Unsteady load on an oscillating Kaplan turbine runner

Puolakka, Otto; Matusiak, Jerzy

doi:10.1016/j.jfluidstructs.2012.12.002

Cited by 12 publications

(7 citation statements)

References 15 publications

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“…Nonetheless, both our results and those of Karlsson et al have a similar overall trend. The magnitude of the added damping is in good agreement with the findings of Puolakka et al 20 at lower frequencies (5-70 Hz) but not at higher perturbation frequencies (.70 Hz). As the operating conditions and geometry of the turbines in these two studies differ from those in our case, differences in the results are expected.…”

Section: Resultssupporting

confidence: 91%

“…20 r, R, and U are the flow density, runner radius, and blade tip velocity, respectively. The added polar inertia is reasonably consistent with the study of Puolakka et al 20 There is a significant discrepancy between the findings of Karlsson et al 18 and our results, despite the similar qualitative behaviors. This discrepancy may be due to the smaller number of runner blades, lower head, and lower flow rate of the investigated turbine.…”

Section: Resultssupporting

confidence: 88%

“…The stiffness is shown as a function of the perturbation frequency in Figure 11. Following the zero-stiffness method presented above, the obtained added polar and damping are compared with the results of the study of Puolakka et al 20 and Karlsson et al 18 in Figures 12 and 13. The added properties are presented in dimensionless form using the reference values of rR 5 and rR 4 U for the added polar inertia and added damping, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…In other studies, the right-hand side of equation ( 5) is expressed using only a frequency-dependent added inertia to obtain the added mass of the Kaplan runner. 20 The added inertia and damping can be calculated directly without considering the added stiffness in the set of equations.…”

Section: Modeling Of the Systemmentioning

confidence: 99%

“…The added mass increased with increases in the number of blades and runner diameter. Puolakka et al 20 used the same analytical method to examine three Kaplan runners with variations in several characteristics, such as the blade number, specific speed, tip clearance, and hub ratio. The added mass and damping in the polar, axial, and polar-axial directions for the runners were compared with the FE simulations.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Numerical analysis of fluid-added parameters for the torsional vibration of a Kaplan turbine model runner

Dehkharqani

Cervantes

Aidanpää

2017

Advances in Mechanical Engineering

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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 (rR 5 ). Damping significantly contributes to the moment at low excitation frequencies, whereas the inertia becomes dominant at higher frequencies.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Modeling Of the Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical analysis of fluid-added parameters for the torsional vibration of a Kaplan turbine model runner

Dehkharqani

Cervantes

Aidanpää

2017

Advances in Mechanical Engineering

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Estimation of added effects and their frequency dependence in various fluid–structure interaction problems

Urban,

Pochylý,

Habán

2024

J Braz. Soc. Mech. Sci. Eng.

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This paper focuses on a fluid–structure interaction topic—the determination of added effects caused by fluid forces acting on a body, considering the standard linear equation of motion. We present various problems that assume small-displacement oscillations of single and multiple bodies in inviscid irrotational (potential) flow or viscous incompressible flow in both closed domain and external flow. For inviscid flow, effects of geometric parameters on the added effects were studied. The presented results extend results known from the literature. For viscous flow, frequency dependence of the added effects was studied for a wide range of frequency. The added effects were computed from data from numerical simulations of fluid flow, where the body oscillations were modeled using the dynamic mesh approach. Effects of the phase shift caused by the dynamic mesh were addressed. The added mass was compared with the corresponding value determined for inviscid flow where applicable. The results show strong dependence of the added effects on many parameters, making their proper computation challenging even for simplified cases.

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Multibody dynamics analysis of a Kaplan turbine runner in full operating conditions

Luo

Yang

Cao

et al. 2023

Journal of Energy Storage

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Unsteady load on an oscillating Kaplan turbine runner

Cited by 12 publications

References 15 publications

Numerical analysis of fluid-added parameters for the torsional vibration of a Kaplan turbine model runner

Numerical analysis of fluid-added parameters for the torsional vibration of a Kaplan turbine model runner

Estimation of added effects and their frequency dependence in various fluid–structure interaction problems

Multibody dynamics analysis of a Kaplan turbine runner in full operating conditions

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