A Hybrid Model Based on the Bifurcation Approach for Internal Turbulent Flow with Rotation and Streamline Curvature Effects

Pang, Kaiwen; Huang, Xianbei; Liu, Zhuqing; Li, Yaojun; Yang, Wei

doi:10.3390/jmse10122022

Cited by 3 publications

(2 citation statements)

References 52 publications

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“…Therefore, it should incorporate the rotation effect into the unsteady RANS (URANS) model [37][38][39][40]. There are several methods [40][41][42][43][44][45][46][47][48][49][50] to incorporate the rotation effect into the URANS model. Through verification by many scholars [38][39][40][41], the bifurcation approach is the more accurate.…”

Section: Introductionmentioning

confidence: 99%

“…There are several methods [40][41][42][43][44][45][46][47][48][49][50] to incorporate the rotation effect into the URANS model. Through verification by many scholars [38][39][40][41], the bifurcation approach is the more accurate. Therefore, using the URANS model with the bifurcation approach is feasible to simulate the flow field in fluid machinery.…”

Section: Introductionmentioning

confidence: 99%

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Critical State Calculation of Saddle-Shaped Unstable Region of the Axial-Flow Pump Based on Bifurcation SST k–ω Model

Pang

Huang

Yan

et al. 2023

JMSE

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This study aims to investigate the critical state of the saddle-shaped unstable region of the axial-flow pump and propose a suitable criterion for identifying this state. The bifurcation SST k–ω model considered the rotation effect is used in the present work and verified in the numerical calculation of a water jet pump. Then, it is used to simulate the critical state of the axial-flow pump. Results show that the leading-edge separation vortex generates at 0.6Qd, while the head declines only at 0.55Qd. Therefore, using the inflection point of the head-flow curve as the critical state criterion is unsuitable. In addition, the fixed monitoring point is unsuitable for identifying the critical state due to the insensitivity to the amplitude, main frequency, and periodicity changes at the critical state. Finally, to identify the critical state, it is essential to arrange a monitoring point at the leading edge of the blade suction near the shroud, which should rotate with the impeller. The critical state criterion is that the main frequency position of the pressure fluctuation signal is offset at the monitoring point, and the amplitude is increased by 10 times.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Critical State Calculation of Saddle-Shaped Unstable Region of the Axial-Flow Pump Based on Bifurcation SST k–ω Model

Pang

Huang

Yan

et al. 2023

JMSE

Self Cite

View full text Add to dashboard Cite

show abstract

Numerical simulation of turbulent Taylor–Couette flow with high Taylor number and large radius ratio in high-speed canned motor pump internals

Zhang,

Xu,

Song

et al. 2024

Physics of Fluids

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Taylor–Couette flow with a high Taylor number and large radius ratio is widely present in fluid machinery, such as the internal clearance flow in a canned motor pump typically. Taylor–Couette flow with radius ratios from 0.934 to 0.977 and Taylor number from 107 to 1010 was investigated by numerical simulations. The results indicated that torque is positively correlated to radius ratio, while dimensionless torque is exponentially related to the Taylor number. Subsequently, the physical characteristics of the flow field were described by extracting statistical quantities such as the average azimuthal velocity profile, velocity fluctuations, and near-wall region analysis at four internal cylinder rotation frequencies and four radius ratios. The results revealed that increasing rotation frequency would increase velocity gradients near the wall, while higher radius ratios would produce more uniform velocity fluctuation distributions. In addition, near-wall profiles showed a constant shear force layer, while the logarithmic layer was affected by rotation frequency and radius ratio. The detailed analysis revealed that as the rotation frequency increased, the flow gradually transitioned to a turbulent state, intensifying the interaction between large and small vortex structures. The rotation speeds of Taylor vortices remained consistent across different radius ratios, with smaller scales and more numerous vortices observed at larger ratios. Smaller radius ratios led to more fine-scale vortex structures near the cylindrical wall, significantly impacting azimuthal velocity fluctuations. Finally, near-wall velocity streaks are presented to demonstrate their periodic nature and the relationship between high-speed and low-speed regions, as well as their interaction with the wall and changes with distance.

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Study on Turbulent Taylor-Couette Flow with High Reynolds Number and Large Radius Ratio in High-Speed Canned Motor Pump Internals

Zhang,

He,

et al. 2024

J. Phys.: Conf. Ser.

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The Taylor-Couette flow, a prevalent flow pattern in fluid machinery. This study investigates turbulent Taylor-Couette flow within the internal flow of a shield pump through numerical simulations. The study encompasses a range of radius ratios (0.934 to 0.977) and inner cylinder frequencies (50 to 383 Hz). Our findings reveal a significant positive correlation between torque magnitude and radius ratio within the studied parameter range. Additionally, an exponential relationship between non-dimensional torque and Taylor number was identified through fitting. Moreover, the study elucidates that larger radius ratios lead to an earlier transition to the final turbulent region with increasing Taylor numbers. Furthermore, detailed analysis of the flow field vortex structure demonstrates the profound influence of radius ratio on the number of Taylor vortices.

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A Hybrid Model Based on the Bifurcation Approach for Internal Turbulent Flow with Rotation and Streamline Curvature Effects

Abstract: This study aims to research the prediction performance of a bifurcated adaptive DDES (BADDES) model in different turbulent flows with rotation and curvature [...]

Cited by 3 publications

References 52 publications

Critical State Calculation of Saddle-Shaped Unstable Region of the Axial-Flow Pump Based on Bifurcation SST k–ω Model

Critical State Calculation of Saddle-Shaped Unstable Region of the Axial-Flow Pump Based on Bifurcation SST k–ω Model

Numerical simulation of turbulent Taylor–Couette flow with high Taylor number and large radius ratio in high-speed canned motor pump internals

Study on Turbulent Taylor-Couette Flow with High Reynolds Number and Large Radius Ratio in High-Speed Canned Motor Pump Internals

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