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首页> 外文期刊>Advances in Mechanical Engineering >Numerical analysis of fluid-added parameters for the torsional vibration of a Kaplan turbine model runner:
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Numerical analysis of fluid-added parameters for the torsional vibration of a Kaplan turbine model runner:

机译：Kaplan涡轮模型流道扭转振动的加液参数的数值分析：

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The impact of fluid on the runner of a hydraulic turbine is a recurrent problem. Fully coupled fluid–structure simulations are extremely time-consuming. Thus, an alternative method is required to estimate this interaction to perform a reliable rotor dynamic analysis. In this article, numerical estimations of the added inertia, damping, and stiffness for a Kaplan turbine model runner are presented using transient flow simulations. A single-degree-of-freedom model was assumed for the fluid–runner interaction, and the parameters were estimated by applying a harmonic disturbance to the angular velocity of the runner. The results demonstrate that the added inertia and damping are important, whereas the stiffness is negligible. The dimensionless added polar inertia is 23%–27% of the reference value (ρR5). Damping significantly contributes to the moment at low excitation frequencies, whereas the inertia becomes dominant at higher frequencies.
机译：流体对水轮机转轮的冲击是一个经常出现的问题。完全耦合的流体结构模拟非常耗时。因此，需要一种替代方法来估计这种相互作用，以执行可靠的转子动态分析。在本文中，使用瞬态流动模拟对Kaplan涡轮模型流道的附加惯性，阻尼和刚度进行了数值估算。假设流体与流道相互作用为单自由度模型，并通过对流道角速度施加谐波干扰来估计参数。结果表明，增加的惯性和阻尼很重要，而刚度可以忽略不计。无量纲的附加极惯性为参考值（ρR5）的23％–27％。在低激励频率下，阻尼会明显影响力矩，而在较高激励频率下，惯性将占主导地位。

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