Cavitation flow simulation for a centrifugal pump at a low flow rate

Tan, Lei; Zhu, Bo; Cao, Shuai; Wang, Yuming

doi:10.1007/s11434-013-5672-y

Cited by 37 publications

(13 citation statements)

References 12 publications

(17 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The advantage of this method has been verified by Barrio et al [22] and Tan et al [23,24]. The no-slip boundary conditions are set at the flow near walls, and the pressure at the pump inlet and mass flow rate at the pump outlet are specified in accordance with the experimental measurement.…”

Section: Mathematical Model and Methodsmentioning

confidence: 93%

Energy Performance and Radial Force of a Mixed-Flow Pump with Symmetrical and Unsymmetrical Tip Clearances

et al. 2017

Self Cite

View full text Add to dashboard Cite

Abstract:The energy performance and radial force of a mixed flow pump with symmetrical and unsymmetrical tip clearance are investigated in this paper. As the tip clearance increases, the pump head and efficiency both decrease. The center of the radial force on the principal axis is located at the coordinate origin when the tip clearance is symmetrical, and moves to the third quadrant when the tip clearance is unsymmetrical. Analysis results show that the total radial force on the principal axis is closely related to the fluctuation of mass flow rate in each single flow channel. Unsteady simulations show that the dominant frequencies of radial force on the hub and blade correspond to the blade number, vane number, or double blade number because of the rotor stator interaction. The radial force on the blade pressure side decreases with the tip clearance increase because of leakage flow. The unsymmetrical tip clearances in an impeller induce uneven leakage flow rate and then result in unsymmetrical work ability of each blade and flow pattern in each channel. Thus, the energy performance decreases and the total radial force increases for a mixed flow pump with unsymmetrical tip clearance.

show abstract

Section: Mathematical Model and Methodsmentioning

confidence: 93%

Energy Performance and Radial Force of a Mixed-Flow Pump with Symmetrical and Unsymmetrical Tip Clearances

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…Meanwhile, in this study, ANSYS_CFX 15.0 was implemented to solve the steady Reynolds-Averaged Navier-Stokes (RANS) equations. The governing equations for incompressible fluid are written below [19][20][21][22].…”

Section: Numerical Methodology 31 Governing Equationsmentioning

confidence: 99%

Analysis of flow and phase interaction characteristics in a gas-liquid two-phase pump

Zhang

2018

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

To analyze the characteristics of internal flow and phase interaction in a gas-liquid two-phase pump, the influence of Inlet Gas Void Fraction (IGVF), discharge coefficient, and medium viscosity were investigated using medium combinations of air-water and air-crude. Simulations were performed using ANSYS_CFX at different IGVFs and various values of discharge coefficient. Structured grid for the full flow passage was generated using ICEM_CFD and TurboGrid. Under conditions of IGVF = 0% (pure water) and IGVF = 15%, the reliability of numerical method was proved by means of the comparison with the experimental data of external characteristic. The results for air-water combination showed a uniform gas distribution in the inlet pipe, and formation of a stratified structure in the outlet pipe. The gas in impeller gathered at the hub because of the rotation of the impeller, also, the interphase forces increased with the increased IGVF. For the two medium combinations, the drag force was the largest interphase force, followed by added mass and lift forces, and then the turbulent dispersion force was the least, which can be neglected. Because of the larger viscosity of crude than that of water, the variation trend of interphase forces in the impeller is relatively smooth along the flow direction when the medium combination was air-crude.

show abstract

“…This pressure drop can lead to serious cavitation in the operation of pump and turbine. Cavitation is known to cause intensive noise, vibration, and erosion for machinery components [23]. In an axial waterjet pump, Tan et al [24] found that the apex angle between the perpendicular cavitation vortex (PCV) and the blade tip increases from 8° to 12° when the cavitation number varies from 0.39 to 0.45, indicating a linear relationship in this range, as shown in Figure 11.…”

Section: Cavitation Behaviormentioning

confidence: 95%

A Review of Tip Clearance in Propeller, Pump and Turbine

2018

Self Cite

View full text Add to dashboard Cite

Propellers, pumps, and turbines are widely applied in marine equipment, water systems, and hydropower stations. With the increasing demand for energy conservation and environmental protection, the high efficiency and the stable operation of pumps and turbine have been drawing great attention in recent decades. However, the tip clearance between the rotating impeller and the stationary shroud can induce leakage flow and interact with the main stream, introducing complex vortex structures. Consequently, the energy performance and the operation stability of pumps and turbines deteriorate considerably. Constant efforts are exerted to investigate the flow mechanism of tip-clearance flow and its induced influence on performance. However, due to various pump and turbine types and the complexity of tip-clearance flow, previous works are usually focused on a specific issue. Therefore, a systematic review that synthesizes the related research is necessary and meaningful. This review investigates related research in the recent two decades in the perspectives from fundamental physics to engineering applications. Results reveal the vortex types, trajectory, evolution, and cavitation behaviors induced by tip-clearance flow. It is concluded that the influence characteristics of tip clearance on energy performance are closely related to the machinery type. Tip-clearance size and tip shape are found to be crucial parameters for tip-leakage vortex (TLV). The proposed optimization schemes are also demonstrated to provide inspiration for future research. Overall, this review article provides a coherent insight into the characteristics of tip-clearance flow and the associated engineering-design applications. On the basis of these understandings, comments on conducted research and ideas on future research are proposed.

show abstract

Cavitation flow simulation for a centrifugal pump at a low flow rate

Cited by 37 publications

References 12 publications

Energy Performance and Radial Force of a Mixed-Flow Pump with Symmetrical and Unsymmetrical Tip Clearances

Energy Performance and Radial Force of a Mixed-Flow Pump with Symmetrical and Unsymmetrical Tip Clearances

Analysis of flow and phase interaction characteristics in a gas-liquid two-phase pump

A Review of Tip Clearance in Propeller, Pump and Turbine

Contact Info

Product

Resources

About