Anti-cavitation performance of a splitter-bladed inducer under different flow rates and different inlet pressures

Guo, Xiaomei; Zhu, Zuchao; Cui, Baoling; Huang, Yong

doi:10.1007/s11431-015-5928-7

Cited by 8 publications

(6 citation statements)

References 21 publications

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“…The Navier-Stokes equation based on the Newtonian fluid was used in this simulation. The equation was formulated in the Cartesian coordinate system as: [23] ( ) 0 To increase the visibility of the inducer, the inlet flange of the original pump casing was cut off. Then, a transparent plexiglass pipe was installed at the front of the pump casing.…”

Section: Continuity Equation and Momentum Equationmentioning

confidence: 99%

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Research on Visualization of Inducer Cavitation of High-Speed Centrifugal Pump in Low Flow Conditions

Kong

Zhang

et al. 2021

JMSE

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Inducer is often used to improve the cavitation performance of pump. In order to study the cavitation characteristics of inducer under low flow condition of high-speed pump, high-speed photography technology was employed in this paper to carry out visual experiments on the inducer of a high-speed centrifugal pump. In low flow rates, Cavitation distribution and evolution among the inducer were captured. The experimental results revealed that a band-shaped backflow vortex in the inlet pipe would occur when the flow rate was less than 0.3 Qd. Moreover, the backflow vortex in the inlet pipe rotated with the inducer and the rotational speed of backflow vortex was approximately half of the inducer. The visualization test of 0.27 Qd was carried out: when the NPSH was greater than 6.72 m, the bubbles in the inlet pipe were asymmetrical; When the NPSH dropped to 5.41 m, the cavitation was becoming less asymmetrical; When NPSH dropped to 3.81 m, cavitation evolved to the deteriorating stage, plenty of bubbles entered into the main impeller, resulting in a rapid decline of pump performance. Furthermore, the cavitation performance was worse at an extreme flow rate, and the NPSH value of 0.27 Qd was 7.5% greater than that under design condition.

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Section: Continuity Equation and Momentum Equationmentioning

confidence: 99%

“…The Navier-Stokes equation based on the Newtonian fluid was used in this simulation. The equation was formulated in the Cartesian coordinate system as: [23]…”

Section: Continuity Equation and Momentum Equationmentioning

confidence: 99%

Research on Visualization of Inducer Cavitation of High-Speed Centrifugal Pump in Low Flow Conditions

Kong

Zhang

et al. 2021

JMSE

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“…Boundary conditions are set as velocity-inlet at the pump inlet, outflow at the volute exit. The standard k-ε turbulence model [1] with standard wall function is adopted for calculation, in which the SIMPLE algorithm is used for pressure-velocity coupling. The governing equations were discretized by the second-order upwind scheme for the momentum terms and the first order upwind format for the other terms for ensuring both the accuracy and computation economy, and the calculation residual is set to 10 -4…”

Section: Numerical Algorithmmentioning

confidence: 99%

“…A lot of investigation, such as flow in impeller and volute of the centrifugal pump, cavitation, vibration etc., have been finished by CFD numerical simulation. As the centrifugal pump performance is relative stable, being considered time-independent during pump running process, a steady numerical method is frequently used to simulate the pump characteristics for comparing and optimizing pump structure and performance [1][2][3][4][5][6] . However, a frozen rotor method used in steady simulation of centrifugal pump assumes the impeller has an unchanged location against the volute, and it is completely different from the true case, in which the boundary condition of a fixed point at the exit of the impeller changes with rotation.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Relative Position of a Centrifugal Impeller Blade Against the Tongue on the Steadily Simulated Pump Performance

Ma¹,

Ma²,

Li³

2018

dtcse

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Abstract. The performance of a single-stage centrifugal pump with designed flow rate of 0.028m 3 /s, head of 20m and rotating speed of 1450rpm have been steadily simulated for four geometric models, in which the angle between the impeller blade and the tongue is 44°, 29°, 15°and 0° (where the blade meets the tongue) separately. The comparison of the simulated results to the experimental data show that the computed head and power are lower than that of the experiment, but the efficiency is up to 12.0% higher than the test result. The steadily simulated characteristics of the pump in four cases change with the blade relative location against the tongue. At the small flow rate of 0.6Qd (Qd is the designed flow rate), the pump head fluctuation ΔH is nearly 2.14m, pump efficiency fluctuation Δη reaches 3.06%, and the impeller efficiency variation Δηi reaches up to 8.0%. At the high flow rate of 1.4Qd, ΔH equals 1.45m, Δη is approximately 6.68%, and Δηi is 1.03%. Under the design condition, the pump performance in four cases are almost the same show that the angle between the impeller blade and the tongue has neglectable effect. At last, unsteady simulation of the pump performance has been carried out and compared to experimental result. It indicates that the unsteady simulation is in agreement with the experiments. As a result, careful consideration should be taken while optimizing the pump performance by a method of steady simulation.

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“…There are many types of inducer structures, and a large number of studies have shown that equipping an inducer can improve the cavitation resistance of a centrifugal pump [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Tip Clearance on the Cavitation Flow in a Shunt Blade Inducer

et al. 2022

Self Cite

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In order to study the effect of tip clearance on the internal cavitation stability of a shunt blade inducer, an external characteristics experiment of a centrifugal pump with a shunt blade inducer was carried out. Based on the turbulence model and mixture model, the cavitating flow in a centrifugal pump with the inducer was numerically simulated. The influence of tip clearance on the cavitating flow in a shunt inducer was studied and analyzed. Through the research, it was found that tip clearance has a certain influence on the critical cavitation coefficient. The existence of the tip clearance caused a significant leakage vortex near the inducer’s inlet and a strong transient effect was shown. The location and degree of cavitation caused by the tip leakage are clarified in this paper. Tip clearance has a great impact on the pressure distribution on a shunt blade inducer. The influence law of tip clearance on an inducer’s blade load distribution was clarified. The results showed that tip clearance has a significant effect on the cavitation of a shunt blade inducer under low flow rate conditions.

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Anti-cavitation performance of a splitter-bladed inducer under different flow rates and different inlet pressures

Cited by 8 publications

References 21 publications

Research on Visualization of Inducer Cavitation of High-Speed Centrifugal Pump in Low Flow Conditions

Research on Visualization of Inducer Cavitation of High-Speed Centrifugal Pump in Low Flow Conditions

Effects of the Relative Position of a Centrifugal Impeller Blade Against the Tongue on the Steadily Simulated Pump Performance

Effect of Tip Clearance on the Cavitation Flow in a Shunt Blade Inducer

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