Research on Energy Loss Characteristics of Pump-Turbine during Abnormal Shutdown

Deng, Yuxuan; Xu, Jing; Li, Yanna; Kuang, Chunyan

doi:10.3390/pr10081628

Cited by 5 publications

(3 citation statements)

References 27 publications

(27 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Authors in (Lain and Mejia, 2022) claim that physical modelling have gradually been replaced by CFD modelling techniques which are used to study hydro-kinetic along with hydro-dynamic studies. With the increasing popularity of PSH as energy storage elements and a good ancillary service provider for electric grid, CFD simulation of model turbine as a pump has been performed in (Deng et al, 2022) to quantify energy loss and entropy generation. Furthermore, studies about change in guide vane air foil on the flow characteristics of draft tube for improvement of energy recovery, vibrations intensity, stable operation of turbine, design methods of multiphase pumps for hydrodynamic and structural points of view, etc.…”

Section: 2mentioning

confidence: 99%

Models for a hydropower plant: a review

Nepal,

Bista,

Øyvang

et al. 2023

Linköping Electronic Conference Proceedings

View full text Add to dashboard Cite

Hydro Power plant (HPP), being one of the most convenient options for power generation, has been modelled considering very wide aspects of their application. A model is simply a mathematical representation of a system and it may serve different purposes like dynamic simulation of hydro power, energy systems modelling involving policy making, condition monitoring, etc. The purpose of modelling HPPs may lead to various kind of models for a single Hydropower. This paper aims at reviewing hydropower models developed using different methods along with the purpose for modelling them. This will provide brief insights about state of the art on hydropower modelling and its emerging techniques. Furthermore, this paper presents in more detail about tracking the advancements in dynamic models for classical and variable speed hydropower plants highlighting the need for the development of more accurate models. The work mainly involves narrative review of published works on hydro power modelling techniques. Also, it includes systematic reviews about dynamic representation of hydropower plants. As this paper aims at presentation of hydro power models in a classified manner based on purpose of modelling, the areas of improvement in each type of model have been discussed. Models for control can be made to be more accurate by including more realistic featured like penstock dynamics, uncertainties, etc which further help in design of advanced control systems. There are several potential benefits of HPP modelling, such as optimizing plant performance, improving control, reducing maintenance costs, and enhancing overall system efficiency and reliability.

show abstract

Section: 2mentioning

confidence: 99%

Models for a hydropower plant: a review

Nepal,

Bista,

Øyvang

et al. 2023

Linköping Electronic Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…However, the lack of a method to analyze the flow pattern of the FFP under the shutdown transition makes it difficult. It is worth noting that the structure of the FFP is similar to those of the other hydraulic machines [12,13], such as the AFPs [14,15], the turbines [16][17][18], and the centrifugal pumps [19][20][21][22][23][24]. The performance of these hydraulic machines during shutdown transition has been studied extensively.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Shutdown Transitions of the Full-Flow Pump and Axial-Flow Pump

Jiao,

Shan,

Yang

et al. 2023

JMSE

View full text Add to dashboard Cite

In this study, a comparative analysis of the shutdown transitions of a full-flow pump and an axial-flow pump was carried out through numerical simulation and model tests. The UDF method was used to achieve control of the impeller rotational speed during shutdown. The results show that during the shutdown transition, the rate of decline of rotational speed, flow rate, and torque of the axial-flow pump are greater than those of the full-flow pump, so the axial-flow pump stops faster than the full-flow pump. The axial force of the axial-flow pump is significantly lower than that of the full-flow pump, and the maximum value of the radial force of the axial-flow pump is approximately 1.14 times that of the full-flow pump. Due to the influence of the clearance backflow vortex, the impeller inlet and outlet of the full-flow pump generate clearance backflow vortices in the near-wall area, resulting in the overall flow pattern of the impeller chamber being worse than that of the axial-flow pump and the hydraulic loss being greater than that of the axial-flow pump. The runaway speed and flow rate of the axial-flow pump are higher than those of the full-flow pump. Due to the influence of the clearance backflow, the range of the high entropy production rate at the suction side of the impeller of the full-flow pump is always larger than that of the axial-flow pump. The research results in this paper can provide theoretical support for the selection and operation of pumps in large low-head pumping stations.

show abstract

“…The results showed that the energy loss was mainly concentrated in the impeller wake and the bladeless space. Deng et al 19 investigated the energy loss characteristics during the abnormal shutdown of a T-type pumping storage station. The results showed that the entropy production and vortex volume originated from the transition of the guide vane through the leafless space to the runner.…”

Section: Introductionmentioning

confidence: 99%

Optimization of low-head shaft tubular pumping systems based on entropy production theory

Wang,

Jiao,

Cheng

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

In order to improve the operation efficiency of low-head tubular pump, this paper studies the influence of shaft type in the shaft tubular pump on the flow characteristics and energy characteristics of the pump. To optimize the shaft structure of shaft tubular pumping systems and realize the efficient use of energy, numerical simulation and model test was employed to study the optimization of the entire pumping system. In this paper, the CFD method was used to numerically simulate the whole pumping system, and the effect of changing the shaft length, shaft head profile, and shaft tail profile on the internal flow and entropy production characteristics of the inlet passage and impeller position were analyzed. It is found that the tapered tail profile can make the inlet passage overflow area change more smoothly and thus make the flow pattern more favorable. The wall entropy production dissipation at the inlet passage position dominates the total entropy production, and the high-value area of mainstream entropy production at this position is distributed periodically. The mainstream entropy production dissipation at the impeller section accounts for a relatively large proportion. After the entropy production dissipation analysis, it is believed that the tapered can reduce the entropy production dissipation of the pumping systems. The change of the shaft tail profile will make the entropy production dissipation change more noticeable compared with other optimization factors. Therefore, the tapered tail profile with better transition in the actual project is recommended.

show abstract

Research on Energy Loss Characteristics of Pump-Turbine during Abnormal Shutdown

Cited by 5 publications

References 27 publications

Models for a hydropower plant: a review

Models for a hydropower plant: a review

Comparison of the Shutdown Transitions of the Full-Flow Pump and Axial-Flow Pump

Optimization of low-head shaft tubular pumping systems based on entropy production theory

Contact Info

Product

Resources

About