Predicting the Inception Cavitation of a Reversible Pump- Turbine in Pump Mode

Tao, Ran; Xiao, Ruofu; Zhu, Daiyin; Liu, Weichao

doi:10.1088/1742-6596/656/1/012077

Cited by 4 publications

(2 citation statements)

References 7 publications

(7 reference statements)

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“…With the continuous deepening of research and innovation in methods, many scholars [23][24][25][26] have analyzed the internal flow and noticed that the formation of the hump zone and hysteresis phenomena is also correlated with the change in runner work and hydraulic loss. Under identical operating conditions, the hydraulic loss is different as a result of different discharge directions, different flow channel vortices and reflux states, and thus hysteresis effects.…”

Section: Introductionmentioning

confidence: 99%

The Splitter Blade Pump–Turbine in Pump Mode: The Hump Characteristic and Hysteresis Effect Flow Mechanism

Dong,

Luo,

Guo

et al. 2024

Processes

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This study focuses on the splitter blade pump–turbine as the research object to analyze the problems of hump characteristics and the hysteresis effect. We simulated the operation of the pump condition with small opening of the guide vane, analyzed the hydraulic loss by using the entropy production theory and entropy wall function, and investigated the study of internal flow transfer characteristics. In this paper, it was first verified that the maximum error of the energy loss calculated by the pressure method and the entropy production method was less than 6% for the working zone. From the quantified energy loss results, a significant instability feature was observed in the 0.65 QBEP–0.9 QBEP operating interval, accompanied by the phenomenon of the non-overlapping of the characteristic curves. The results show that the hump characteristic with hysteresis effect also exists in the splitter blade pump–turbine. The percentage of energy loss in the hump zone is in descending order of runner, guide vanes, spiral casing, and draft tube, but this changes again at low flow rates. By analyzing the high-entropy production region, it was found that the high-hydraulic-loss region is mainly distributed at the trailing edge of the long blade in the vane-less space, which is different from the traditional runner.

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Section: Introductionmentioning

confidence: 99%

The Splitter Blade Pump–Turbine in Pump Mode: The Hump Characteristic and Hysteresis Effect Flow Mechanism

Dong,

Luo,

Guo

et al. 2024

Processes

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show abstract

“…Therefore, it is very important to investigate and improve the LE cavitation (including delaying its occurrence, reducing its size, etc.) for the design of hydraulic machinery [7][8][9]. Compared with the design of the flow passage, the blade will exert a direct force on the fluid medium while working and generate a pressure difference between the two sides of blade surface [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Designing Incidence-Angle-Targeted Anti-Cavitation Foil Profiles Using a Combination Optimization Strategy

et al. 2018

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In hydraulic machinery, the surface of the blade can get damaged by the cavitation of the leading-edge. In order to improve the cavitation performance, the anti-cavitation optimization design of blade leading-edge is conducted. A heuristic-parallel locally-terminated improved hill-climbing algorithm, which is named as the global dynamic-criterion (GDC) algorithm was proposed in this study. The leading-edge shape of NACA 0009-mod foil profile was optimized by combining the GDC algorithm, CFD prediction, Diffusion-angle Integral (DI) design method and orthogonal test. Three different optimal foil geometries were obtained for specific incidence angles that 0, 3, and 6 degrees. According to the flow field analyses, it was found that the geometric variation of the optimized foil fits the incoming flow better at the respective optimal incidence angles due to a slighter leading-edge flow separation. The pressure drops become gentler so that the cavitation performance get improved. Results show that the GDC algorithm quickly and successfully fits the target condition by parallel running with the ability against falling into local-best tarps. The −C pmin of the optimal foils was improved especially by +11.4% and +14.5% at 3 and 6 degrees comparing with the original foil. This study provided a reference for the anti-cavitation design of hydraulic machinery blades.

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Cavitation mechanism and effect on pump power-trip transient process of a pumped-storage unit

Wang

et al. 2023

Journal of Energy Storage

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Predicting the Inception Cavitation of a Reversible Pump- Turbine in Pump Mode

Cited by 4 publications

References 7 publications

The Splitter Blade Pump–Turbine in Pump Mode: The Hump Characteristic and Hysteresis Effect Flow Mechanism

The Splitter Blade Pump–Turbine in Pump Mode: The Hump Characteristic and Hysteresis Effect Flow Mechanism

Designing Incidence-Angle-Targeted Anti-Cavitation Foil Profiles Using a Combination Optimization Strategy

Cavitation mechanism and effect on pump power-trip transient process of a pumped-storage unit

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