The dynamic characteristics of the ultimate strength of a turbine runner blade under hydraulic excitation

Li, Zhaojun; Wang, Yujiang; Li, Tinghao; Liu, Fuxiu; Ji, Jianhua

doi:10.1080/15567036.2019.1586014

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…The cracks in the turbine runner blades have always been an essential factor affecting hydropower stations' stable and safe operation. Dynamic stress caused by resonance is often one of the leading causes of cracks in turbine runner blades [36]. Repairing cracks can reduce damage to a certain extent, but frequent shutdown and welding will reduce the ultimate strength of the runner and cause economic losses.…”

Section: Cracks In the Blades Of Turbine Runnermentioning

confidence: 99%

Acoustic Vibration Approach for Detecting Faults in Hydroelectric Units: A Review

et al. 2021

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The health of the hydroelectric generator determines the safe, stable, and reliable operation of the hydropower station. In order to keep the hydroelectric generator in a better state of health and avoid accidents, it is crucial to detect its faults. In recent years, fault detection methods based on sound and vibration signals have gradually become research hotspots due to their high sensitivity, achievable continuous dynamic monitoring, and easy adaptation to complex environments. Therefore, this paper is a supplement to the existing state monitoring and fault diagnosis system of the hydroelectric generator; it divides the hydroelectric generator into two significant parts: hydro-generator and hydro-turbine, and summarizes the research and application of fault detect technology based on sound signal vibration in hydroelectric generator and introduces some new technology developments in recent years, and puts forward the existing problems in the current research and future development directions, and it is expected to provides some reference for the research on fault diagnosis of the hydroelectric generator.

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Section: Cracks In the Blades Of Turbine Runnermentioning

confidence: 99%

Acoustic Vibration Approach for Detecting Faults in Hydroelectric Units: A Review

et al. 2021

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“…4 The self-excited vibration of runner is a common problem of hydraulic turbine and even all turbomachinery. 5,6 As a rotating part, there must be a clearance between the runner and the runner chamber or casing. The geometric scale of clearance flow is special.…”

Section: Introductionmentioning

confidence: 99%

Influence of runner eccentricity on the hydraulic performance of tubular turbine: A comparative case study

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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The self-excited vibration of runner is an important factor affecting the stable operation of hydro-turbines. Due to the particularity of structure, there is always a gap between the runner and the shell of the tubular turbine, and the eccentricity of the runner often occurs due to manufacturing or installation. The uneven clearance caused by runner eccentricity will lead to Alford effect and may induce the self-excited vibration. Based on a model tubular turbine, the Alford effect and Alford force of different runner eccentricity is deeply explored through the combination of experiment and numerical simulation. Based on the investigation under a common high-efficiency condition, it is found that the difference of runner eccentricity will cause obvious changes in performance. With the increase of runner eccentricity, the average value of runner radial force increases gradually. The overall frequency of radial force shows several frequency bands and the frequency may shift with the increase of eccentricity level. The runner eccentricity causes obvious changes of internal flow and tip leakage vortex in the blade tip clearances. In the narrowest clearance due to eccentricity, the turbulence kinetic energy and vortex intensity obviously rise up. The pressure in the clearances with different widths are also different. The influence of flow field inside clearance will be the main reason of Alford effect. This study is meaningful for tubular turbines for the operation stability and security.

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“…Zhang [3] conducted a comparative study of strong and weak coupling in fluid-structure coupling. Especially in the field of hydraulic machinery, there are countless applications of the convective fluid-structure coupling method, such as mixed-flow pumps [4][5][6][7], pump turbines [8,9], centrifugal pumps [10][11][12][13], axial-flow pumps [14][15][16][17], and even hydraulic turbines [18][19][20], which have obtained more accurate results. Wei [4] studied the mechanical properties of a mixed-flow pump rotor with the help of the bidirectional synchronous solution method and found that, compared with other positions, fatigue damage is more likely to occur at the hub.…”

Section: Introductionmentioning

confidence: 99%

Study on Fatigue Characteristics of Axial-Flow Pump Based on Two-Way Fluid–Structure Coupling

Bai

2022

Energies

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When an axial-flow pump is running, there is a very complex flow inside the runner. Based on the two-way fluid–structure coupling method, this paper simulated the forward and reverse operating conditions of an axial-flow pump and calculated the dynamic stress distribution on the blade surface. The stress load spectrum was loaded onto the blade, and fatigue characteristic analysis was carried out to obtain the fatigue life and damage of the blade. This research shows the following: under different working conditions, the dynamic stress is concentrated at the root of the blade, and its amplitude decreases with the increase in the flow rate; at the same time, the change in stress with time shows a periodic change law. Under the working conditions of the turbine, the main frequency is the rotational frequency, and the secondary frequency is composed of multipliers of the rotational frequency, which is obviously affected by the number of blades; the fatigue damage and stress distribution are consistent, and the damage is the most serious at the stress concentration point. The research results of this paper can provide theoretical guidance for the structural design and safe operation of axial-flow pumps.

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The dynamic characteristics of the ultimate strength of a turbine runner blade under hydraulic excitation

Cited by 6 publications

References 7 publications

Acoustic Vibration Approach for Detecting Faults in Hydroelectric Units: A Review

Acoustic Vibration Approach for Detecting Faults in Hydroelectric Units: A Review

Influence of runner eccentricity on the hydraulic performance of tubular turbine: A comparative case study

Study on Fatigue Characteristics of Axial-Flow Pump Based on Two-Way Fluid–Structure Coupling

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