3D numerical simulation of transient processes in hydraulic turbines

Cherny, S. G.; Чирков, Д. В.; Bannikov, Denis; Lapin, V. N.; Skorospelov, V. A.; Eshkunova, I; Avdushenko, A

doi:10.1088/1755-1315/12/1/012071

Cited by 37 publications

(14 citation statements)

References 1 publication

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“…In this period of time, the guide vane lag time is T C and the speed rises freely under the condition of invariable initial Guide Vane Opening (GVO) value. According to the angular momentum equation, the formula of rotating speed is 31,32…”

Section: Rotational Dynamics Principlementioning

confidence: 99%

Analysis of load rejection transient process based on static efficiency factor for hydraulic unit security assessment

Tong

Cong

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part C:

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Hydraulic units often come across condition changes such as start-up, normal stop and load rejection. Load rejection transient process (LRTP) is one of the running conditions which make the unit and water diversion system in worst operation state. It has great influence on the safety and stability of hydraulic units. A new method called SE-ICNA which is based on Internal Characteristic Numerical Algorithm (ICNA) and static efficiency (SE) iteration is proposed. The analysis of rotating speed rising ratio (RS-RR) and pressure rising ratio (P-RR) in LRTP is mainly discussed for hydraulic unit security assessment. The correctness and rationality of SE-ICNA can be verified by means of Transient Process (TP) analysis on medium and small units within the scope of different water levels. Verification examples proved that this method has an excellent performance for hydraulic unit security assessment in low water level conditions. A conclusion is made that the proposed SE-ICNA method can well assess the security of small hydraulic units in low head conditions.

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Section: Rotational Dynamics Principlementioning

confidence: 99%

Analysis of load rejection transient process based on static efficiency factor for hydraulic unit security assessment

Tong

Cong

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Zhou [21] simulated runaway transient of a propeller turbine model. A combined approach, the pipe system part using 1D-MOC method and the hydro unit part using 3D method, was used to research hydraulic turbine flows in transient operating regimes [22][23][24][25]. Liu [26] simulated a part of the transient power failure process of a prototype pump-turbine.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Pumped Storage Hydropower Power-Off Transient Process Using 3D Numerical Simulation Based on SP-VOF Hybrid Model

2018

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The transient characteristic of the power-off process is investigated due to its close relation to hydraulic facilities' safety in a pumped storage hydropower (PSH). In this paper, power-off transient characteristics of a PSH station in pump mode was studied using a three-dimensional (3D) unsteady numerical method based on a single-phase and volume of fluid (SP-VOF) coupled model. The computational domain covered the entire flow system, including reservoirs, diversion tunnel, surge tank, pump-turbine unit, and tailrace tunnel. The fast changing flow fields and dynamic characteristic parameters, such as unit flow rate, runner rotate speed, pumping lift, and static pressure at measuring points were simulated, and agreed well with experimental results. During the power-off transient process, the PSH station underwent pump mode, braking mode, and turbine mode, with the dynamic characteristics and inner flow configurations changing significantly. Intense pressure fluctuation occurred in the region between the runner and guide vanes, and its frequency and amplitude were closely related to the runner's rotation speed and pressure gradient, respectively. While the reversed flow rate of the PSH unit reached maximum, some parameters, such as static pressure, torque, and pumping lift would suddenly jump significantly, due to the water hammer effect. The moment these marked jumps occurred was commonly considered as the most dangerous moment during the power-off transient process, due to the blade passages being clogged by vortexes, and chaos pressure distribution on the blade surfaces. The results of this study confirm that 3D SP-VOF hybrid simulation is an effective method to reveal the hydraulic mechanism of the PSH transient process.

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“…CFD has been used by various authors to analyse unsteady conditions in Francis and pump turbines, such as runaway (e.g. [1][2][3]) start-up [4], speed no load conditions [5] or load rejection [6]. In previous work, the authors investigated the transient for a relatively large guide vane opening angle of 25° and compared simulated results to measured data [7,8].…”

Section: Introductionmentioning

confidence: 99%

Influence of guide vane opening on the flow phenomena in a pump turbine during a fast transition from pump mode to generating mode

Stens

Riedelbauch

2017

J. Phys.: Conf. Ser.

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3D numerical simulation of transient processes in hydraulic turbines

Cited by 37 publications

References 1 publication

Analysis of load rejection transient process based on static efficiency factor for hydraulic unit security assessment

Analysis of load rejection transient process based on static efficiency factor for hydraulic unit security assessment

Investigation of Pumped Storage Hydropower Power-Off Transient Process Using 3D Numerical Simulation Based on SP-VOF Hybrid Model

Influence of guide vane opening on the flow phenomena in a pump turbine during a fast transition from pump mode to generating mode

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