A Study of Flow Analysis for a Double-Suction Centrifugal Pump

Chung, Kyung-Nam; Park, Pyun-Gu; Cho, Hyun-Joon; Lee, Sang-Gu

doi:10.1115/fedsm2002-31180

Cited by 2 publications

(3 citation statements)

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“…The time step for transient calculation was set to 1/4500 s, corresponding to the time interval for the impeller to travel 2°. The target of maximal residual in each step was set as 5 × 10 − 4 with a maximal iteration of 20. The total calculation time was 0.6 s, corresponding to the time of 15 impeller revolutions.…”

Section: Numerical Methodologymentioning

confidence: 99%

“…However, the hypothesis of uniform inflow condition is inevitably applied in pump design, 2 resulting in the operating efficiency usually being lower than the design efficiency, especially for double-suction pumps. 3,4 Inflow distortion behaves as strong shear flow with large-gradient velocity, reverse flow near the shroud, and prewhirl. [5][6][7] These flows cause large deviations between experiment performance and actual performance, cavitation, increased pressure fluctuation, vibration, operating noise, and decreased blade service life.…”

Section: Introductionmentioning

confidence: 99%

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Mechanisms of performance degradation in a double-suction centrifugal pump under inflow distortions

Wang

Liu

Jiang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Inlet pipes of the centrifugal pump are generally bent to fit in the limited installation space, which can cause inflow distortions for two sides of the double-suction impeller. This study aimed to understand the effect of primary geometric parameters of inlet pipes, including corner angle, straight pipe length downstream of elbow, and turning radius, on pump performance and pressure fluctuations. The pump head, efficiency, and pressure fluctuations were measured for six kinds of inlet pipes in the experiment. Unsteady numerical simulations were performed to understand the flow mechanisms. Results indicate that the bending of inlet pipes is a significant reason for the loss of pump head and efficiency. The penalty on pump performance is augmented by the increase in corner angle, decrease in turning radius, and installation of a short straight pipe downstream of the elbow. Pump efficiency could be maximally reduced by 6.58% with a large corner angle and a small turning radius. The bending of inlet pipes induces pressure imbalance for the two sides of the impeller and increases low-frequency disturbance in the suction chamber, which are responsible for the performance loss. Numerical results reveal that the low-frequency disturbance is caused by the vortex formed in the suction chamber, and the accompanying secondary vortex aggravates the pressure fluctuation synchronously. Parametric studies conclude that the corner angle should be minimized to reduce the penalty on pump performance and pressure fluctuations, and a long straight pipe downstream of the elbow can be installed to decrease vibration for the pump with bent inlet pipes.

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Section: Numerical Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanisms of performance degradation in a double-suction centrifugal pump under inflow distortions

Wang

Liu

Jiang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

show abstract

“…Also, the flow characteristics in the turbine mode were explored. Kyung et al [19] investigated the velocity and pressure distributions in the impeller in a double-suction centrifugal pump at different flow rates with an impeller-only model and a full pump model. Fernández et al [20] studied the effect of inlet nonuniformities by comparing the features of the flow patterns near the volute tongue.…”

Section: Introductionmentioning

confidence: 99%

Flow Characteristics in Volute of a Double-Suction Centrifugal Pump with Different Impeller Arrangements

et al. 2019

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As an important type of centrifugal pump, the double-suction pump has been widely used due to its high efficiency region and large flow rate. In the present study, the complex flow in volute of a double-suction centrifugal pump is investigated by numerical simulation using a re-normalization group (RNG) k-ε model with experimental validation. Axial flows are observed in volute near the impeller outlet and compared with four staggered angles. The net area-weighted average axial velocities decrease as the staggered angle increases. The axial flows are mainly caused by the different circumferential pressure distribution at the twin impeller outlet. The dominant frequencies of the axial velocities for different staggered angles are fBP and its harmonic. The pressure fluctuations in most regions of the volute are obtained by superimposing the pressure generated by the two impellers.

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A Study of Flow Analysis for a Double-Suction Centrifugal Pump

Cited by 2 publications

References 0 publications

Mechanisms of performance degradation in a double-suction centrifugal pump under inflow distortions

Mechanisms of performance degradation in a double-suction centrifugal pump under inflow distortions

Flow Characteristics in Volute of a Double-Suction Centrifugal Pump with Different Impeller Arrangements

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