Experimental Analysis of Diffuser Rotating Stall in a Three-Stage Centrifugal Pump

Takamine, Taiki; Furukawa, Daichi; Watanabe, Satoshi; Watanabe, Hiroyoshi; Miyagawa, Kazuyoshi

doi:10.5293/ijfms.2018.11.1.077

Cited by 7 publications

(4 citation statements)

References 12 publications

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“…Many scholars have carried out a great deal of research on the factors affecting the stall of centrifugal pumps. The main influencing factors are pump flow [19][20][21][22][23], impeller speed [24][25][26], number of blades [27,28], and rotor-stator interaction [29][30][31]. For the guide-vane centrifugal pump, the clocking position of the guide vane is also an important factor affecting the internal flow characteristics of the centrifugal pump.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Stall Characteristics of Centrifugal Pump with Guide Vanes

Huang³

et al. 2022

Water

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Stall usually occurs in the hump area of the head curve, which will block the channel and aggravate the pump vibration. For centrifugal pumps with guide vanes usually have a clocking effect, the stall characteristic at different clocking positions should be focused. In this paper, the flow field of the centrifugal pump under stall conditions is numerically simulated, and the rotor–stator interaction effects of the centrifugal pump under stall conditions are studied. The double-hump characteristic is found in the head curve by using SAS (Scale Adaptive Simulation) model. The hump area close to the optimal working condition is caused by hydraulic loss, while the hump area far away from the optimal working condition point is caused by the combined action of Euler’s head and hydraulic loss. The SAS model can accurately calculate the wall friction loss, thus predicting the double-hump phenomenon. The pressure fluctuation and head characteristics at different clocking positions under stall conditions are obtained. It is found that when the guide vanes outlet in line with the volute tongue, the corresponding head is the highest, and the pressure fluctuation is the lowest. The mechanism of the clocking effect in the centrifugal pump with guide vanes is obtained by simplifying the hydrofoil. It is found that when the downstream hydrofoil leading edge is always interfered with by the upstream hydrofoil wake, the wake with low energy mixes the boundary layer with low energy, which causes small-pressure pulsation. The results could be used for the operation of centrifugal pumps with guide vanes.

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Section: Introductionmentioning

confidence: 99%

Investigation on Stall Characteristics of Centrifugal Pump with Guide Vanes

Huang³

et al. 2022

Water

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“…No instability was observed in the original condition of the test pump, while after enlarging the radial gap between the impeller and the diffuser, the single stall cell propagating at about 14% of shaft speed was detected mainly in the third (final) stage diffuser [3]. Subsequently, the effect of axial offset of the whole rotor system was tested, and it was found that the rotating stall tends to be suppressed when the axial rotor offset is given toward the suction side [4]. Besides, the effects of enlargement of gaps at annular seals were also investigated, and it was found that the gap at the liner ring, which governs the leakage flow at the front side of impeller, especially has a remarkable effect on the rotating stall [5]; the rotating stall becomes to occur also in the first and second stages after enlarging the gap at the liner ring.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of radial thrust fluctuation caused by diffuser rotating stall in a centrifugal pump

Takamine

Watanabe

2022

J. Phys.: Conf. Ser.

Self Cite

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In this study, in order to understand the relation between the diffuser rotating stall and the fluctuating radial thrust, unsteady RANS simulation of a centrifugal pump was carried out. The rotating stall with single stall cell was qualitatively reproduced though the propagation speed was smaller than the experiment. The pressure amplitude caused by the rotating stall was comparable to the measured one, and the tendency that the propagation speed increases as the flow rate increases agreed with experiment. The radial thrust fluctuation due to the rotating stall was well evaluated by the simulation, and a considerable difference of phase angle between the stall cell position and the working direction of radial thrust was detected, which also agreed with experiment. On the basis of simulation result, the reason is found to be that the radial force acting on the impeller external wall at the liner ring section due to stall cell was not very small but comparable to that acting on the impeller blade and outer wall, while their working directions were roughly 100° different. This suggests that considering the leakage flow in numerical simulation is important to accurately predict the radial forces generated by rotating stall.

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“…Hamid et al [5][6][7] tested centrifugal pumps used for pumping water and light crude oil through experimental analysis and optimizing them using CFD tools. Watanabe et al [8,9] studied the forces in a three-stage centrifugal pump at design and off-design conditions using CFD simulations. Pumps are designed to withstand high temperatures and pressures, and they are able to pump fluids of different densities and viscosities.…”

Section: Introductionmentioning

confidence: 99%

Flow Field Analysis and Feasibility Study of a Multistage Centrifugal Pump Designed for Low-Viscous Fluids

Shamsuddeen

Kim

et al. 2021

Applied Sciences

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A multistage centrifugal pump is designed for pumping low-viscosity, highly volatile and flammable chemicals, including hydrocarbons, for high head requirements. The five-stage centrifugal pump consists of a double-suction impeller at the first stage followed by a twin volute. The impellers for stages two through five are single-suction impellers followed by diffuser vanes and return channel vanes. The analytical performance is calculated initially in the design stage by applying similarity laws to an existing scaled-down pump model designed for low flow rate applications. The proposed pump design is investigated using computational fluid dynamics tools to study its performance in design and off-design conditions for water as the base fluid. The design feasibility of the centrifugal pump is tested for other fluids, such as water at a high temperature and pressure, diesel and debutanized diesel. The pump design is found to be suitable for a variety of fluids and operating ranges. The losses in the pump are analyzed in each stage at the best efficiency point. The losses in efficiency and head are observed to be higher in the second stage than in other stages. The detailed flow behavior at the second stage is studied to identify the root cause of the losses. Design modifications are recommended to diminish the losses and improve the overall performance of the pump.

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Experimental Analysis of Diffuser Rotating Stall in a Three-Stage Centrifugal Pump

Cited by 7 publications

References 12 publications

Investigation on Stall Characteristics of Centrifugal Pump with Guide Vanes

Investigation on Stall Characteristics of Centrifugal Pump with Guide Vanes

Numerical investigation of radial thrust fluctuation caused by diffuser rotating stall in a centrifugal pump

Flow Field Analysis and Feasibility Study of a Multistage Centrifugal Pump Designed for Low-Viscous Fluids

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