Numerical Study of Rotating Stall in a Pump Vaned Diffuser

Sano, Takeshi; Yoshida, Yoshiki; Tsujimoto, Yoshinobu; Nakamura, Yuki; Matsushima, Tatsuhito

doi:10.1115/1.1459076

Cited by 79 publications

(36 citation statements)

References 5 publications

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“…Their results compared with PIV results obtained in a previous experimental analysis [16] had better predicted the flow field evolution than the most common turbulence models of those years (k-ε and Baldwin-Lomax turbulence models). Another numerical analysis was presented by Sano et al [17], demonstrating the development of a rotating stall which causes in the diffuser channels the switching between reverse and jet flows, in good agreement with experimental results.…”

Section: Introductionsupporting

confidence: 58%

Numerical Analysis of the Transient Behaviour of a Variable Speed Pump-Turbine during a Pumping Power Reduction Scenario

2016

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To achieve the carbon free electricity generation target for 2050, the penetration of renewable energy sources should further increase. To address the impacts of their unpredictable and intermittent characteristics on the future electricity grid, Pumped Hydro Energy Storage (PHES) plants should enhance their regulation capability by extending their continuous operating range far beyond the optimal normal working range. However, for the time being, the regulation capability of the new generation of PHES, equipped with reversible pump-turbines due to their cost-effectiveness, is limited at part load by instability problems. The aim of this paper is to analyse, during a pumping power reduction scenario, the onset and development of unsteady phenomena leading to unstable behaviour. A 3D transient numerical simulation was carried out on the first stage of a variable-speed two-stage pump-turbine from full load to the unstable operating zone by progressively reducing the speed from 100% to 88% rpm corresponding to a power reduction from full load to about 60% with a ramp rate of 1.5% per s. Two three-dimensional unsteady flow structures affecting the return channel and the wicket gates at the end of the first stage were identified and their evolution in the power regulation scenario was fluid-dynamically and spectrally characterized to determine the fluid-dynamical conditions causing the head drop in the hump zone.

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Section: Introductionsupporting

confidence: 58%

Numerical Analysis of the Transient Behaviour of a Variable Speed Pump-Turbine during a Pumping Power Reduction Scenario

2016

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“…Many researches have been carried out to investigate unsteady flow in centrifugal pump. At off-design conditions, separate flow would develop on blade suction side leading to partial impeller channels being blocked [9]. At low flow rates, especially, the separate flow structure may transfer from one blade channel to the adjacent channel forming rotating stall phenomenon [10].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Vibration Characteristics in a Centrifugal Pump with Special Slope Volute

Zhang

Yang

Gao

et al. 2014

Advances in Mechanical Engineering

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Vibration is one of the main problems which should be considered seriously in designing and operating a centrifugal pump. In this paper, a special slope volute was proposed to reduce vibration level of centrifugal pump. The goal of this paper was to analyze vibration characteristics of slope volute pump and provide a new method to reduce vibration energy in centrifugal pump. Experiments were carried out to obtain vibration signals at different flow rates of slope volute pump, which were compared with conventional spiral volute pump. Results show that vibration level is closely related to flow structure interior pump. At low flow rates, especially, vibration energy increases rapidly with the onset of rotating stall. Rotor-stator interaction mechanism changes when adopting slope volute. In slope volute pump, the peaks in power spectra correspond to different harmonics of BPF at three measuring directions; however, in spiral volute pump, the predominant components always correspond to 2 BPF . From comparison of vibration level in different frequency bands, it is found that vibration level of slope volute pump is smaller than conventional spiral volute pump. So vibration energy of centrifugal pump can be reduced effectively using slope volute.

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“…Niazi et al performed the three-dimensional numerical simulation of a high-speed transonic fan rotor considering external disturbance, and the results showed that the reflux first occurred near the blade leading-edge in the rotor tip clearance area [2]. Sano et al conducted detailed research on the unsteady flow phenomena inside the pump vaned diffuser, such as the rotating stall, the alternate blade stall, and the asymmetric stall [3]. Shen et al presented a three-dimensional model to study the occurrence of weak rotating waves in vaneless diffusers of centrifugal compressors, and the results showed that the critical flow angle and the stall propagation velocity were affected by the axial distributions of undisturbed flow at the diffuser inlet [4].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Broadband Noise Sources of an Axial Fan under Rotating Stall Conditions

Zhang

Wang

2014

Advances in Mechanical Engineering

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Study on the influence of rotating stall on the aerodynamic noise of axial fan has important value to warn of the occurrence of stall through monitoring the noise variations. The present work is to analyze the aerodynamic noise before and after the phenomenon of rotating stall by solving Navier-Stokes equations, coupled with the throttle condition and the broadband noise sources model. The impeller exit rotational Mach number and rotational Reynolds number are separately 0.407 and 8.332 × 106 . The results show that the aerodynamic noise source of the fan is mainly the rotation noise under the design condition. The vortex noise accounts for the major part of fan noise after the occurrence of stall, and the maximum acoustic power level of the fan appears in the rotor domains. In the evolution process from the stall inception to the stall cell, the high noise regions of the rotor develop along the radial, circumferential, and axial directions, and the area occupied by high noise regions increases from 33% to 46% impeller channels area. On rotating stall condition, the high noise regions occupying about 46% impeller channels area propagate with the stall cell along the circumferential direction at a half of rotor speed.

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Numerical Study of Rotating Stall in a Pump Vaned Diffuser

Cited by 79 publications

References 5 publications

Numerical Analysis of the Transient Behaviour of a Variable Speed Pump-Turbine during a Pumping Power Reduction Scenario

Numerical Analysis of the Transient Behaviour of a Variable Speed Pump-Turbine during a Pumping Power Reduction Scenario

Investigation on Vibration Characteristics in a Centrifugal Pump with Special Slope Volute

Simulation of Broadband Noise Sources of an Axial Fan under Rotating Stall Conditions

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