Characteristics and factors of mode families of axial turbine runner

Xia, Xiang; Luo, Haiqiang; Li, Shugang; Wang, Fei; Zhou, Lingjiu; Wang, Zhengwei

doi:10.1016/j.ijmecsci.2023.108356

Cited by 10 publications

(2 citation statements)

References 52 publications

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“…By combining Eqs. ( 2), ( 3) and ( 4), the complete sound-structure coupling equation can be obtained by combining the equations as follows [31]:…”

Section: Equation Of Acoustic-solid Coupling Femmentioning

confidence: 99%

Vibro-Acoustic Analysis of an Underwater Cylindrical Shell with Internal Structures and a Comparison with Experiment

Chen,

Li,

Chen

2023

J. Mod. Mech. Eng. Technol.

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In this work, the low-frequency vibration response and full-band acoustic radiation characteristics of an underwater reinforced cylindrical shell with internal structures are studied by combining the FEM with SEA. The stiffened cylindrical shell contains internal structures such as the F-shape plates and the support valve frames. The exciting sources have two different exciting forces corresponding to two experimental conditions. In the low-frequency band, the FEM was employed, and in the medium and high-frequency bands, the SEA was used. A comparison of the numerical results and the experiment shows that they agree well. The FEM and SEA give better results at [1,1k] Hz and [1k,10k] Hz, respectively. Due to mesh quality limitations, the FEM is not favorable for medium and high-frequency calculations. The SEA focuses on the structural mean power flow but cannot obtain position-specific vibrational responses. The results show that the internal excitation source mainly causes the structural vibration and sound radiation and are closely related to the free vibration characteristics of the structure. In addition, with the increase in frequency, the circumferential sound pressure level of the underwater structure has more substantial directivity.

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“…By combining Eqs. ( 2), ( 3) and ( 4), the complete sound-structure coupling equation can be obtained by combining the equations as follows [31]:…”

Section: Equation Of Acoustic-solid Coupling Femmentioning

confidence: 99%

Vibro-Acoustic Analysis of an Underwater Cylindrical Shell with Internal Structures and a Comparison with Experiment

Chen,

Li,

Chen

2023

J. Mod. Mech. Eng. Technol.

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“…Kaplan turbine is a type of hydraulic power generation machinery widely used in large‐flow and low‐head hydropower stations 1 . Due to the cantilever structure of the blade of the Kaplan turbine runner, there must be a clearance between the top of the blade and the casing 2 . The fluid near the blade tip clearance is affected by the pressure difference between the blade pressure surface and the suction surface, which flows from the pressure surface to the suction surface through the blade tip clearance, forming a clearance leakage flow 3 .…”

Section: Introductionmentioning

confidence: 99%

Prediction of runner eccentricity and Alford force of a Kaplan turbine based on variational mode decomposition

Hu,

Liu,

Wang

et al. 2024

Energy Science & Engineering

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The rotor blades of an axial‐flow turbine are cantilever structures, and there is inevitably a gap between them and the casing. Due to factors such as rotor wear and unit vibration, the eccentricity of the impeller will change during the operation of the turbine, resulting in the impeller being affected by additional radial forces, which can even lead to rubbing or biting between the impeller and the casing. To monitor the eccentricity of the impeller and the additional radial forces in real time during the operation of the turbine, this study conducted numerical simulations of the internal flow of the turbine under different eccentricities of the impeller, and analyzed the characteristics of pressure pulsation and impeller radial force in the turbine using the variational mode decomposition method. The results showed that there was a good linear relationship between the eccentricity of the impeller and the amplitude of the frequency corresponding to the rotor in pressure pulsation at the monitoring point and the Alford force acting on the impeller. Based on this finding, we established mathematical formulas for the relationship between the pressure pulsation at the monitoring point and the eccentricity of the impeller, as well as the eccentricity of the impeller and the Alford force acting on it. According to these formulas, we only need to monitor the pressure pulsation during the operation of the turbine to realize the real‐time monitoring of the eccentricity of the impeller and the Alford force, which is of great significance for ensuring the safe and stable operation of the turbine.

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Method of non-stationary random vibration reliability of hydro-turbine generator unit

Li,

Liu,

Cai

et al. 2024

Acta Mech. Sin.

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Characteristics and factors of mode families of axial turbine runner

Cited by 10 publications

References 52 publications

Vibro-Acoustic Analysis of an Underwater Cylindrical Shell with Internal Structures and a Comparison with Experiment

Vibro-Acoustic Analysis of an Underwater Cylindrical Shell with Internal Structures and a Comparison with Experiment

Prediction of runner eccentricity and Alford force of a Kaplan turbine based on variational mode decomposition

Method of non-stationary random vibration reliability of hydro-turbine generator unit

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