Numerical Research of Pump-as-Turbine Performance with Synergy Analysis

Cao, Zheng; Deng, Jianqiang; Zhao, Linkun; Lü, Lin

doi:10.3390/pr9061031

Cited by 11 publications

(9 citation statements)

References 28 publications

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“…When compared to custom-made turbines, pumps offer several advantages, including market availability, lower investment cost, ease of manufacture, and a wide operating range [10]. Unfortunately, selecting and estimating the capacity of a pump for power-generating applications pose challenges in this field [11].…”

Section: Introductionmentioning

confidence: 99%

Selection and Performance Prediction of a Pump as a Turbine for Power Generation Applications

et al. 2023

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The high price of purpose-made turbines always represents an active challenge when utilizing pico- and micro-hydropower resources. Pumps as turbines (PATs) are a promising option to solve the problem. However, the selection of a suitable pump for a specific site and estimating its performance in the reverse mode are both major problems in the field. Therefore, this paper aims to develop generic mathematical correlations between the site and the pump hydraulic data, which can be used to select the optimal operation of the pump as a turbine. A statistical model and the Pearson correlation coefficient formula were employed to generate correlations between the flow rate and the head of the pumps with the sites. Then, Ansys CFX, coupled with SST k-ω and standard k-ε turbulence models, was used to analyze the performance of the PAT. The analysis was conducted in terms of flow rate, pressure head, efficiency, and power output. The numerical results were validated using an experimental test rig. The deviations of the proposed correlations from the statistical model were found to be in the range of −0.2% and 1.5% for the flow rate and ±3.3% for the pressure head. The obtained numerical outputs using the standard k-ε turbulence model strongly agreed with the experimental results, with variations of −1.82%, 2.94%, 2.88%, and 1.76% for the flow rate, head, power, and efficiency, respectively. The shear stress transport (SST) k-ω turbulence model showed relatively higher deviations when compared to standard k-ε. From the results, it can be concluded that the developed mathematical correlations significantly contribute to selecting the optimal operation of the pump for power-generating applications. The adopted numerical procedure, selected mesh type, turbulence model, and physics setup provided good agreement with the test result. Among the two turbulence models, the standard k-ε performs better in estimating the pressure head, output power, and efficiency of the PAT with less than 3% errors when compared to experimental results.

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Section: Introductionmentioning

confidence: 99%

Selection and Performance Prediction of a Pump as a Turbine for Power Generation Applications

et al. 2023

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“…The research results of centrifugal pumps are relatively mature and systematic, while those of PAT are relatively lacking. With the intensification of global climate problems in recent years, PAT has become one of the research hotspots in the field of hydraulic machinery and energy-saving energy storage (Balacco et al, 2021;Cao et al, 2021;El-Emam et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of unsteady pressure pulsation characteristics in an ultra-low specific-speed centrifugal pump as a turbine

et al. 2023

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The unsteady flow characteristics of pump as hydraulic turbine play a vital role in its safe and stable operation, while the ultra-low specific-speed centrifugal pump may face more stability problems due to the limitations of its flow conditions under the turbine working condition. Therefore, in this study, the unsteady characteristics of an ultra-low specific-speed centrifugal pump under turbine conditions are studied using a numerical simulation method, and the numerical simulation is verified using an experimental method. Based on the hydraulic losses of each flow passage component, the energy characteristics of pump as turbine (PAT) are established, and the distribution pattern of total pressure fluctuation in the turbine is studied. The results show that the rotor–stator interaction between the impeller and the tongue makes the hydraulic performance and the internal flow field change periodically. The pressure fluctuation intensities at the tongue, blade inlet edge, and balance hole are large, and the total pressure fluctuation in the three areas is intense in space and time. The internal flow characteristics at typical blade positions show that the secondary flow phenomena such as separation flow and wake flow near the tongue make the pressure gradient larger, which is an important influence mode of the rotor–stator interaction. This study provides a reference and guidance for the unsteady study of low specific-speed PAT.

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“…Also, the results showed that the suction side of the leading edge of the blade is exposed to a lower static pressure where cavitation may occur when the back pressure of the PAT is lower than it is. 5 Maleki et al presented outcomes of their numerical investigation into the impact of viscosity on hydraulic characteristics in single-stage and multistage PAT, working in different loading conditions. Extracted characteristic curves and flow patterns for five different viscous fluids, working in turbine mode, reveal that the turbine head is affected by increasing viscosity which contributes to the reduction of hydraulic efficiency, specifically at part load flow rates.…”

Section: Introductionmentioning

confidence: 99%

“…As the flow rate is increased in reverse mode, the head and torque increase too. Also, the results showed that the suction side of the leading edge of the blade is exposed to a lower static pressure where cavitation may occur when the back pressure of the PAT is lower than it is 5 . Maleki et al presented outcomes of their numerical investigation into the impact of viscosity on hydraulic characteristics in single‐stage and multistage PAT, working in different loading conditions.…”

Section: Introductionmentioning

confidence: 99%

An experimental and numerical investigation into using hydropower plant on oil transmission lines

Ansari

Aligholami

Khosroshahi

2022

Energy Science & Engineering

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Replacing control valves in the inlet lines of oil transmission stations with hydropower plants can be a logical solution to convert energy losses into useful power. In this regard, this paper carried out an experimental and numerical investigation to study the feasibility of applying a pump as turbine in a hydropower system and its performance on the oil transmission lines. An experimental platform, comprising a tank, hydropower, centrifugal pump, electromotor, and measuring instruments, was constructed. An external gear pump was employed regarding the high working pressure of the system, maximally 80 bar, as an actuator of the centrifugal pump. By comparing the efficiency of the electropump with the hydropower-driven pump, it was observed that maximum efficiency, approximately 20.6%, occurred when the pump reached its best efficiency point. Furthermore, based on experiments on hydropower-driven pump under different inlet pressures, an optimal point was observed for the system. This issue enhanced the system's efficiency by 19% as the flow rate increased by 1.9 L/s in the inlet pressure of 80 bar. According to the results, as the flow rate increases, there is a descending trend in outlet pressure. Besides this, there is an optimum condition for the maximum efficiency of hydropower plants and this crucial point should be determined by experimental or numerical studies to reach maximum performance. Furthermore, extracted values of power from the computational fluid dynamics model were compared with the experiments with less than 8% error in most cases. Therefore, a correlation was introduced for the prediction of power based on effective parameters of outlet pressure and volumetric flow rate for the off-design condition in each inlet pressure with roughly 2% error.

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Numerical Research of Pump-as-Turbine Performance with Synergy Analysis

Cited by 11 publications

References 28 publications

Selection and Performance Prediction of a Pump as a Turbine for Power Generation Applications

Selection and Performance Prediction of a Pump as a Turbine for Power Generation Applications

Numerical investigation of unsteady pressure pulsation characteristics in an ultra-low specific-speed centrifugal pump as a turbine

An experimental and numerical investigation into using hydropower plant on oil transmission lines

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