Ziwu Guan
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View article: Investigation on formation mechanism of cavitation channel vortex in the runner of Francis turbine
Investigation on formation mechanism of cavitation channel vortex in the runner of Francis turbine Open
Cavitation channel vortices generally cause flow state more complex in the runner, leading to the work efficiency is reduced and the cavitation erosion on flow components is enhanced. In this paper, simulation of cavitation flow is carried…
View article: Analysis of the cause of the 40Hz frequency component in spiral casing of a high-head pump turbine
Analysis of the cause of the 40Hz frequency component in spiral casing of a high-head pump turbine Open
Vibration and noise problems affect the safe and stable operation of pump turbines. For the design of pump turbines, it is crucial to accurately identify the excitation sources and their evolution laws that cause vibration and noise. Based…
View article: Investigation on hydraulic loss characteristic of Kaplan turbines based on entropy generation theory
Investigation on hydraulic loss characteristic of Kaplan turbines based on entropy generation theory Open
In this paper, the hydraulic losses of a Kaplan turbine under optimal and rated operating conditions are investigated through the theory of entropy generation. The results show that hydraulic loss values calculated using pressure drop and …
View article: Vibration and noise of a high head pump turbine: analysis and improvement
Vibration and noise of a high head pump turbine: analysis and improvement Open
In a high head pumped storage power plant with 9 blades and 20 guide vanes, vibration and noise problems occurred with characteristic frequency of 2 times the blade passing frequency (BPF). It is found that the first main frequency of pres…
View article: Model experimental study on special frequency of hydraulic pump working condition headcover for ultra-high head pump-turbine
Model experimental study on special frequency of hydraulic pump working condition headcover for ultra-high head pump-turbine Open
With the accelerated construction of pumped-storage power stations, high-head and high-capacity pumped-storage units are gradually becoming the mainstream of development. When operated on-site, the high-head and high-capacity pumped-storag…
View article: Mechanism analysis of the abnormal head-cover vibration of an ultra-high-head pump-turbine operating in pump mode by CFD and FEM
Mechanism analysis of the abnormal head-cover vibration of an ultra-high-head pump-turbine operating in pump mode by CFD and FEM Open
Hydraulic excitation causes abnormal head-cover vibration in some pump-turbines, particularly as design heads continue to rise. Pump-turbines with heads exceeding 600 m have reported such vibrations in pump mode, and it is urgent to reveal…
View article: Numerical investigation of the upper part load vortex rope behaviour in a Francis turbine
Numerical investigation of the upper part load vortex rope behaviour in a Francis turbine Open
The vortex rope in the draft tube is considered as the source of the upper part load pressure pulsations, which is one of some unstable phenomena in a Francis turbine. In this study, the pressure pulsations and the vortex rope in the draft…