Study on the method of reducing the pressure fluctuation of hydraulic turbine by optimizing the draft tube pressure distribution

Su, Wen-Tao; Binama, Maxime; Yang, Lijun; Zhao, Yue

doi:10.1016/j.renene.2020.08.057

Cited by 23 publications

(9 citation statements)

References 54 publications

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“…The most commonly used ones are the installation of fi ns in the diff user of the draft tube [23] and grilles at the outlet of the runner [24], injection of an air jet [25,26], and changing the geometric charac te ristics of the runner blade system [27,28]. Among the latter, the method of lengthening the cone of the runner is widely used [29,30]. The presence of splitters in the runner can also aff ect the level of pulsations in both turbine and pump modes [31].…”

Section: Conclusion the Determined Infl Uence Of Spatial Shape Of The...mentioning

confidence: 99%

Experimental Studies of Pressure Pulsations in Draft Tube Diffuser of Pump-Turbine Models for Heads up to 200 m

RUSANOV,

SUBOTIN,

KHORYEV

et al. 2024

Sci. innov.

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Introduction. Increasing the share of balancing capacities to cover daily peaks in electricity consumption is one of the top priorities of the postwar development of Ukraine’s energy sector.Problem Statement. Today, power plant hydraulic turbines need both to increase effi ciency and to expand their operating range. For example, the new hydraulic units of the Dniester PSP shall operate in turbine mode in the range of 40—100% of rated capacity, while the four previous units operate in the range of 70—100%. This requirement can be met by increasing efficiency and reducing pulsations at low power output.Purpose. Based on studying the infl uence of blade spatial shape of a Francis pump-turbine runners on fl ow parthydrodynamics, to identify the patterns of pressure fluctuations distribution in draft tube diff user of the hydraulic unit model.Materials and Methods. Three options of models (the original and two modifi ed ones) have been studied onthe IMEP ECS-30 hydrodynamic test stand. The runner blades are made of PLA plastic by 3D printing. Pressurepulsations are measured by sensors at two points of draft tube diff user at a distance of 0.2 and 1.5 runner diameters from the runner bottom shroud.Results. Three modifi cations of the pump-turbine runner for heads up to 200 m have been designed and experimentally studied with the use of circumferential lean that diff er from the original version only in relative position of blade profiles. The analysis of obtained energy and pulsation characteristics of the models in turbine modehas shown that the model with the runner having a negative circular blade lean has the best performance. Conclusions. The determined influence of spatial shape of the runner blades on the energy and pulsation characteristics of the Francis pump-turbine model for heads up to 200 m has made it possible to increase its efficiency and to reduce the level of pressure fluctuations in the flow part.

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Section: Conclusion the Determined Infl Uence Of Spatial Shape Of The...mentioning

confidence: 99%

Experimental Studies of Pressure Pulsations in Draft Tube Diffuser of Pump-Turbine Models for Heads up to 200 m

RUSANOV,

SUBOTIN,

KHORYEV

et al. 2024

Sci. innov.

View full text Add to dashboard Cite

show abstract

“…The computations are carried out by RANS turbulence modeling combined with the kx-SST turbulence model. The kx-SST turbulence model is believed to improve the predictive capability for complex turbulent flows with flow swirling and separation, and it is also claimed to offer the best tradeoff between accuracy and computational demands for the parameters considered [35][36][37][38]. Therefore, the kx-SST turbulence model is employed and the following equations according to Ref.…”

Section: Continuity Equationmentioning

confidence: 99%

A high temperature turbine blade heat transfer multilevel design platform

Wang

Luo

et al. 2020

Numerical Heat Transfer, Part A: Applications

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In this work, a fast and efficiently design method has been introduced. This design process consists of the overall design and the detailed design. For the overall design, one-dimensional pipe-network computations are employed to obtain several design cases quickly at the beginning. Meanwhile the solid domain geometry and mesh with cooling structures, i.e., film holes, impingement holes, and ribs have been generated to carry out three-dimensional (3-D) heat conduction calculations. Based on the above, a detailed design has been performed by 3-D conjugate heat transfer calculations. The results show that both the average temperature and the mass flow maximum errors between the pipe-network and 3-D conjugate heat transfer calculations are about 10%. In this article, the cooling structure of a gas turbine blade is designed with this platform. The final design results show that the maximum dimensionless temperature on the blade surface is 0.813, i.e., lower than the design requirement. The dimensionless mass flow rate in the first cooling inlet is 0.0168, and the mass flow rate in the secondary inlet is 0.0231.

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“…It can be seen from the above researches that their experiments were mainly performed on the model hydraulic turbine in laboratory. The main reason for the phenomenon is the difficulties in directly monitoring the pressure pulsation characteristics of flow excitation on-line in the hydropower station [11]. However, compared with the results obtained by direct on-line monitoring of the flow excitation in the hydropower station, the results obtained by the experiment based on model hydraulic turbine are not sufficiently good [12].…”

Section: Introductionmentioning

confidence: 98%

An on-line monitoring method for the flow excitation in francis hydraulic turbine based on dynamics

Li¹,

Zhang²,

Liu³

et al. 2022

J. vibroeng.

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During the operation of hydraulic turbine, the vibration often exceeds the standard due to flow excitation, which affects the safe and stable operation of the hydraulic turbine. In this paper, an on-line monitoring method for the flow excitation in Francis hydraulic turbine is proposed based on the dynamic characteristics of Francis hydraulic turbine. Firstly, based on the flow excitation characteristics in Francis hydraulic turbine and the dynamic equation of main shaft system, the internal relationships between the dynamic response of turbine bearing and the flow excitation in the Francis hydraulic turbine are clarified. Secondly, according to these relationships, a method based on wavelet transform (WT), particle swarm optimization (PSO), and variational mode decomposition (VMD) is proposed for extracting the flow excitation features in Francis hydraulic turbine. Then, by this method, the flow excitation features are acquired. Based on the obtained flow excitation features, the flow excitation can be monitored on-line. Finally, the proposed on-line monitoring method for the flow excitation in Francis hydraulic turbine is verified by experiments. Based on the results, the flow excitation components in the signal extracted by this method are about 35 % more than those extracted by the previous methods. The results show that the on-line monitoring method proposed in this paper is convenient and effective.

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Study on the method of reducing the pressure fluctuation of hydraulic turbine by optimizing the draft tube pressure distribution

Cited by 23 publications

References 54 publications

Experimental Studies of Pressure Pulsations in Draft Tube Diffuser of Pump-Turbine Models for Heads up to 200 m

Experimental Studies of Pressure Pulsations in Draft Tube Diffuser of Pump-Turbine Models for Heads up to 200 m

A high temperature turbine blade heat transfer multilevel design platform

An on-line monitoring method for the flow excitation in francis hydraulic turbine based on dynamics

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