Evaluation of the rotor eccentricity added radial force of oscillating water column

Tao, Ran; Jin, Faye; Hu, Zilong; Zhu, Di; Luo, Yongyao

doi:10.1016/j.oceaneng.2023.114222

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…Most clean energy is process energy, which involves real-time energy conversion, transportation, and storage [1,2]. In ocean energy utilization, hydro energy utilization, or pumped storage technology, energy conversion and utilization require a series of electromechanical devices, and turbomachinery represents one of the most common types [3][4][5]. The use of turbomachinery involves the control of fluids, and a series of special phenomena caused by complex flows can also occur.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of the Mode-Decomposed Characteristics of the Asymmetricity of a Vortex Rope with Flow Rate Variation

Li,

Guang,

Yang

et al. 2024

Symmetry

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In hydro turbines, the draft tube vortex rope is one of the most crucial impact factors causing pressure pulsation and vibration. It is affected by operating conditions due to differences in the flow rate and state and can be symmetric or asymmetric along the rotational direction. It may influence the stability of draft tube flow. To achieve a better understanding, in this work, dynamic mode decomposition is used in a draft tube case study of a simplification of a vortex rope. As the flow rate increases, the shape of the vortex rope becomes clear, and the flow rotation becomes more significant as the inlet flow rate increases. Dynamic mode decomposition was used to determine the relative frequencies, which were 0 (averaged), 0.7 times, and 1.4 times the features of the reference frequency. As the inlet flow rate increases, the order of high-energy modes and their influence on the vortex rope gradually increase, and this characteristic is exhibited further downstream of the draft tube. When the inlet flow rate is low, the impact of mode noise is greater. As the flow velocity increases, the noise weakens and the rotation mode becomes more apparent. Identifying the mode of the vortex flow helps extract characteristics of the vortex rope flow under different operating conditions, providing a richer data-driven basis for an in-depth analysis of the impact of operating conditions on the flow stability of a draft tube.

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Section: Introductionmentioning

confidence: 99%

A Comparative Study of the Mode-Decomposed Characteristics of the Asymmetricity of a Vortex Rope with Flow Rate Variation

Li,

Guang,

Yang

et al. 2024

Symmetry

Self Cite

View full text Add to dashboard Cite

show abstract

“…In order to alleviate this dilemma and reduce the need for fossil energy, we have been looking for a new type of sustainable, renewable, and efficient energy. Studies have shown that with the development of renewable energy technology, the use of fossil energy as the main energy source has seen a huge decline in the past decade, and new renewable energy, such as hydro energy [1], wind energy [2], marine energy [3], and solar energy [4], has gradually occupied a dominant position in the energy structure. The carbon reduction of conventional energy-consuming machinery has also become a key research object [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Pressure Pulsation Characteristics of Francis Turbine with Different Draft Tube Arrangement Direction

Zhang,

Hu,

Liu

et al. 2023

Water

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Hydroelectric power generation is an important clean energy source, and the stability of water turbine operation determines the quality of hydro energy utilization. For hydro turbines, the layout direction of the draft tube is often only considered from a structural perspective, ignoring the hydrodynamic characteristics. This study adopts the computational fluid dynamics method and verifies the effectiveness of numerical simulation with experimental results, analyzing the influence of asymmetric draft tube layout direction on pressure pulsation of mixed flow turbine. The results show that under different working conditions, there is basically no difference in efficiency corresponding to different inclined directions of the draft tube, and the relative difference in performance values is less than 1%. From the perspective of internal flow, the working condition has a greater impact on the flow, and the draft tube tilt has a smaller impact. Under strong swirling flow conditions in the draft tube, the variational mode decomposition of pressure fluctuation is carried out. Research has found 7 characteristic frequency bands including 140 Hz, 80–90 Hz, 40–46 Hz, 5.5–6.5 Hz, 2.5–3 Hz, 1.67 Hz, and <1 Hz. The frequency of the dominant mode corresponding to the left tilt is higher, while the amplitude of the runner frequency is slightly lower. In general, left tilt is not only more suitable for unit layout but also has a better effect on draft tube pressure fluctuation, which is worthy of application in engineering.

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A self-powered and self-sensing wave energy harvester based on a three-rotor motor of axle disk type for sustainable sea

Xia,

Fan,

Zhou

et al. 2024

Energy

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Evaluation of the rotor eccentricity added radial force of oscillating water column

Cited by 4 publications

References 18 publications

A Comparative Study of the Mode-Decomposed Characteristics of the Asymmetricity of a Vortex Rope with Flow Rate Variation

A Comparative Study of the Mode-Decomposed Characteristics of the Asymmetricity of a Vortex Rope with Flow Rate Variation

Comparison of Pressure Pulsation Characteristics of Francis Turbine with Different Draft Tube Arrangement Direction

A self-powered and self-sensing wave energy harvester based on a three-rotor motor of axle disk type for sustainable sea

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