Modal behavior of a reduced scale pump-turbine impeller. Part 1: Experiments

Escaler, Xavier; Hütter, J K; Egusquiza, Eduard; Farhat, Mohamed; Avellan, François

doi:10.1088/1755-1315/12/1/012116

Cited by 10 publications

(13 citation statements)

References 12 publications

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“…Several works devoted to investigating the modal behavior and dynamic responses of hydraulic turbine runners both in air and water can be found in the literature based on FEM and AFSCM [4][5][6][7][8][9][10][11][12][13][14][15]. In all cases, the numerical results have shown a good agreement with the corresponding measured ones, which fully validates the feasibility of FEM and AFSCM for the current study.…”

Section: Usupporting

confidence: 79%

“…Finally, the complete finite element discretized equations with assembled form expressed in Equation (14) can be used to solve acoustic fluid-structural coupling problems by considering Equations (12) and (13) simultaneously:…”

Section: Umentioning

confidence: 99%

“…Extensive research has been carried out to measure and characterize the vibrations and dynamic stresses induced by pressure fluctuations in Francis turbines [6,7] and pump-turbines [8,9]. Many research works have been carried out to predict the dynamic behavior of Francis runners in air and still water based on both measurements and simulations in reduced scale models of Francis runners [10,11] and pump-turbines [12,13]. The final objective is to identify the natural frequencies and the damping ratios of the runner, taking into account the added mass and damping of the surrounding water, because it has been demonstrated that these effects can considerably affect the results [14].…”

Section: Introductionmentioning

confidence: 99%

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Added Mass Effects on a Francis Turbine Runner with Attached Blade Cavitation

Huang

Escaler

2019

Fluids

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To have a safe structural design, an analysis of the dynamic behavior of a Francis turbine runner with consideration of the added mass effects of surrounding water is necessary during design phase. Both in design and at off-design operations, large-scale forms of attached cavitation may appear on runner blades and can change the added mass effects of the surrounding fluid in relation to a single water domain. Consequently, a numerical investigation of the modal response of a Francis runner has been carried out by reproducing the presence of various sizes of leading edge cavitation (LEC) and trailing edge cavitation (TEC). The fluid–structure interaction problem has been solved by means of an acoustic-structural coupling method. The calculated added mass effects with cavitation have been compared with those corresponding to the pure water condition without cavitation. Firstly, a single blade has been investigated to evaluate the level of significance for the proposed cavity shapes and dimensions. Afterwards, based on the results obtained, the complete runner structure has been considered, factoring in similar cavity shapes and locations. The results prove that significant added mass effects are induced on the entire runner by the attached cavitation that increase the natural frequencies of the first modes. Moreover, the added mass effects increase with cavity size and amplitude of blade deformation below the cavity.

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Section: Usupporting

confidence: 79%

Section: Umentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Added Mass Effects on a Francis Turbine Runner with Attached Blade Cavitation

Huang

Escaler

2019

Fluids

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“…These impellers are one of 6 blades [12] and another of 9 blades [9]. The response characteristics of all the impellers have some similarities.…”

Section: Comparison With Other Impellersmentioning

confidence: 99%

“…There are even fewer references available for this type of impeller, especially for a prototype. Some results in reduced-scale models and prototypes are available in air and water but without casing [9,10]. The frequency response of prototype impellers is shown in [11] but no details about the influence of boundary conditions are indicated.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the dynamic response of pump-turbine impellers. Influence of the rotor

Egusquiza

Valero

Presas

et al. 2016

Mechanical Systems and Signal Processing

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a b s t r a c tThis paper deals with the dynamic response of pump-turbine impellers. A pump-turbine impeller is a complex structure attached to a rotor and rotating inside a casing full of water with very small clearances between the rotating and the stationary parts. The dynamic response of this type of structures is very complex and it is very much affected by the connection to the rotor as well as by the added mass and boundary conditions. As a consequence its calculation presents several uncertainties.First, the dynamic response of pump-turbine impellers is introduced. Second an experimental investigation in a real impeller attached to the rotor and inside the machine was carried out. For this investigation, the impeller of an existing pump-turbine unit with an installed power of 110 MW and a diameter of 2.87 m was studied. For a better analysis of the experimental results a numerical model using FEM was also built-up. Frequencies and mode-shapes were identified numerically and experimentally and the characteristics of the structural response analyzed.To determine the influence of the rotor and supporting structures on the impeller response the results were compared with the ones obtained with the same impeller but suspended (non-connected to the rotor). Experimental and numerical simulation were also used for this case. The changes in the dynamic response due to the rotor connection were determined.Finally the results obtained are compared with the results from other pump-turbine impellers of different designs and general conclusions about the dynamics of this type of structures are given.

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Investigation on pressure pulsation and modal behavior of the impeller in a nuclear reactor coolant pump

Zhou

Zhao

Pei

et al. 2021

Energy Science & Engineering

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As the vital component of the nuclear reactor coolant pump (RCP), the impeller plays an indispensable role in driving the coolant in the primary loop in the nuclear power plant. 1,2 The coolant circulation inherently brings flow fluctuation, especially pressure pulsation induced by the rotor-stator interaction, 3,4 and therefore, flow-induced vibration exists, which has a considerable impact on the impeller. Moreover, for the RCP in the actual operation, the impeller operates at a high-temperature, high-pressure, high-radiation, and nonstop environment. 5,6 Hence, it is urgently necessary to make a comprehensive understanding of the unsteady pressure pulsation and vibration characteristics of the RCP impeller.At present, research both into the unsteady pressure pulsation and the vibration characteristic of the RCP impeller

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Modal behavior of a reduced scale pump-turbine impeller. Part 1: Experiments

Cited by 10 publications

References 12 publications

Added Mass Effects on a Francis Turbine Runner with Attached Blade Cavitation

Added Mass Effects on a Francis Turbine Runner with Attached Blade Cavitation

Analysis of the dynamic response of pump-turbine impellers. Influence of the rotor

Investigation on pressure pulsation and modal behavior of the impeller in a nuclear reactor coolant pump

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