The Influence of Inlet Guide Vane and Diffuser Vane on Internal Flow Characteristics in an Axial Flow Pump

Nguyen, Duc-Anh; Ma, Sang-Bum; Kim, Sung Hoon; Kim, Jin‐Hyuk

doi:10.5855/energy.2021.30.4.094

Cited by 3 publications

(2 citation statements)

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“…The operation of the pump is directly affected by the geometry of these main components. The IGV is a device widely used in turbomachinery and in axial-flow pumps; it can help reduce the turbulence in the flow before it enters the impeller, creating a soft fluid flow that functions under low-flow-rate conditions 2 . Additionally, by rotating the IGV setting angle, the IGV can increase or decrease the flow rate and control the direction of the fluid flow in front of the impeller 3 – 7 .…”

Section: Introductionmentioning

confidence: 99%

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Improvement in energy performance from the construction of inlet guide vane and diffuser vane geometries in an axial-flow pump

Nguyen,

Dinh,

Kim

2024

Sci Rep

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Advanced inlet guide vane (IGV) and diffuser vane (DV) geometries were constructed in an effort to increase the energy performance of an axial-flow pump at the best efficiency point (BEP). DV setting angles were also investigated to increase energy performance at the off-design points. By integrating the advantages of an adjustable IGV, combinations of adjustable IGV and DV geometries were constructed and thoroughly analyzed by way of energy loss. The asymmetrical geometry of the IGV, upgraded through the use of a hydrofoil profile, resulted in higher hydraulic performance compared to that of the reference model. The efficiency and total head at the BEP increased significantly with the implementation of the new DV, by 1.456% and 5.756% over those of the reference model, respectively. Using the new DV reduced the unsteady turbulent flow behind the trailing edge of the DV under all flow rate conditions, resulting in a reduction in vibration and noise. The positive setting angles of the DV increased the energy performance in the high-flow-rate region, whereas the negative DV setting angles produced a good performance in the low-flow-rate region. Combining an adjustable IGV with an adjustable DV model resulted in a significant increase in the total head, with more optimal energy performance provided by the positive IGV setting angles. At the BEP and under high-flow-rate conditions, the low-velocity zone is closely related to high entropy generation. Furthermore, these high-entropy generation regions follow the trajectory of the low-velocity zones. However, the low-velocity zone is not strongly associated with the high-entropy generation region when operating under low-flow-rate conditions.

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Section: Introductionmentioning

confidence: 99%

“…In theory, the DV passage is characterized by a gradually larger cross-sectional area in the flow path, which reduces the fluid velocity and increases the pressure 17 . This method has been applied in many different axial-flow pumps 2 , 18 – 21 . In fact, even after optimization, this type of profile is still used 12 , 13 .…”

Section: Introductionmentioning

confidence: 99%

Improvement in energy performance from the construction of inlet guide vane and diffuser vane geometries in an axial-flow pump

Nguyen,

Dinh,

Kim

2024

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

Hydrodynamic optimization of the impeller and diffuser vane of an axial-flow pump

Nguyen

Kim

et al. 2023

J Mech Sci Technol

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Influence of inflow directions and setting angle of inlet guide vane on hydraulic performance of an axial-flow pump

Nguyen

Kim

et al. 2023

Sci Rep

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Inlet flow direction significantly affects the hydraulic performance of an axial-flow pump. Usually, the research papers ignore this phenomenon, resulting in discrepancies between simulation and experimental results. This study examines the influence of inflow direction in five cases (0%, 5%, 10%, 15%, and 30% pre-swirl intensities) to determine the relationship between the pre-swirl intensity and the hydraulic performance of the axial-flow pump. Based on this, changing the setting angle of the inlet guide vane (IGV) is proposed and thoroughly investigated to reduce the effect of inflow direction. In this study, the influence of clearances in IGV blades on hydraulic performance is also investigated in detail. Numerical simulations are performed using ANSYS–CFX and a shear stress transport reattachment modification (SST k-$$\omega$$ ω ) turbulence model with small y+ values at all walls. Specifically, the hydraulic performance curves and internal flow characteristics, including contours and streamlines, are assessed and analyzed. The inflow direction significantly impacts the hydraulic efficiency of the axial-flow pump. Increased pre-swirl intensity causes more loss in the IGV passage. The internal flow field and performance are not affected by the clearance at the hub and shroud of the IGV. However, the tip clearance of the impeller causes a decrease in hydraulic efficiency due to the tip leakage vortex. By adjusting the setting angle of the IGV, the efficiency and head gradually increase from a negative to a positive setting angle. Additionally, 30° is considered the critical setting angle for IGV.

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The Influence of Inlet Guide Vane and Diffuser Vane on Internal Flow Characteristics in an Axial Flow Pump

Cited by 3 publications

References 0 publications

Improvement in energy performance from the construction of inlet guide vane and diffuser vane geometries in an axial-flow pump

Improvement in energy performance from the construction of inlet guide vane and diffuser vane geometries in an axial-flow pump

Hydrodynamic optimization of the impeller and diffuser vane of an axial-flow pump

Influence of inflow directions and setting angle of inlet guide vane on hydraulic performance of an axial-flow pump

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