Investigation of the vortex evolution and hydraulic excitation in a pump-turbine operating at different conditions

Yu, An; Wang, Yongshuai; Tang, Qinghong; Lv, Ruirui; Yang, Zhongpo

doi:10.1016/j.renene.2021.02.131

Cited by 25 publications

(9 citation statements)

References 17 publications

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“…Some scholars have found that the pressure pulsation in the vaneless zone of hydraulic turbines has the greatest impact on their operation [7]. The low-frequency pressure pulsation caused by draft tube vortex belt cannot be ignored [8]. The pressure pulsation in the sealing ring is also of concern [9].…”

Section: Introductionmentioning

confidence: 99%

Pressure pulsation test of Wanjiazhai Francis turbine at different loads

Li,

Liu,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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In this paper, the pressure pulsation of Wanjiazhai Francis turbine at six monitoring points under different loads is monitored. Fast Fourier Transform(FFT) was used to perform time-frequency conversion, and the data was analyzed from both time-domain and frequency-domain perspectives. From a time perspective, the pressure pulsation at the upstream bladeless area is the most sensitive to changes in power. From a frequency perspective, the frequency components of pressure pulsation are more complex when P=40kW, while the frequency domain diagrams of pressure pulsation at each monitoring point are similar when P=80kW and P=120kW.

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Section: Introductionmentioning

confidence: 99%

Pressure pulsation test of Wanjiazhai Francis turbine at different loads

Li,

Liu,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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“…This leads to the poor hydraulic stability of the unit, and it is easier to produce complex flow phenomena such as eddy current, reflux, and rotating stall. 2,[11][12][13] These flow fields will cause vibration and noise, affecting the safe and stable operation of pump turbines. 9,[14][15][16] And vortices have a greater influence on the unit operation than other unsteady flow phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…Zeng et al 19 carried out a numerical simulation on the pump-turbine, and the results showed that the flow field vortex was mainly the passage vortex and the separation vortex under the runaway condition. An et al 11 studied the vortex inside the draft tube based on the FBM turbulence model. This study reveals the evolution mechanism of vortex rope in the draft tube.…”

Section: Introductionmentioning

confidence: 99%

Vortex structure and pressure fluctuation of a pump-turbine in pump mode using large Eddy simulation

Zhang

Jiang

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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Pump-turbines are usually used to ensure the stability of power system frequency and make up for the shortcomings of the intermittent nature of new energy such as wind energy. They are an important part of modern power systems. The Large Eddy Simulation (LES) method is used to study the vortex characteristics and pressure fluctuation intensity of the model pump-turbine working in pump mode. Results show that the wake vortex of the impeller has a great influence on the internal flow field of the pump-turbine, which is developed from the vortex structure near the suction surface of the blade. The distribution of trailing edge shedding vortex of guide vanes and shock vortex around tongue is closely related to the wake vortex of impeller. The wake vortex is divided into α and β according to the distribution range along the blade height. Their motion law and dissipation rate are different, and the influence of the α vortex on the flow field is greater. The distribution of pressure fluctuation intensity near the wall corresponds to the vortex structure, which indicated that the vortex is an important factor in pressure fluctuation. It is of great significance to improve the vortex structure inside the pump-turbine for safe and stable operation. The research in this paper can provide reference for the stable operation of the pump-turbine.

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“…Chen et al [7] performed numerical simulations on a Francis turbine without guide vane adjustments to obtain the distribution of internal pressure pulsation and flow characteristics within the turbine unit. Yu et al [8] conducted numerical simulations on a pump-turbine under different non-design operating conditions and studied the correlation between draft tube vortex evolution and low-frequency pressure pulsation. The study indicated that the frequency of pressure pulsation during cavitation is influenced by the evolution of cavitation volume.…”

Section: Introductionmentioning

confidence: 99%

Research on the Hydraulic Excitation Characteristics of the Top Cover Caused by the Radial Installation Deviation of the Seal of a 1GW Francis Turbine

Jin,

Lu,

Lin

et al. 2023

Processes

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The radial installation deviation of the turbine runner will change the gap flow between the upper crown and the lower ring seal, which will affect the radial force of the runner and the hydraulic excitation characteristics of the top cover. This research focuses on the 1GW Francis turbine on the right bank of the Baihetan hydropower station. The pressure distribution along the circumference of the top cover was analyzed, and the effects of deviations on the specific generation of hydraulic excitation forces were studied. This research shows that the increase in radial deviation will slightly reduce the output and efficiency, and the radial force on the runner increases parabolically. When the radial deviation is 1.5 mm, the radial force is 5.9 times higher compared to the case without any deviation, and the radius of the fitting circle of the radial force behavior trajectory increases with the increase in radial deviation. In addition, the radial deviation has little effect on the internal flow of the runner and the pressure distribution in the upper crown chamber. The dominant frequency components at the upstream monitoring points include fn, 15 fn, 24 fn, and 30 fn. The dominant frequency components at the downstream monitoring points include the blade passing frequencies of 15 fn and 30 fn. However, with the increase in radial deviation, the fluctuation amplitudes exhibit an asymmetric distribution, the uniformity of the pressure distribution in the circumferential direction of the labyrinth seal area becomes significantly worse, and the waveform of the downstream monitoring points changes significantly and presents a non-uniform distribution in one rotation cycle.

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Investigation of the vortex evolution and hydraulic excitation in a pump-turbine operating at different conditions

Cited by 25 publications

References 17 publications

Pressure pulsation test of Wanjiazhai Francis turbine at different loads

Pressure pulsation test of Wanjiazhai Francis turbine at different loads

Vortex structure and pressure fluctuation of a pump-turbine in pump mode using large Eddy simulation

Research on the Hydraulic Excitation Characteristics of the Top Cover Caused by the Radial Installation Deviation of the Seal of a 1GW Francis Turbine

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