Numerical prediction of 3-D periodic flow unsteadiness in a centrifugal pump under part-load condition

Pei, Ji; Yuan, Shouqi; Li, Xiaojun; Yuan, Jianping

doi:10.1016/s1001-6058(14)60029-9

Cited by 32 publications

(17 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Pei et al [17][18][19] investigated the flow unsteadiness behavior of a centrifugal pump and reported the significant effect of flow rate on time-averaged unsteadiness and distribution of turbulence intensity.…”

Section: Prefacementioning

confidence: 99%

“…Zhang et al [16] investigated a conventional spiral volute pump and demonstrated how slope volute contributes to the significant decline of pressure pulsation. Pei et al [17][18][19] investigated the flow unsteadiness behavior of a centrifugal pump and reported the significant effect of flow rate on time-averaged unsteadiness and distribution of turbulence intensity.…”

Section: Prefacementioning

confidence: 99%

See 1 more Smart Citation

Effects of Impeller Diameter on High‐Speed Rescue Pump

Bai

Kong

Xia

et al. 2017

Mathematical Problems in Engineering

View full text Add to dashboard Cite

Impeller diameter is a crucial design parameter of high-speed rescue pumps because it affects the performance and inner flow characteristics of these pumps. In this study, a pump with an impeller diameter of 248 mm was modeled and its performance was tested. Numerical simulations were conducted under steady and unsteady states, in which the sizes of the impeller diameters were designated as 248 mm (original), 235.6 mm (5% trimmed), 223.2 mm (10% trimmed), and 210.8 mm (15% trimmed). ANSYS software was used to test the shear stress transport (SST -) of the four models, and results agreed well with experimental data. Diameter size affected impeller characteristics in both steady and unsteady states. Subsequently, the differences in performance, hydraulic loss, pressure pulsation, and radial force of the impellers were evaluated. In the performance test, the head and efficiency of the pump decreased as impeller diameter was reduced. The result trends are in accordance with the trim law within the acceptable error range. In terms of hydraulic loss, the impeller and diffuser vane components presented opposite trends with flow rate increase. Finally, in terms of pressure pulsation and radial force, the amplitude diminished while periodicity improved as impeller diameter decreased. PrefaceThe number of mining flooding accidents has increased in China and in other countries, and rescue operation groups have since demanded for lower-volume, higher-powered, and higher-speed pumps compared with conventional types. The current rescue pumps used for mining flooding are the multistage types, which have sufficient power and head to alleviate flooding from the bottom to the ground, but are complex and too large to use in narrow mining wells [1][2][3][4]. Consequently, the research groups at Jiangsu University that are in charge of rescue pump development have designed a series of smallvolume, high-powered, and high-speed rescue pumps that can be easily used during mining flooding incidents.In recent years, computational fluid dynamics (CFD) analysis has been applied to the hydrodynamic design of several pump types due to the following reasons. First, the outcomes of hydraulic design and performance are difficult to predict because of complex geometric parameters. Second, constructing and testing physical prototypes are expensive and time-consuming endeavors, which reduce the profit margins of pump manufacturers. Consequently, several studies have been conducted on CFD to serve as guides for pump design and optimization [5][6][7][8][9][10][11][12][13][14]. In terms of pressure pulsation and radial force, Gao et al. [15] studied the static performance and pressure fluctuation of a large centrifugal pump and determined the main frequency of mine monitoring points; their findings agreed well with experimental data. Zhang et al.[16] investigated a conventional spiral volute pump and demonstrated how slope volute contributes to the significant decline of pressure pulsation. Pei et al. [17][18][19] investigated the flow unsteadiness ...

show abstract

Section: Prefacementioning

confidence: 99%

Section: Prefacementioning

confidence: 99%

Effects of Impeller Diameter on High‐Speed Rescue Pump

Bai

Kong

Xia

et al. 2017

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…Later, around the inside flow field fluctuation caused by the impeller-volute interaction, more experimental and numerical studies were undertaken to describe the transient flow phenomena and explain the formation mechanism behind it (e.g., Cheah et al [12] in 2008, Lucius et al [13] in 2010, Huang et al [14] and Dai et al [15] in 2013). The unsteady state analysis on fluctuation of flow parameters, such as pressure and hydraulic forces, can provide an essential reference for blade design [16,17], flow rate setup [18,19] and impact assessment under special working conditions [20].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Periodic Fluctuations in Energy Efficiency in Centrifugal Pumps at Different Working Points

Zhang

Deng

Qu³

2017

Energies

View full text Add to dashboard Cite

Abstract:In order to simulate the energy efficiency fluctuation behavior of an industrial centrifugal pump with a six-blade impeller, a full-scale three-dimensional (3D) an unsteady state computational fluid dynamics (CFD) model was used. Five operational points with different flow fluxes were numerically investigated by using the Navier-Stokes code with shear-stress transport (SST) k-ω turbulence model. The predicted performance curves agreed well with the test data. A sine function was fitted to the transient calculation results and the results show that the efficiency fluctuates mainly on the blade passing frequency, while the fluctuation level varies with flow rate. Furthermore, high efficiency is not necessarily associated with low fluctuation level. The efficiency fluctuation level is high at part-load points, and becomes relatively low when flow rate exceeds the design value. The effect of change in torque is greater than that of the head lift with respect to fluctuations of efficiency. Based upon the analysis of velocity vector distribution of different impeller phase positions, a hypothesis which considers both the effect of pump's structural shape and flow fluxes was proposed to explain the above behavior by analyzing the impeller-tongue interaction. This work enriches the theoretical system of flow parameters fluctuation of centrifugal pump, and provides useful insight for the optimal design of centrifugal pumps.

show abstract

“…José A. Caridad [10] simulated the characteristics of centrifugal pump blades in the gas-liquid two-phase flow by CFD, and discovered its characterization. According to the velocity triangles of the centrifugal pump, Pei Ji [ 11] deduced the volume of the unsteady flow intensity, and the turbulent flow field of the unsteady flow in the low specific speed centrifugal pump was simulated. Hou-lin Liu [12] proposed an improved κ-ω model, which is coupled with the SchnerrSauer cavitation model by ANSYS CFX to predict the cavitation flow in the centrifugal pump.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on hydraulic characteristic of centrifugal pump in plateau

Jiang¹,

Zhang²

2017

IJHT

View full text Add to dashboard Cite

The hydraulic characteristics of a centrifugal pump change when in a plateau, while the corresponding law is unclear. Therefore, experimental research needs to be undertaken on the hydraulic characteristics of a centrifugal pump in a plateau for a quantitative analysis of the changing law. In this paper, the working status of a centrifugal pump in a plateau was simulated by the method of controlling the inlet vacuum so as to acquire the pressure and the flow data under different working conditions. The corresponding conclusions were reached by using thorough data analysis, which shows that with every 500m increase in altitude, the accompanying pump pressure decreased by about 5%-10%, the flow decreased by about 2%-5% and the overall efficiency decreased by about 2%-9%. This theoretical analysis shows that the increase in pump frictional loss is the fundamental reason for the change in the hydraulic characteristics of a centrifugal pump in a plateau.

show abstract

Numerical prediction of 3-D periodic flow unsteadiness in a centrifugal pump under part-load condition

Cited by 32 publications

References 16 publications

Effects of Impeller Diameter on High‐Speed Rescue Pump

Effects of Impeller Diameter on High‐Speed Rescue Pump

Numerical Investigation of Periodic Fluctuations in Energy Efficiency in Centrifugal Pumps at Different Working Points

Experimental research on hydraulic characteristic of centrifugal pump in plateau

Contact Info

Product

Resources

About