Analytical system for predicting cracks in hydraulic turbines

Georgievskaia, Evgeniia

doi:10.1016/j.engfailanal.2021.105489

Cited by 4 publications

(2 citation statements)

References 35 publications

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“…Increased roughness increases losses due to increased friction losses (typically between the head and the worn surface) and offset from the optimal hydraulic profile [61].…”

Section: Effect Of Factors On the Efficiency Of Hydraulic Turbines 21...mentioning

confidence: 99%

A Review of the Efficiency Improvement of Hydraulic Turbines in Energy Recovery

Song

Xue

et al. 2023

Processes

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Turbine energy recovery is a process energy saving technology, and understanding turbine efficiency has important operational and economic benefits for the operator of a power plant. There are three main areas of research into turbine energy efficiency: the structural performance of the turbine itself, the configuration of the recovery device and the regulation of operating conditions. This paper summarizes recent research advances in hydraulic turbine energy efficiency improvement, focusing on the design factors that can affect the overall efficiency of a hydraulic turbine. To quantify the impact of these factors, this paper investigates the effects of surface roughness, flow rate, head and impeller speed on overall efficiency. Methods for optimizing improvements based on these design factors are reviewed, and two methods, the Box–Behnken Design method and the NSGA-II genetic algorithm, are described with practical examples to provide ideas for future research.

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“…Increased roughness increases losses due to increased friction losses (typically between the head and the worn surface) and offset from the optimal hydraulic profile [61].…”

Section: Effect Of Factors On the Efficiency Of Hydraulic Turbines 21...mentioning

confidence: 99%

A Review of the Efficiency Improvement of Hydraulic Turbines in Energy Recovery

Song

Xue

et al. 2023

Processes

View full text Add to dashboard Cite

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“…This device converts the kinetic energy of running water into the rotary motion required to turn a generator, and then generates electricity. According to the published reports, cavitation [1][2][3], silt erosion [4][5][6][7], and fatigue [8][9][10][11] are the common reasons for damages to hydro turbines, specifically Kaplan turbines. Since the finding of the first type of hydro turbine (Francis) in 1848 [12], the erosion of hydraulic machines due to cavitation and solid particles has been challenging for engineers involved in the design, construction, operation, and maintenance of HPPs.…”

Section: Introductionmentioning

confidence: 99%

Common Failures in Hydraulic Kaplan Turbine Blades and Practical Solutions

2023

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Kaplan turbines, as one of the well-known hydraulic turbines, are generally utilized worldwide for low-head and high-flow conditions. Any failure in each of the turbine components can result in long-term downtime and high repair costs. In a particular case, if other parts are damaged due to the impact of the broken blades (e.g., the main shaft of the turbine), the whole power plant may be shut down. On the other hand, further research on the primary causes of failures in turbines can help improve the present failure evaluation methodologies in power plants. Hence, the main objective of this paper is to present the major causes of Kaplan turbine failures to prevent excessive damage to the equipment and provide practical solutions for them. In general, turbines are mainly subjected to both Internal Object Damage (IOD) and Foreign Object Damage (FOD). Accordingly, this paper presents a state-of-the-art review of Kaplan turbine failures related to material and physical defects, deficiencies in design, deficits in manufacturing and assembly processes, corrosion failures, fatigue failure, cavitation wear, types of cavitation in hydro turbines, hydro-abrasive problems, and hydro-erosion problems. Eventually, the authors have attempted to discuss practical hints (e.g., nanostructured coatings) to prevent damages and improve the performance of Kaplan turbines.

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