Internal hydraulic analysis of impeller rounding in centrifugal pumps as turbines

Singh, Punit; Nestmann, Franz

doi:10.1016/j.expthermflusci.2010.08.013

Cited by 121 publications

(66 citation statements)

References 6 publications

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“…Therefore, researchers have been focused on its efficiency improvement. Singh and Nestmann [6,7] carried various possibilities of modifying current pump geometry to improve its efficiency. Yang et al analyzed the flow field [8] within PAT and investigated effects of splitter blades [9] and blade wrap angle [10] on the performance influence of PAT.…”

Section: Introductionmentioning

confidence: 99%

Research on Blade Thickness Influencing Pump as Turbine

Yang

Wang

Chen

et al. 2014

Advances in Mechanical Engineering

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Research on the efficiency improvement of pump as turbine (PAT) is inadequate. Blade thickness is an important geometry parameter in blade design. To explore effects of blade thickness on the influence of PAT, numerical research on three different specific speeds of PATs with different blade thickness was carried out. Their performance changes with blade thickness were presented. Besides, the variations of hydraulic loss distribution with increasing blade thickness were performed. Theoretical analysis gives a reasonable explanation for the performance change. Results show that PAT's flow versus efficiency curve ( -) is lowered; flow versus head ( -) curve and flow versus power ( -) curve are increased with increasing blade thickness. The increase of -is mainly attributed to the increase of theoretical head caused by increasing blockage of impeller inlet area. Hydraulic loss distribution analysis indicates that the total hydraulic loss within PAT is increased with increasing blade thickness. The increase of -curve is a combined effect of the increase in theoretical head and the total hydraulic loss. The decrease of efficiency with increasing blade thickness indicates that the blade thickness of PAT should be as thin as possible if its strength could be met.

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Section: Introductionmentioning

confidence: 99%

Research on Blade Thickness Influencing Pump as Turbine

Yang

Wang

Chen

et al. 2014

Advances in Mechanical Engineering

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“…The flow rate and head for each PAT were generated by a proper pump in the experimental setup. Punit Singh et al [6] : studied the effects of impeller rounding on a combinatio n of radial flow and mixed flow pumps as turbines using experimental data. The impeller rounding is seen to have positive impact on the overall efficiency in different operating regions with an improvement in the range of 1-3%.…”

Section: Pump Running In Turbine Modementioning

confidence: 99%

CFD Analysis and Modification of Open Well Centrifugal Pump : A Review

2014

IJAERD

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Abstract:The centrifugal pump is the most used pump type in the world. The flow analysis inside the centrifugal pump is highly complex mainly due to 3D flow structure involving turbulence, secondary flow, cavitation and unsteadiness. In recent years, a growing availability of computational resources and progress in the accuracy of numerical methods brought turbo machinery Computational Fluid Dynamics (CFD) methods from pure research work into the competitive industrial markets. The critical review of CFD analysis of centrifugal pumps along with the future scopes for further improvement is presented in this paper. CFD technique has been applied by the researchers to carry out different investigations on centrifugal pumps viz. performance prediction at design and off-design conditions, parametric study, cavitation analysis, diffuser pump analysis, performance of pump running in turbine mode etc. Unsteady Reynolds-averaged Navier-Stokes equations together with two equation k-ε turbulence model were found to be appropriate for CFD analysis of centrifugal pump. Volute flow study and impeller-volute interaction appeared as an interesting research fields for the further improvement in the pump performance. The most active areas of research and development are the analysis of two phase flow, pump handling non-Newtonian fluids and fluid-structure interaction.

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“…The impeller diameter is a crucial design parameter because it can easily affect the performance of pumps [20][21][22][23]. Jain et al [24] proposed an empirical correlation to predict the efficiency of pump impellers that run in turbine mode.…”

Section: Prefacementioning

confidence: 99%

Effects of Impeller Diameter on High‐Speed Rescue Pump

Bai

Kong

Xia

et al. 2017

Mathematical Problems in Engineering

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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 ...

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Internal hydraulic analysis of impeller rounding in centrifugal pumps as turbines

Cited by 121 publications

References 6 publications

Research on Blade Thickness Influencing Pump as Turbine

Research on Blade Thickness Influencing Pump as Turbine

CFD Analysis and Modification of Open Well Centrifugal Pump : A Review

Effects of Impeller Diameter on High‐Speed Rescue Pump

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