A Brief History of the Kaplan Turbine Invention

Polák, Martin

doi:10.3390/en14196211

Cited by 11 publications

(9 citation statements)

References 2 publications

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“…The form of turbine has axial flow, mixed flow impact, etc [1]. As a kind of counter turbine, the Francis turbine has the characteristics of large range of head, small structure size, easy installation and high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Analysis of energy dissipation in allowable, restricted and prohibited operating areas of wanjiazhai francis turbine

He,

Pan,

et al. 2024

J. Phys.: Conf. Ser.

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With the “14th Five-Year Plan” and the “two-carbon” policy, the application of renewable energy has seen a substantial increase. As a kind of hydraulic machinery which converts the kinetic energy of water into electric energy, the turbine is widely used in various hydropower stations. However, due to the variability of flow rate, speed and head, how to ensure the efficiency of unit operation is particularly important in complicated working conditions. In this study, the Francis turbine of Wanjiazhai Hydropower Station is taken as the research object. Through the combination of numerical simulation and experiment, the energy consumption under the permitted, restricted and forbidden conditions is analyzed.

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Section: Introductionmentioning

confidence: 99%

Analysis of energy dissipation in allowable, restricted and prohibited operating areas of wanjiazhai francis turbine

He,

Pan,

et al. 2024

J. Phys.: Conf. Ser.

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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.…”

Section: Introductionmentioning

confidence: 99%

“…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 .…”

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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“…The axial flow turbine is generally suitable for hydropower stations with a low head and large flow rate [1]. It offers the advantages of high speed and efficiency under the condition of large flow rate variation [2]. At present, the axial flow turbine is one of the main types used for the development and utilization of hydropower resources in low-head sections.…”

Section: Introductionmentioning

confidence: 99%

Inner Flow Analysis of Kaplan Turbine under Off-Cam Conditions

Yan,

Luo,

Zhao

et al. 2024

Energies

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Kaplan turbines are widely utilized in low-head and large flow power stations. This paper employs Computational Fluid Dynamics (CFD) to complete numerical calculations of the full flow channel under different blade angles and various guide vane openings, based on 25 off-cam experimental working conditions. The internal flow characteristics of the runner blade and draft tube are analyzed, and a discriminant number for quantitatively assessing the flow uniformity of the draft tube is proposed. The results indicate that low-frequency and high-amplitude pressure pulsations occur on the high- and low-pressure edge of the blade when the opening is small, with pulsations decreasing as the opening increases. The inner flow line of the draft tube is disturbed when both the blade angle and opening are small. Additionally, the secondary frequency of the draft tube inlet is double that of the vane passing frequency. The discriminant number of the flow inhomogeneity approaches 0 under optimal flow conditions. The number increases continuously with the decrease in efficiency, and the flow in the three piers of draft tube becomes more nonuniform. The research results provide a reference for enhancing performance and ensuring the operational stability of Kaplan turbines.

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A Brief History of the Kaplan Turbine Invention

Cited by 11 publications

References 2 publications

Analysis of energy dissipation in allowable, restricted and prohibited operating areas of wanjiazhai francis turbine

Analysis of energy dissipation in allowable, restricted and prohibited operating areas of wanjiazhai francis turbine

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

Inner Flow Analysis of Kaplan Turbine under Off-Cam Conditions

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