Author(s): Dengfeng Cao; Jiaren Ding; Ye Zhou; Cuiwei Jiang

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Keywords: No Keywords

Abstract: Hammering method is a common solution to the measurement on natural frequency of solid components. Due to the difficulty to directly measure the natural frequency of a rotating runner in the water, numerical simulation is widely applied to predict the runner behaviours. To verify the influence coefficient of the natural frequency in the water than that in the air, specific measurements are taken on a model runner both in the water and air and a prototype runner by hammering method. Test results show that the ratio of natural frequency in the water to in the air lies in 0.692 ∼ 0.753 on the model runner, and 0.746 ∼ 0.812 on the prototype runner. Practice in this paper shows that hammering method is a helpful way to predict the natural frequency of runner blade in the water, then the operation risk of resonance may be avoided.

DOI: https://doi.org/10.1088/1755-1315/1079/1/012061

Year: 2022