Influence of rotation on the modal characteristics of a bulb turbine unit rotor

Cao, Jingwei; Luo, Yongyao; Presas, Alexandre; Ahn, Soo-Hwang; Wang, Zhengwei; Huang, Xiaoxu; Liu, Yan

doi:10.1016/j.renene.2022.02.006

Cited by 18 publications

(6 citation statements)

References 27 publications

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“…The calculated head and power are compared with the design parameters of the prototype pump-turbine in Figure 4, and numerical error is defined in Equation (6). The line in Figure 4 represents the calculated results, and the error bar represents the error calculated in Equation (6).…”

Section: Numerical Methods Verificationmentioning

confidence: 99%

“…However, with existing technology, it is difficult to achieve the goal, especially due to the complexity of the Navier-Stokes (N-S) equation. Thus, some researchers have tried to simplify the N-S equation; a widely used method is the acoustic fluid-structural coupling method [6]. He et al investigated the modal characteristics and the dynamic response characteristics of a pump-turbine runner and discussed the added mass effect in detail [7].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Operating Head on Dynamic Behavior of a Pump–Turbine Runner in Turbine Mode

Li¹,

Cao

Zhuang³

et al. 2022

Energies

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Pumped storage units improve the stability of the power grid, and the key component is the pump–turbine. A pump–turbine usually needs to start and shutdown frequently, and the operating head varies greatly due to changes in the water level of the reservoir, which makes the dynamic behavior of a pump–turbine runner extremely complex. This paper investigates the effects of operating head on the dynamic response characteristics of a pump–turbine runner in turbine mode. The flow characteristics of the pump–turbine at maximum head, rated head and minimum head are analyzed, and the dynamic response characteristic of the pump–turbine runner are numerically studied. The results show that operating head can affect the pressure pulsation and dynamic stress characteristics of the pump–turbine runner, but it has little effect on the frequency spectra. The conclusions of this paper intend to improve understanding of the effects of the operating head on the dynamic behavior of the pump–turbine runner, therefore providing a theoretical reference for safe and stable operation of the pump–turbine unit.

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Section: Numerical Methods Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Operating Head on Dynamic Behavior of a Pump–Turbine Runner in Turbine Mode

Li¹,

Cao

Zhuang³

et al. 2022

Energies

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“…The software of TurboGrid is used to mesh the computational domain of impeller and vane diffuser, and the boundary layer are locally encrypted. 19,20 Finally, the grid number of the MCP is determined to be about 4.0 million, which was shown in Figure 5. In the CFD settings, the SST k-ω turbulence model is selected, [21][22][23] the interface between the inlet section and the impeller, the impeller and the diffuser are set to the dynamic and static coupling surface, the inlet and outlet boundary conditions are set to full pressure inlet (100 kPa) and the mass flow outlet respectively, 24,25 and the properties of the LBE medium is set, and the RMS convergence accuracy is set to 10 À4 .…”

Section: Establishment Of Multi-objective Optimization Platformmentioning

confidence: 99%

Shutdown idling performance of the nuclear main coolant pump under station blackout accident: An optimization study

Zhao

Batlló

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Lead-cooled fast reactor (LFR) is an important reactor type of the Generation IV nuclear energy, and the main coolant pump (MCP) is the only and most critical power equipment in primary circuit of LFR. The shutdown idling performance of the MCP, is one of the most important safety indicators in the event of a station blackout accident. When the motor loses its power supply, the MCP needs to run under the inertia of the flywheel to ensure the coolant flow for a short time. This study mainly focuses on the idling mathematical model of the MCP under power failure accidents. In this study, taking the shutdown idling performance of the MCP as the optimization goal, the parametric optimization analysis of the impeller and diffuser structure of the MCP was carried out. Specifically, based on the platform ISIGHT, the software of CFturbo, TurboGrid, CFX, Matlab and FLOWMASTER are systematically integrated, the automated 3D modeling, automatic meshing and automatic CFD calculation of different hydraulic model of the MCP are realized. And the neural network mathematical model between the geometric parameters of MCP and the idling performance indicators is established. The study shows that there is a strong linear relationship between the idling performance of the MCP and its head and shaft power, and meridian parameters of Δβ 2, Z 1, Φ 1h and the radial surface parameters of Δβ 1 and Δβ 2, Z 1 and Φ 1h have the greatest impact on the idling performance of MCP.

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“…The results showed that for the NC modes and the 1 ND modes, the natural frequency of the impeller decreases after considering the rotating shaft, while the rotating shaft constraint has little effect on the 2ND, 3ND, and 4ND modes. Cao [6] et al calculated the influence of different blade angles on the wet mode of the impeller by acoustic fluid-structure interaction method, and the results showed that a smaller blade angle would make the added mass effect more obvious and the natural frequency of the impeller lower. Yang [7] et al studied the effects of the fluid domain around the impeller and impeller diameter-to-height ratio on the wet mode of the impeller.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the added mass effect of centrifugal impellers with splitter blades

Xie

Dai

2023

Third International Conference on Mechanical Design and Simulation (MDS 2023)

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During the operation of the centrifugal pump, the impeller is easily resonated by multi-frequency fluid excitation, so it is necessary to perform modal analysis on the impeller to ensure the safe operation of the unit. In this paper, taking a certain type of centrifugal pump impeller as the research object, the dry and wet modal characteristics of the impeller are studied by acoustic fluid-structure interaction method, and the effects of the number of splitter blades and circumferential position of the splitter blades in the duplicated sector on the natural frequency are analyzed. The results show that the natural frequency of the impeller decreases significantly compared with the natural frequency in air due to the added mass effect of the fluid. Adding splitter blades between the main blades of the impeller will reduce the natural frequency of the impeller in air and water, and the frequency drop rate and added mass coefficient will decrease; the position of the splitter blades in the circumferential direction of the impeller has little effect on the natural frequency of the impeller.

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Influence of rotation on the modal characteristics of a bulb turbine unit rotor

Cited by 18 publications

References 27 publications

Effect of Operating Head on Dynamic Behavior of a Pump–Turbine Runner in Turbine Mode

Effect of Operating Head on Dynamic Behavior of a Pump–Turbine Runner in Turbine Mode

Shutdown idling performance of the nuclear main coolant pump under station blackout accident: An optimization study

Investigation on the added mass effect of centrifugal impellers with splitter blades

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