A Behavior of the Diffuser Rotating Stall in a Low Specific Speed Mixed-Flow Pump

Miyabe, Masahiro; Furukawa, Akinori; Maeda, Hideaki; Umeki, Isamu; Jittani, Yoshinori

doi:10.5293/ijfms.2009.2.1.031

Cited by 19 publications

(15 citation statements)

References 9 publications

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“…The experimental system is shown in figure.1. In this paper, PIV will be applied to measure the flow field, which has been widely used in measuring the internal flow in the pump [8,9] . For the PIV measurement, pump is made of organic glass, and the frequency converter is used to start the pump.…”

Section: Experimental Devicementioning

confidence: 99%

Research of liquid-solid two phase flow in centrifugal pump with crystallization phenomenon

Liu

Wang

et al. 2014

International Journal of Fluid Machinery and Systems

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Particle Image Velocimetry combined with developed image processing method is adopted to study the liquid-solid two phase flow in the centrifugal pump impeller with crystallization phenomenon. The tracer particle is used to follow the liquid phase, which has the diameter between 8 to 12μm. The crystal particle precipitates from the sodium sulfate solution does change the wavelength of the laser, and which has great laser scattering characteristics . The diameter of the crystal particle is larger than 20μm. Through calculating the diameter of the particles in the image, the tracer particle and the crystal particle can be distinguished. By analyzing the experimental result, the following conclusion has been obtained. During the delay period, there is not any crystal particle and the pump performance has not been changed. As the crystallization process begins, the crystal nuclei appears from the supersaturation solution and grows larger with temperature decreasing, which has the tendency of moving towards the pressure side. The characteristics of liquid-solid two phase flow with crystallization phenomenon in the pump are obtained according to analysis of experimental results, and some guiding advices are presented to mitigate the crystallization phenomenon in pump impeller.

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Section: Experimental Devicementioning

confidence: 99%

Research of liquid-solid two phase flow in centrifugal pump with crystallization phenomenon

Liu

Wang

et al. 2014

International Journal of Fluid Machinery and Systems

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“…2. Pumping head variations for pumped storage power-stations [2] Pump turbine needs two-way operation, both pump and turbine working mode, operating conditions throughout the pump, pump brake, turbine, turbine brake, reverse blocked --unobstructed [8] . This cyclic process leads to a sharp increase in the hydraulic loss in the guide vane, which is then reflected in the hump of the performance curve or characteristic curve [7] .…”

Section: Introductionmentioning

confidence: 99%

Experimental research on flow field of a high head model pump turbine based on PIV test

Liu

Zhao

2020

Preprint

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Pump turbine operating conditions are complex, mainly including turbine mode and pump mode. Pump turbines have various instability problems during operation, such as S-shaped, pump hump, pressure pulsation and cavitation. PIV (Particle Image Velocimetry) is a very effective test technique for the internal flow field observation of pump turbines. In this paper, the internal flow field of pump hump, cavitation, pressure pulsation and four quadrants of the pump turbine are tested by PIV technology. The experimental observations show that the internal flow on those unstable working conditions of the pump turbine is extremely complicated. Those conditions which the vortex separation is serious and the flow angle is changed is far away the best efficiency working condition. Since the operating condition deviates from the optimal operating condition, the inflow Angle is changed and the inflow Angle is far away from the optimal inflow Angle.And the vortex induces and develops strongly by PIV test. The flow phenomenon are demonstrated at each operating points by PIV test.

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“…Energy performance and flow patterns of a mixed-flow pump with different tip clearances were investigated by Hao et al 7 and Liu et al, 8 based on which the influence of blade rotational angle and T-shape tip clearance was also studied. 9,10 DPIV was employed by Miyabe et al [11][12][13][14][15][16] to illustrate the inner flow of the vane. It was found that the periodic backflow at the inlet of guide vane under the low flow condition is one of the reasons for the positive slope of the performance curve.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of the pressure fluctuation in a mixed-flow pump under low flow conditions

Shen

Zhang

Zhao

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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In this paper, the large eddy simulation is utilized to simulate the flow field in a mixed-flow pump based on the standard Smagorinsky subgrid scale model, which is combined with the experiments to investigate pressure fluctuations under low flow conditions. The experimental results indicated that the amplitude of fluctuation at the impeller inlet is the highest, and increases with the reduction of the flow rate. The main frequencies of pressure fluctuation at the impeller inlet, impeller outlet, and vane inlet are blades passing frequency, while the main frequency at the vane outlet changes with the flow rate. The results of the simulation showed that the axial plane velocity at impeller inlet undergoes little change under 0.8 Qopt. In case of 0.4 Qopt, however, the flow field at impeller inlet becomes complicated with the axial plane velocity changing significantly. The flow separation is generated at the leading edge of the suction surface at t* = 0.0416 under 0.4 Qopt, which is caused by the increase of the incidence angle and the influence of the tip leakage flow. When the impeller rotates from t* = 0.0416 to t* = 0.1249, the flow separation intensified and the swirling strength of the separation vortex is gradually increased, leading to the reduction of the static pressure, the rise of adverse pressure gradient, and the generation of backflow. The static pressure at the leading edge of the impeller recovers gradually until the backflow is reached. In addition, the flow separation is the main reason for the intensification of the pressure fluctuation.

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A Behavior of the Diffuser Rotating Stall in a Low Specific Speed Mixed-Flow Pump

Cited by 19 publications

References 9 publications

Research of liquid-solid two phase flow in centrifugal pump with crystallization phenomenon

Research of liquid-solid two phase flow in centrifugal pump with crystallization phenomenon

Experimental research on flow field of a high head model pump turbine based on PIV test

Numerical and experimental investigation of the pressure fluctuation in a mixed-flow pump under low flow conditions

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