The effects of the rotor-stator interaction on unsteady pressure pulsation and radial force in a centrifugal pump

Chalghoum, Issa; Elaoud, Sami; Kanfoudi, Hatem; Akrout, Mohsen

doi:10.1007/s42241-018-0073-y

Cited by 54 publications

(32 citation statements)

References 16 publications

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“…Rotor–stator interaction has a significant effect on pressure and radial force variations in pumps; 12,13 therefore, the sliding mesh method, rather than multiple reference frames, is employed to incorporate the impeller rotation. A 5 × 10 −5 s time step is adopted, which corresponds to 1.02° rotation per time step at 3400 r/min.…”

Section: Materials and Methodologymentioning

confidence: 99%

“…The rotor–stator interaction can result in pressure fluctuations and dynamic forces. Many studies have investigated this subject, 12,13 focusing mainly on the effect of rotor–stator interaction at different flow rates. In this article, we correlate the pressure head with the axial torques, efficiency, and radial and axial thrust forces.…”

Section: Introductionmentioning

confidence: 99%

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Impeller (straight blade) design variations and their influence on the performance of a centrifugal blood pump

Fang

Yu³

2020

Int J Artif Organs

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Introduction: The miniaturization of blood pumps has become a trend due to the advantage of easier transplantation, especially for pediatric patients. In small-scale pumps, it is much easier and more cost-efficient to manufacture the impeller with straight blades compared to spiral-profile blades. Methods: Straight-blade impeller designs with different blade angles, blade numbers, and impeller flow passage positions are evaluated using the computational fluid dynamics method. Blade angles (θ = 0°, 20°, 30°, and 40°), blade numbers ( N = 5, 6, 7, and 8), and three positions of impeller flow passage (referred to as top, middle, and bottom) are selected as the studied parametric values. Results: The numerical results reveal that with increasing blade angle, the pressure head and the hydraulic efficiency increase, and the average scalar shear stress and the normalized index of hemolysis decrease. The minimum radial force and axial thrust are obtained when θ equals 20°. In addition, the minimum average scalar shear stress and normalized index of hemolysis values are obtained when N = 6, and the maximum values are obtained when N = 5. Regarding the impeller flow passage position, the axial thrust and the stagnation area forming in the impeller eye are reduced as the flow passage height declines. Conclusion: The consideration of a blade angle can greatly improve the performance of blood pumps, although the influence of the blade number is not very easily determined. The bottom position of the impeller flow passage is the best design.

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Section: Materials and Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impeller (straight blade) design variations and their influence on the performance of a centrifugal blood pump

Fang

Yu³

2020

Int J Artif Organs

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“…After optimization, the hydraulic performance of the pump is stable under all conditions, and the hydroacoustic performance of the impeller is significantly reduced, so the desired objectives are realized. The results are shown in Equations (14) and (15), and Equation 16is the global matrix, which is the average of Equations (14) and (15…”

Section: The Global Optimization Schemementioning

confidence: 99%

“…Furthermore, the vortex shedding or backflow from the impeller blade exit had the same frequency as the pressure pulsation, and that the absolute value of phase differences reflected the vorticity intensity. Chalghoum et al [14,15] analyzed the rotor-stator interaction (impeller and volute) and its effects on the complex internal flow field within a centrifugal pump for a wide range of operating flow rates, and they found that the pressure distributions around the volute tongue were inversely proportional to the evolution of the relative angle between the blade exit and volute tongue. As a result of the rotor-stator interaction, the amplitude and frequencies of the pressure fluctuations rose from the inlet to the outlet of the impeller for the whole flow range.…”

Section: Introductionmentioning

confidence: 99%

The Action Mechanism of Rotor–Stator Interaction on Hydraulic and Hydroacoustic Characteristics of a Jet Centrifugal Pump Impeller and Performance Improvement

Ren

Zhang

et al. 2020

Water

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The aim of this study was to investigate the action mechanism of the rotor–stator interaction (RSI) on the transient flow field and hydrodynamic noise field inside the impeller of jet centrifugal pumps (JCPs) and optimize effects of the guide vane on the hydraulic and hydroacoustic characteristics of the impeller. The numerical method of CFD (computational fluid dynamics) coupled with CFA (computational fluid acoustics) was used to analyze the correlation between the guide vane and the flow/sound performances of the impeller. The orthogonal test method, with the hydroacoustic performance of the impeller taken as the objective, was used to optimize the structural parameters of the guide vane for the stability of the hydraulic performance of the JCP. The results show that the RSI leads to a significant increase in the hydroacoustic level of the impeller, but it is indispensable for improving the hydraulic performance of the pump. The RSI effect on the fluctuation intensity of the transient flow field inside the impeller is much more sensitive than the time-average, and the fluctuation intensity of the flow field is positively correlated with the vortex intensity inside the impeller. When the impeller geometry is constant, the evolution processes of the flow field inside the impeller are mainly related to the blade number of the guide vane; when the number of guide vanes is given, the RSI effect on the hydroacoustic characteristic of the impeller is characterized by a positive correlation between the total sound pressure level (SPL) and the fluctuation intensity of the flow field. The frequency spectrum characteristics of the hydroacoustic SPL of the impeller are not consistent with the pressure fluctuation characteristics inside the impeller. The pressure fluctuation characteristics are related not only to the blade number and speed of the impeller but also to its wake characteristics determined by the guide vane. The optimization scheme for the stable hydraulic performance of the JCP significantly reduced the total SPL of the impeller compared with the original scheme, which verifies the feasibility of using the weight matrix optimization method to obtain the global optimization scheme.

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“…According to the analysis of [10][11][12][13][14][15][16][17][18], the finite element method has advantages in calculation accuracy and reliability compared with other methods. Considering the design requirements and the feasibility of the calculation process, the design variables are a series of discrete variable values.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Influencing Factors and Optimization Design of Combined Push‐Pull Magnetic Drive Coupling

Gao

Chaoqun

Feng

et al. 2019

Mathematical Problems in Engineering

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In order to study the effect of geometrical parameters of magnetic drive coupling on magnetic torque and magnetic eddy current loss, based on the basic theory of electromagnetic field, the influence factors of magnetic performance of combined push-pull magnetic drive coupling are analyzed and optimized by means of finite element numerical calculation and orthogonal experiment. The optimal geometrical parameter scheme of magnetic drive coupling was obtained, and the magnetic performance of the optimal geometrical parameter model was studied experimentally. The geometrical parameters of the optimal scheme of magnetic drive coupling are internal radius of magnet r = 80 mm, thickness of permanent magnet tm = 8 mm, axial length Lb = 144 mm, and thickness of yoke iron ti = 10 mm. The research shows that the optimization design method proposed in this paper is reliable in the design of magnetic drive coupling and can provide some theoretical reference for the design of magnetic drive coupling and the optimization of magnetic torque and magnetic eddy current loss.

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The effects of the rotor-stator interaction on unsteady pressure pulsation and radial force in a centrifugal pump

Cited by 54 publications

References 16 publications

Impeller (straight blade) design variations and their influence on the performance of a centrifugal blood pump

Impeller (straight blade) design variations and their influence on the performance of a centrifugal blood pump

The Action Mechanism of Rotor–Stator Interaction on Hydraulic and Hydroacoustic Characteristics of a Jet Centrifugal Pump Impeller and Performance Improvement

A Study on the Influencing Factors and Optimization Design of Combined Push‐Pull Magnetic Drive Coupling

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