Hydraulic performance prediction of a prototype four-nozzle Pelton turbine by entire flow path simulation

Zeng, C J; Xiao, Yexiang; Luo, Yongyao; Zhang, Jin; Wang, Zhengwei; Fan, Honggang; Ahn, Soo-Hwang

doi:10.1016/j.renene.2018.02.075

Cited by 32 publications

(14 citation statements)

References 15 publications

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“…This is done to keep the designed water reservoir from being damaged or broken because of too much water. The results of research using the Pelton Turbine that can produce electricity by 10% -25% have also been carried out by Zeng et al, [22]. However, their research was carried out with simulations using different prototype four-nozzle Pelton turbines.…”

Section: Measuring Results Of Square and Round Nozzle Turbinementioning

confidence: 99%

Analysis the Performance for Runner Pelton Turbine by Using Bamboo Material

Muhibbuddin

Zaki

Kamal

et al. 2021

ARFMTS

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The potential of hydropower that can be utilized in Indonesia is quite abundant and cannot be utilized optimally until now. While the government has targeted the use of renewable energy in 2025 by 23% along with an emission reduction of 29% in 2030. This research is conducting experiments with the aim of analyzing the performance level of Turbine Pelton Runner rotation speed using bamboo material. The turbine design is made with two different models between square nozzle made of bamboo material and round nozzle made of copper. The results showed that bamboo material designed with a square nozzle to rotate the Turbine Pelton Runner can produce a higher speed of 794.4 rpm than a round copper nozzle of 663 rpm. Increased Turbine rotation will produce higher electric energy. The potential for water discharge at the time of testing was quite large so as to produce electric power reaching 150 kW. The square nozzle designed from bamboo material to rotate the Turbine Pelton Runner is the latest in this article. Overall Turbine rotation performance for all three tests showed a significant improvement.

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Section: Measuring Results Of Square and Round Nozzle Turbinementioning

confidence: 99%

Analysis the Performance for Runner Pelton Turbine by Using Bamboo Material

Muhibbuddin

Zaki

Kamal

et al. 2021

ARFMTS

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“…Dimensions can be optimized, and the thickness reduced by including in the casing inserts and shrouds, with the aim of making the casing lighter and to reduce the splashes and water jet interferences. The key studies that recommend how to design the internal shrouds and ribs are here discussed, but CFD simulations are recommended to further predict the hydraulic behavior of the casing, in order to overcome limitations of experimental measurements [ 71 ], especially for multi-nozzle turbines [ 72 ]. The additional complexity is that the casing is a component which may not be symmetric in general, and this requires the simulation of the full domain when the flow behavior inside the casing is of interest.…”

Section: Discussion Open Questions and Challengesmentioning

confidence: 99%

The state-of-art of design and research for Pelton turbine casing, weight estimation, counterpressure operation and scientific challenges

Quaranta¹,

Trivedi²

2021

Heliyon

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The Pelton turbine is the most widespread and efficient impulse hydropower turbine. The Pelton casing is a static, but key component: the internal hydrodynamic phenomena affect the performance of the hydropower plant, the vibration of the equipment and water quality (dissolved oxygen downstream). However, the literature information is very fragmented and not well organized, so that the design is generally based on empirical rules and on proper know-how of hydropower companies. In this paper, the state-of-the-art of the Pelton casing is reviewed and organized under three macro areas: hydraulics, mechanics (vibrations and weight) and aeration. The preliminary design procedure is described and discussed in light of recent scientific results, and the open questions and research challenges are highlighted. Innovative case studies are described (including counterpressure operation) and a dataset of installed casings (not available in literature) is elaborated to derive an empirical equation to estimate the casing weight. The efficiency can be improved by 3% by an optimal fluid dynamic design and a better understanding of the internal hydrodynamics. Proper inserts can improve the hydraulic efficiency by 2%, reduce the weight (by about 12%) and better bear the vibrations. Several scientific questions are still open, and a better understanding of the fluid structure interaction is needed to improve efficiency, operation and water quality.

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“…Although the inflow angle at the entrance of impeller has improved, these two methods undoubtedly increase the manufacturing cost of PAT. Zeng et al [16,17] proposed the concept of "Impulse Pump-as-Turbine (Impulse PAT)", where the centrifugal pump impeller is used as a hydro turbine by pairing with the spear valve injector from an impulse hydro turbine. The spear valve injector regulates water inlet flow rate and, thus, regulates power output of the new concept turbine.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Analysis of the Effect of Impeller Rounding on Centrifugal Pump as Turbine

et al. 2021

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Pump as turbine (PAT) is one of the micro-hydro system components. It can be used alone as a generator in remote areas without power supply, and in hydraulic networks instead of pressure-reducing valves. However, its hydraulic optimization still remains an open research problem. One of the optimization techniques is the rounding of the sharp edges at the blade periphery. Existing studies are mostly based on prototype experiments to obtain the optimization effect. In order to more intuitively analyze the influence of this structural optimization on the internal flow of PAT, this paper uses the CFD method to study the influence of the leading edge of the centrifugal pump blade and the fillet of the impeller on the turbine performance. By simulating the PAT performance at different flow rates and speeds, the internal hydraulic performance changes caused by the inverted circular blade are analyzed. Simulation results show that, under various operating conditions, the impeller inverted circle improves the efficiency of PAT to different degrees. At the speed of 1500 rpm, the efficiency is most obviously improved, which can reach 8.09%. Internal flow results show that the efficiency increases along with the decrease in impeller inlet resistance and the flow separation region in the impeller. This paper provides an effective method for studying the PAT hydraulic optimization problem.

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Hydraulic performance prediction of a prototype four-nozzle Pelton turbine by entire flow path simulation

Cited by 32 publications

References 15 publications

Analysis the Performance for Runner Pelton Turbine by Using Bamboo Material

Analysis the Performance for Runner Pelton Turbine by Using Bamboo Material

The state-of-art of design and research for Pelton turbine casing, weight estimation, counterpressure operation and scientific challenges

A Numerical Analysis of the Effect of Impeller Rounding on Centrifugal Pump as Turbine

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