|Research on Vibration Spectrum of the Core Pulling Diagonal-flow Pump
|英文关键词: diagonal-flow pump, vibration spectrum, bidirectional FSI
| Some experiments and numerical simulations for the vibration spectrum research were applied to study the fierce vibration problem of large core pulling type inclined flow pumps. The simulation results of comparison between the bidirectional FSI model and the single fluid domain indicate the effective head of bidirectional FSI model is more accurate cy and the rule of inner flow field based on simulation is in accordance with actual flow conditions. The passing frequency of internal hydraulic excitation is 24.5Hz. A first-order modal, obtained by analyzing the rotator based on additional mass method, approaches 44.79Hz. This result matches a minor crest's value which arises near the practical frequency 44.5 Hz. An eccentric ellipse was obtained through testing the axis center track of spindle. The rotating frequency 4.08Hz is identical with the main vibration frequency of measuring spectrum. The results show that the vibration of diagonal-flow pump is caused by the imbalance of rotator.