Numerical Investigation of Back Vane Design and Its Impact on Pump Performance

Mortazavi, Farzam; Riasi, Alireza; Nourbakhsh, Ahmad

doi:10.1115/1.4037281

Cited by 21 publications

(5 citation statements)

References 24 publications

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“…It is referred to as a model of SST model which was associated to benefits of k-ω turbulence model for simulation of features of the k-ε turbulence model and the near-wall boundary layer, wherein small dependence concerning conditions of the far-field boundary was involved. Hence, its accuracy and reliability of prediction are higher [ 22 – 24 ]. The eddy viscosity and k equation and ω equation of the SST model can be written into the following form: …”

Section: Methodology and Toolsmentioning

confidence: 99%

Numerical simulation of unsteady aerodynamic interactions of contra-rotating axial fan

Luan¹,

Weng²,

Luan³

2018

PLoS ONE

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This paper describes the investigations performed to better understand unsteady effect that develop in a contra-rotating axial fan. More specifically, this study focuses on rotor-rotor interactions effects on unsteady characteristic and blade aerodynamic force. The investigation method is based on three-dimensional URANS simulations, in conjunction with SST turbulence model. At first, the experimental measurements are compared to evaluate ability of the numerical method in estimation of unsteady flows. The results show that rotor-rotor interaction in the contra-rotating fan played an important role in aerodynamic efficiency. Unsteady effect increased flow losses of rotor 1, but effectively inhibited flow losses of rotor 2. The inhibition effect was mainly caused by wake recovery effect of upstream wakes in the flow passage of rotor 2. Meanwhile, negative jet flow enhanced boundary layer energy of the blade of rotor 2, so that flow separation was postponed. Different configurations consider five sets of axial spacing dimensions. Specific survey of flows under the same operation conditions indicates that axial spacing is responsible for the unsteady interaction effect. The blade aerodynamics analysis shows that the influence of the downstream potential flow disturbance on rotor 1 is greater than the effect of the upstream wake on rotor 2.

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Section: Methodology and Toolsmentioning

confidence: 99%

Numerical simulation of unsteady aerodynamic interactions of contra-rotating axial fan

Luan¹,

Weng²,

Luan³

2018

PLoS ONE

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“…An extensive study on the topic of proper design of the balancing vanes was carried out by Godbole et al [127], who studied the effects of the number of back vanes, the back vane radius, the back vane height, and clearance between casing cover and back vanes on the resulting axial thrust. Mortazavi [128] related those geometrical characteristics of back vanes to the impact on efficiency and also investigated the changes of flow pattern that were caused by a different construction of back vanes. The flow field in sidewall gaps is influenced rapidly, and a completely different regime can be achieved there.…”

Section: Axial Thrustmentioning

confidence: 99%

Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review

Zemanová

Rudolf

2020

Energies

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The paper critically reviews the current state of the art in flow inside sidewall gaps of hydraulic pumps and turbines. It describes the consequences of the presence of this type of flow in turbomachinery and then relates it to other physical phenomena that determine the behavior, operating characteristics, and overall performance of the machine. Despite the small dimensions of the rotor-stator spaces, the flow in these regions can significantly affect the overall flow field and, consequently, efficiency. The circulation of the fluid inside the gaps and secondary flow that is caused by rotating elements influences the disk friction losses, which is of great importance, especially in the case of low specific speed pumps and turbines. The flow pattern affects the pressure distribution inside a machine and, thus, generates axial thrust. The presence of secondary flow also significantly changes the rotordynamics and can bring about undesirable vibrations and acoustics issues. This article aims to review and summarize the studies that were conducted on the mentioned phenomena. Experimental and numerical studies are both taken into consideration. It proposes some requirements for prospective research in order to fill current gaps in the literature and reveals the upcoming challenges in the design of hydraulic machines.

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“…While, up to now, there is no published study about the impact of back clearance configuration on blood damage. Back vanes are a common structure in industrial pumps, that is, small vanes are installed at the bottom of the rotor, so that the back vanes rotate synchronously with the rotor 33 . A study by Wu et al 34 found that the back vanes applied to the centrifugal blood pump were effective in reducing the secondary flow and flow separation in the back clearance and improving blood flow.…”

Section: Introductionmentioning

confidence: 99%

The impact of rotor configurations on hemodynamic features, hemocompatibility and dynamic balance of the centrifugal blood pump: A numerical study

Wang

et al. 2022

Numer Methods Biomed Eng

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To investigate the effect of rotor design configuration on hemodynamic features, hemocompatibility and dynamic balance of blood pumps. Computational fluid dynamics was employed to investigate the effects of rotor type (closed impeller, semi‐open impeller), clearance height and back vanes on blood pump performance. In particular, the Eulerian hemolysis model based on a power‐law function and the Lagrangian thrombus model with integrated stress accumulation and residence time were applied to evaluate the hemocompatibility of the blood pump. This study shows that compared to the closed impeller, the semi‐open impeller can improve hemolysis at a slight sacrifice in head pressure, but increase the risk of thrombogenic potential and disrupt rotor dynamic balance. For the semi‐open impeller, the pressure head, hemolysis, and axial thrust of the blood pump decrease with increasing front clearance, and the risk of thrombosis increases first and then decreases with increasing front clearance. Variations in back clearance have little effect on pressure head, but larger on back clearance, worsens hemolysis, thrombogenic potential and rotor dynamic balance. The employment of back vanes has little effect on the pressure head. All back vanes configurations have an increased risk of hemolysis in the blood pump but are beneficial for the improvement of the rotor dynamic balance of the blood pump. Reasonable back vanes configuration (higher height, wider width, longer length and more number) decreases the flow separation, increases the velocity of blood in the back clearance, and reduces the risk of blood pooling and thrombosis. It was also found that hemolysis index (HI) was highly negatively correlated with pressure difference between the top and back clearances (r = −.87), and thrombogenic potential was positively correlated with pressure difference between the top and back clearances (r = .71). This study found that rotor type, clearance height, and back vanes significantly affect the hydraulic performance, hemocompatibility and rotor dynamic balance of centrifugal blood pumps through secondary flow. These parameters should be carefully selected when designing and optimizing centrifugal blood pumps for improving the blood pump clinical outcomes.

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Numerical Investigation of Back Vane Design and Its Impact on Pump Performance

Cited by 21 publications

References 24 publications

Numerical simulation of unsteady aerodynamic interactions of contra-rotating axial fan

Numerical simulation of unsteady aerodynamic interactions of contra-rotating axial fan

Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review

The impact of rotor configurations on hemodynamic features, hemocompatibility and dynamic balance of the centrifugal blood pump: A numerical study

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