Study on improvement of hydraulic performance and internal flow pattern of the axial flow pump by groove flow control technology

Mu, Tong; Zhang, Rui; Xu, Hui; Zheng, Yuan; Fei, Zhaodan; Li, Jinghong

doi:10.1016/j.renene.2020.06.145

Cited by 34 publications

(20 citation statements)

References 15 publications

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“…They noticed that suppressing the growth of vortices at the diffuser inlet was key to improving the positive slope of the flow vs. head curve. Mu et al [8] proposed a new control technology for the groove flow to improve the hydraulic performance of an axial-flow pump when a rotating stall occurs under slow flow conditions. They found that adding an axial groove improved the separation flow on the impeller blade surface and suppressed the generation of vortices in the flow pipeline.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis of Transient Flow Field and Pressure Pulsations of an Axial-Flow Pump Considering the Pump–Pipeline Interaction

Yang

et al. 2022

JMSE

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The internal flow in a vertical axial-flow pump is a complex unsteady three-dimensional viscous flow. An unstable flow often produces complex flow phenomena such as flow separation, vortices, and secondary reflux, which reduces the operating efficiency of the pump and can endanger safety and stability. In this paper, computational fluid dynamics is used to calculate the flow characteristics in an axial-flow pump using the shear stress transport and curvature correction (SST-CC) model for turbulence modified to account for the rotational curvature. Furthermore, the dependability of the numerical results was confirmed by a test with an actual model of a pump. The transient deviation angle at the impeller inlet of the pump, the stream field attributes in various spanwise parts of the impeller and guide vane, and the velocity distributions at the impeller inlet and outlet were analyzed. The omega method was utilized to recognize the vortex structure inside the guide vane. Moreover, the development of the transient vortex structure inside the guide vane was studied. As the flow rate increased, the scale and turbulent kinetic energy of the vortex structure gradually decreased. The time-domain graph for the impeller inlet is clearly periodic, with three peaks and three troughs in an impeller rotational period. The dominant frequency in the spectrum at each monitoring point was basically the blade frequency, and the secondary dominant frequency was twice the blade frequency.

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Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis of Transient Flow Field and Pressure Pulsations of an Axial-Flow Pump Considering the Pump–Pipeline Interaction

Yang

et al. 2022

JMSE

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“…In this context, pumps can be radial, mixed, or axial flow. Axial flow pumps are designed to provide a higher flow rate at a low head [14], mainly applicable in low mountainous areas, irrigation, flood control, and water detour [15]. However, manufacturers do not provide the characteristic curve when purchasing a centrifugal pump if it is operated in turbine mode for hydroelectric power generation [16].…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Commercial Axial Flow PAT Through a Structured Methodology Step-by-Step

Vásquez

Graciano-Uribe

Torres

2022

CFDL

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A centrifugal pump as a turbine (PAT) is the inverse operation of a conventional pump, which takes advantage of the hydraulic energy of water to convert it into rotational mechanical energy and subsequently into electrical energy, through a generator. The CFD analysis allows predicting the fluid dynamic behavior and calculating the operating characteristic curve of the PAT, thus reducing costs in experimental setups. In the literature, the operation of the turbomachine in pump and turbine mode is evidenced. However, there is no methodology applied in commercial axial flow pumps that exposes a structured step-by-step to carry out the numerical and fluid dynamic analysis. In this study, a novel structured methodology is developed describing the numerical and CFD analysis of a commercial axial flow centrifugal pump, which allows validating the characteristic curve in pump mode and then obtaining the site conditions in turbine mode, for its application in small hydroelectric power plants. As a result, in pump mode, an error of less than 8% is obtained between the manufacturer's curve and the numerical curve. In turbine mode, the best performance is around 73%. The aim is to propose a replicable algorithm in future works that allows the proper analysis in commercial axial flow pumps.

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“…Feng [9] has adopted the axial slotting method for improving the hump instability in axial-flow pumps and it is pointed out that the best improvement can be achieved when the ratio of groove depth to impeller diameter is 0.22. Mou and Zhang [10] proposed a new type of axial grooves in a typical axial-flow pump and by compared with the diagonal grooves, the proposed axial grooves can effectively improve the inflow flow pattern of the axial-flow pumps while avoiding energy loss.…”

Section: Introductionmentioning

confidence: 99%

Optimization design of the groove flow control technique to suppress flow instability in axial-flow pump

Zhang

2022

J. Phys.: Conf. Ser.

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As an effective fluid control technology, the groove flow control technique is used to improve axial-flow pump energy performance. Determining the values of groove parameters reasonably is essential to maximize the energy performance of axial-flow pumps. In order to solve the limitation of traditional groove design in groove flow control technology, this paper presents a multi-objective groove optimization method developed by integrating OD (orthogonal design), RSM (response surface methodology), and PSO (particle swarm optimization). A case study of an axial-flow pump is conducted. By using the OD method, the sample space has been designed. The performance prediction model of axial flow pump is established by RSM. In addition, the linear weighted method is employed to construct a comprehensive evaluation function as the fitness value of PSO. Finally, an optimal combination of the groove flow control technique parameters is determined using the PSO algorithm. The result shows that this method proposed in this paper is helpful for solving multi-objective optimization of the groove flow control technique and could effectively improve the hydraulic performance of the axial-flow pump under three typical stall conditions. The optimization effectively suppresses the formation of a saddle zone. In addition, the optimization increases the pump head by 0.30, 4.41 and 9.70 m under the critical stall condition, moderate stall condition and deep stall condition, respectively. Moreover, the optimization leads to better inflow conditions for the impeller and enhances its performance under the stall conditions. This study provides a basis for the early-stage design of the groove flow control technique for axial-flow pump and provides a valuable reference for the optimal design of groove for other fluid machineries.

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Study on improvement of hydraulic performance and internal flow pattern of the axial flow pump by groove flow control technology

Cited by 34 publications

References 15 publications

Numerical and Experimental Analysis of Transient Flow Field and Pressure Pulsations of an Axial-Flow Pump Considering the Pump–Pipeline Interaction

Numerical and Experimental Analysis of Transient Flow Field and Pressure Pulsations of an Axial-Flow Pump Considering the Pump–Pipeline Interaction

Characterization of a Commercial Axial Flow PAT Through a Structured Methodology Step-by-Step

Optimization design of the groove flow control technique to suppress flow instability in axial-flow pump

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