Investigation of energy dissipation mechanism and the influence of vortical structures in a high-power double-suction centrifugal pump

Deng, Qifan; Pei, Ji; Wang, Yiyun; Sun, Ju

doi:10.1063/5.0157770

Cited by 10 publications

(1 citation statement)

References 41 publications

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“…In summary, Case C exhibits the highest vorticity, while Case A has the lowest. The generation of vortices is frequently coupled with turbulence, leading to turbulence losses (Deng et al, 2023;Kan et al, 2023). Furthermore, the vortex introduces additional resistance and increases flow friction, contributing to reduced efficiency.…”

Section: Analysis Of Vorticitymentioning

confidence: 99%

Influences of suction pipe structures on hydraulic performance and internal flow of electric coolant pumps

Yang,

Gu,

Cheng

et al. 2024

Front. Energy Res.

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An electric coolant pump (ECP) serves as a critical component in the thermal management of electric vehicles. To fulfill the requirements of pressurizing and circulating coolant for various components, a complex structure with multiple pipes is integrated into the pump inlet. This study focuses on the design and analysis of three suction pipe structures: a straight pipe (Case A), a bend (Case B), and a combination of a bend with manifolds (Case C). The objective of this study is to explore the impacts of suction pipe structures on the hydraulic performance, flow pattern, temperature distribution, and vorticity of ECP. Taking into account the variability of coolant physical parameters with temperature, ECP is numerically simulated using the unsteady Reynolds-averaged Navier–Stokes (RANS) equation and the shear stress transport k–ω turbulence model. The experimental and numerical results exhibit good agreement. Case A demonstrates the highest efficiency, Case B follows as the second most efficient, and Case C displays the lowest efficiency. However, the pressure rise remains essentially consistent in all cases. The average efficiencies of Cases B and C are 1.18% and 2.13% lower than that of Case A. The temperature of ECP increases with an increase in the coolant temperature. The temperature of the printed circuit board (PCB) surpasses that of the motor. Case A exhibits the most favorable flow pattern, while Case C demonstrates the least favorable. The bend introduces secondary flow, further intensified by the manifold, leading to an increase in vorticity. The high-vorticity zones expand as the flow rate increases. This study offers valuable insights into the optimization of the ECP suction pipe structure.

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Section: Analysis Of Vorticitymentioning

confidence: 99%

Influences of suction pipe structures on hydraulic performance and internal flow of electric coolant pumps

Yang,

Gu,

Cheng

et al. 2024

Front. Energy Res.

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Transient numerical investigation on hydraulic performance and flow field of multi-stage centrifugal pump with floating impellers under sealing gasket damage condition

Gu,

Bian,

Wang

et al. 2023

Physics of Fluids

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Multi-stage centrifugal pumps with floating impellers provide a convenient means of adjustment to meet diverse head requirements. These pumps utilize sealing gaskets to minimize leakage losses and restrict impeller axial motion. However, the impact of sealing gasket breakage on hydraulic performance and internal flow remains uncertain. To investigate this, a novel dynamic mesh simulation method is proposed to enable simultaneous axial motion and rotation of the impeller. Validation of numerical simulations with experiments is performed. Transient hydraulic performance is influenced by impeller axial motion, with a lagging flow field response. Head coefficient and efficiency curves exhibit asymmetric triangular functions with higher fluctuations compared to impeller with fixed axial position. At the design condition, with the impeller floating, the head coefficient ranges from 0.7 to 1.9, while the efficiency ranges from 29.7% to 60.1%. Among the various loss ratios, the hydraulic loss ratio exhibits the highest magnitude, followed by the leakage loss ratio, with the shroud friction loss ratio being the smallest. Entropy production reveals the significant influence of impeller oscillation on local flow loss. The axial motion of the impeller causes drastic velocity and pressure fluctuations in both time and space.

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Asymmetric flow in a double-suction centrifugal fan induced by an inclined impeller

Chen,

He,

Yang

et al. 2024

Physics of Fluids

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The impeller and volute of a centrifugal fan are designed to be coaxially placed; however, the impeller might be inclined about the central axis of the volute due to installation fault, inducing asymmetric flow in the left and right halves of the fan. We performed a detailed numerical investigation on the non-uniform and asymmetric flow in a double-suction multi-blade centrifugal fan with a slightly inclined impeller using the unsteady Reynolds-averaged Navier–Stokes simulation approach. The impeller is assumed to rotate about each of the two minor axes perpendicular to the central axis to model the inclination. This work aims to quantify the influence of the impeller inclination on the aerodynamic performance of the centrifugal fan and to reveal the physics of transient flow in the two halves of the fan to demonstrate the impact of various inclination ways. Numerical results denote that a slight impeller inclination could stabilize the flow in the fan, while the flow is highly asymmetric as the inclination is enhanced, and the efficiency of the fan decreases due to the recirculation generated by the interaction of flow exiting from the impeller. An in-depth inspection shows sharply intensified pressure fluctuation at the collector, where the local clearance varies. The flow entering the collector and impeller substantially decreases in velocity, resulting in separated flow in part of the blade passages. The flow in the volute is also asymmetric since the impeller outlet is biased toward the volute wall.

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Investigation of energy dissipation mechanism and the influence of vortical structures in a high-power double-suction centrifugal pump

Cited by 10 publications

References 41 publications

Influences of suction pipe structures on hydraulic performance and internal flow of electric coolant pumps

Influences of suction pipe structures on hydraulic performance and internal flow of electric coolant pumps

Transient numerical investigation on hydraulic performance and flow field of multi-stage centrifugal pump with floating impellers under sealing gasket damage condition

Asymmetric flow in a double-suction centrifugal fan induced by an inclined impeller

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