid force, and shaft vibration in a cavitating inducer with three blades, we observed the unevenness of cavity length at the inception of synchronous rotating cavitation. The fluid force generated by the unevenness of the cavity length was found to grow exponentially, and the amplitude of shaft vibration was observed to increase exponentially. These experimental results indicate that the synchronous shaft vibration due to synchronous rotating cavitation is like self-excited vibrations arising from the coupling between cavitation instability and rotordynamics.
机译:不对称气蚀是涡轮机械中由气蚀引起的振动的一种来源。在同步旋转空化条件下,每个叶片的腔长不相等,这会导致同步轴振动。为了研究具有三个叶片的空化诱导器中腔长,流体力和轴振动之间的关系,我们观察到同步旋转空化开始时腔长的不均匀性。发现由空腔长度不均匀性产生的流体力呈指数增长,并且观察到轴振动的幅度呈指数增长。这些实验结果表明,由同步旋转空化引起的同步轴振动就像由空化不稳定性和转子动力学之间的耦合引起的自激振动一样。

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