Experimental study of the effect of blade tip clearance and blade angle error on the performance of mixed-flow pump

Hao, Bing; Cao, Shuai; He, Chenglian; Lü, Li

doi:10.1007/s11431-012-5080-6

Cited by 25 publications

(14 citation statements)

References 11 publications

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“…Liu et al [13] studied a mixed-flow pump through numerical simulation and determined the following: (1) the head and efficiency were considerably affected by the shape and parameters of tip clearance, and (2) the reduction of efficiency was almost linear with the change of tip clearance under design conditions. Bing et al [14] and Zhang et al [15] obtained the same findings and further determined that the slope increased with flow rate. Jia et al [16] investigated a low-specific speed of the semi-open centrifugal pump and discovered that external characteristics substantially decreased with the increase of tip clearance height, but the hump phenomenon in small flow conditions weakened.…”

Section: Introductionsupporting

confidence: 52%

Numerical Simulation of the Tip Leakage Vortex Characteristics in a Semi-Open Centrifugal Pump

et al. 2019

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Tip leakage vortex has an important influence on the performance of semi-open centrifugal pumps. Simulations based on the three-dimensional Reynolds-Averaged Navier–Stokes were conducted to study the structural characteristics of tip leakage vortex and its effects on the internal flow field, and the Shear Stress Transport k-ω turbulence model was used to simulate the whole flow passage of centrifugal pumps with tip clearances of 0 mm and 1 mm. Then, the tip leakage vortex was analyzed using the relative vorticity transport equation. The numerical data and experimental results agreed well. The leakage vortex formed in the tip clearance led to 18.7% and 14.4% decrease in head and efficiency under design condition, respectively, and the bigger the flow rate, the fast the performance decreased. Tip leakage vortex formed at the leading edge of the blade moved along the suction surface. Whereas the tip leakage vortex formed near the middle of the blade extended to the pressure surface of the adjacent blade. This phenomenon deteriorated the flow field and induced passage vortex, thereby reducing the static pressure and blade load and changing the static pressure distribution law. The formation and development of leakage vortex could be attributed to the relative vortex stretching the term. The Coriolis force term could reflect the change of vorticity caused by leakage flow, and the viscous diffusion term served as the vorticity source.

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Section: Introductionsupporting

confidence: 52%

Numerical Simulation of the Tip Leakage Vortex Characteristics in a Semi-Open Centrifugal Pump

et al. 2019

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“…It is unknown whether the pump selected satisfies the requirement of designed flow rate and run in high efficiency zone. Numerical analysis is often applied to check its feasibility and reasonableness, referring to [17][18][19][20][21].…”

Section: Three-dimensional Modeling Of the Pumping Systemmentioning

confidence: 99%

Pump Selection and Performance Prediction for the Technical Innovation of an Axial-Flow Pump Station

Zhu

Zhou

et al. 2018

Mathematical Problems in Engineering

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Axial-flow pumps are widely used in every sector of China. After many years of operation, the aging of mechanical and electrical facilities poses threats to their steady and safe operation. Taking the technical innovation of an axial-flow pump station as an example, the study is focused on the pump selection and performance prediction. The pump similarity law and specific speed were applied to guide the pump selection based on the designed head and discharge. The performances of pump models were compared and it is suggested for the technical innovation that when the selected model pump is adopted, the impeller diameter is kept at 3100 mm and the rotational speed is reduced from 150r/min to 136.4r/min to improve its cavitation performance. A threedimensional pumping system model was established by using software Pro/E and CFD analyses were conducted to predict the hydraulic performance of the pumping system for the evaluation of technical innovation. It is shown through the comparison of computed results with model test results that the designed flow rate corresponding to the designed head can be fully satisfied with the selected pump and stronger pumping capacity can be prospected at the designed and mean lifting head. The pumping system model tests, in comparison between the original and the selected model pump, indicate that when the innovated pump station operates under characteristic heads, the pumping system efficiency can be raised by more than 3 percentages, and the cavitation allowance can be decreased by 0.90m; thus, better engineering and economic benefits can be prospected through the technical innovation.

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“…Much research has been carried out in the aspects of the blade tip gap effects on energy performance and TLV for hydraulic machinery. For the aspect of energy performance, Bing et al [10] found that the external characteristics of a mixed-flow pump decreased with the tip clearance increase by the experimental method. Similarly, Bing et al [11] conducted the hydraulic performance test of a mixed-flow pump with different blade tip clearances and various blade angle errors and proved that the efficiency, the head, and the shaft power of the mixed-flow pump all decrease with the increase of the blade tip clearance under any flow rate.…”

Section: Introductionmentioning

confidence: 99%

A Method of Bending Shrinkage Groove on Vortex Suppression and Energy Improvement for a Hydrofoil with Tip Gap

Huang

et al. 2020

Processes

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Hydro energy is a kind of typical renewable energy, which can be converted by hydraulic machinery. However, tip leakage vortex (TLV) has a significant negative influence on the flow pattern and energy performance of hydraulic machinery. In this paper, a bending shrinkage groove (BSG) is proposed to suppress the TLV and improve the energy performance of a hydrofoil first, and then a parametric optimization design method is briefly introduced and applied to determine the optimal configuration of the groove. The main geometric parameters of the groove are selected as optimized variables and three different groove configurations are selected from the optimization result. Finally, the performance improvement of the hydrofoil with groove, the sensitivity analysis of the optimization variables, and the groove impacts on the TLV and flow patterns are investigated. The results demonstrate that the preferred groove reduces the non-dimensional Q criterion vortex isosurfaces area (Qarea = 2 × 107) by 5.13% and increases the lift drag ratio by 17.02%, comparing to the origin hydrofoil. Groove depth d and groove width w are proved to have more significant impacts on the hydrofoil energy performance. The TLV and flow patterns are greatly affected by the different BSG configurations, and the wider BSG contributed to reducing the area of TLV, at the cost of energy performance deterioration.

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Experimental study of the effect of blade tip clearance and blade angle error on the performance of mixed-flow pump

Cited by 25 publications

References 11 publications

Numerical Simulation of the Tip Leakage Vortex Characteristics in a Semi-Open Centrifugal Pump

Numerical Simulation of the Tip Leakage Vortex Characteristics in a Semi-Open Centrifugal Pump

Pump Selection and Performance Prediction for the Technical Innovation of an Axial-Flow Pump Station

A Method of Bending Shrinkage Groove on Vortex Suppression and Energy Improvement for a Hydrofoil with Tip Gap

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