Numerical simulation and experimental investigation on the influence of the clocking effect on the hydraulic performance of the centrifugal pump as turbine

Guan, Hongtao; Jiang, Wei; Wang, Yuchuan; Tian, Hui; Li, Ting; Chen, Diyi

doi:10.1016/j.renene.2020.12.030

Cited by 30 publications

(18 citation statements)

References 39 publications

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“…4(e)-(h), respectively). The non-uniform pressure contours at the rotor-stator interaction zone lead to the extreme pressure pulsation, unsteady forces, and shock losses with vibration in the impeller [25]. Overall, a more uniform flow is observed at the optimized pump's design and off-design condition than the base pump.…”

Section: Results Of Numerical Simulationmentioning

confidence: 97%

Optimization of Centrifugal Pump Based on Impeller-Volute Interactions

Shah

Baloni

Channiwala

2022

Adv. technol. innov.

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The design and off-design performance of a centrifugal pump largely depends on geomechanical parameters. This study aims at enhancing the performance by optimizing three geomechanical parameters of impeller-volute interactions. The present optimization is carried out using the Taguchi method combined with a numerical approach. A comparison between the base and optimized pumps is presented under the design and off-design conditions based on numerical and experimental analyses. The numerical results reveal that, compared to the base pump, the optimized pump shows the improved performance through uniform pressure distribution in the impeller, the reduced low-pressure region towards a blade’s leading edge, and the stable total pressure at the impeller-volute interaction zone. The experimental results suggest that the optimized pump covers a wider range of operation, and its best efficiency point (BEP) is 10%, 5%, and 12% higher in flow rate, head, and efficiency, as compared to the base one.

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Section: Results Of Numerical Simulationmentioning

confidence: 97%

Optimization of Centrifugal Pump Based on Impeller-Volute Interactions

Shah

Baloni

Channiwala

2022

Adv. technol. innov.

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“…As expected, unsteady flow phenomena such as the backflows, shock flows, and vortical flows, have inflicted higher entropy and energy dissipation, where flow zones with the highest energy losses have been pointed out as the vicinities of the blade leading edge, the cavity zone (impeller's back and front chambers), and volute throat. In the same respect, Guan et al [31] and Morabito et al [32] found that the position and geometry of the volute throat may influence the machine energy loss characteristics and its efficiency.…”

Section: Introductionmentioning

confidence: 96%

A Numerical Investigation into the PAT Hydrodynamic Response to Impeller Rotational Speed Variation

et al. 2021

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The utilization of pump as turbines (PATs) within water distribution systems for energy regulation and hydroelectricity generation purposes has increasingly attracted the energy field players’ attention. However, its power production efficiency still faces difficulties due to PAT’s lack of flow control ability in such dynamic systems. This has eventually led to the introduction of the so-called “variable operating strategy” or VOS, where the impeller rotational speed may be controlled to satisfy the system-required flow conditions. Taking from these grounds, this study numerically investigates PAT eventual flow structures formation mechanism, especially when subjected to varying impeller rotational speed. CFD-backed numerical simulations were conducted on PAT flow under four operating conditions (1.00 QBEP, 0.82 QBEP, 0.74 QBEP, and 0.55 QBEP), considering five impeller rotational speeds (110 rpm, 130 rpm, 150 rpm, 170 rpm, and 190 rpm). Study results have shown that both PAT’s flow and pressure fields deteriorate with the machine influx decrease, where the impeller rotational speed increase is found to alleviate PAT pressure pulsation levels under high-flow operating conditions, while it worsens them under part-load conditions. This study’s results add value to a thorough understanding of PAT flow dynamics, which, in a long run, contributes to the solution of the so-far existent technical issues.

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“…By considering the relationship between turbulent dissipation, wall dissipation and blade thickness on total entropy production under stall conditions, the source of impeller domain loss was identified, which laid a foundation for the optimization of mixed flow pump. Gu et al [ 8 ] studied the influence of the clock effect on the flow field and water loss in the pump when the pump as a turbine (PAT) and explored the change of internal energy loss of PAT under different guide vanes. Ghorani et al [ 9 ] revealed the distribution of PAT hydraulic loss and found that the energy dissipation in the conduit accounted for more than 50%, and the main energy loss from EPTD accounted for 86.89–90.98%.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Energy Loss Characteristics of Vertical Axial Flow Pump Based on Entropy Production Method under Partial Conditions

Yang

Chang

Cai³

et al. 2022

Entropy

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The energy loss of the vertical axial flow pump device increases due to the unstable internal flow, which reduces the efficiency of the pump device and increases its energy consumption of the pump device. The research results of the flow loss characteristics of the total internal conduit are still unclear. Therefore, to show the internal energy loss mechanism of the axial flow pump, this paper used the entropy production method to calculate the energy loss of the total conduit of the pump device to clarify the internal energy loss mechanism of the pump device. The results show that the energy loss of the impeller is the largest under various flow conditions, accounting for more than 40% of the total energy loss of the pump device. The variation trend of the volume average entropy production and the energy loss is similar under various flow coefficients (KQ). The volume average entropy production rate (EPR) and the energy loss decrease first and then increase with the increase of flow, the minimum volume average entropy production is 378,000 W/m3 at KQ = 0.52, and the area average EPR of the impeller increases gradually with the increase of flow. Under various flow coefficient KQ, the energy loss of campaniform inlet conduit is the smallest, accounting for less than 1% of the total energy loss. Its maximum value is 63.58 W. The energy loss of the guide vane and elbow increases with the increase of flow coefficient KQ, and the maximum ratio of energy loss to the total energy loss of the pump device is 29% and 21%, respectively, at small flow condition KQ = 0.38. The energy loss of straight outlet conduit reduces first and then increases with the increase of flow coefficient KQ. When flow coefficient KQ = 0.62, it accounts for 27% of the total energy loss of the pump device, but its area average entropy production rate (EPR) and volume average entropy production rate (EPR) are small. The main entropy production loss in the pump device is dominated by entropy production by turbulent dissipation (EPTD), and the proportion of entropy production by direct dissipation (EPDD) is the smallest.

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Numerical simulation and experimental investigation on the influence of the clocking effect on the hydraulic performance of the centrifugal pump as turbine

Cited by 30 publications

References 39 publications

Optimization of Centrifugal Pump Based on Impeller-Volute Interactions

Optimization of Centrifugal Pump Based on Impeller-Volute Interactions

A Numerical Investigation into the PAT Hydrodynamic Response to Impeller Rotational Speed Variation

Analysis of Energy Loss Characteristics of Vertical Axial Flow Pump Based on Entropy Production Method under Partial Conditions

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