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

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

doi:10.1007/s12206-022-1217-0

Cited by 9 publications

(7 citation statements)

References 32 publications

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“…At design conditions, the axial-flow pump can stably operate for a long time with high performance and no phenomena. Notwithstanding, at low flow rate conditions, internal flow physics are unstable, and the stall phenomenon occurs, causing a sharp drop in hydraulic performance 3 , 15 , 16 , 22 . When the pump operates in the saddle zone, loud noises and severe vibrations are produced.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…The results showed that the total efficiency and pressure head of the optimum model increased by 9.03% and 4.61%, respectively, in comparison with that of the reference model. According to Nguyen et al 13 , optimization technology was also applied to the impeller and DV to improve the performance of the axial-flow pump. Consequently, the efficiency and pressure head of the optimum model increased by 3.097% and 10.205%, respectively, compared to those of the reference model.…”

Section: Introductionmentioning

confidence: 99%

“…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 . However, there are many other studies that employ a straight hub and shroud profiles inside the DV passage, instead of a gradually increasing area profile 22 – 25 .…”

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

Self Cite

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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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“…The influence of impeller-diffuser interactions on an impeller's performance at a particular tip clearance was performed using CFD code ANSYS CFX [5]. The hub vaned diffuser's stage efficiency peaked at 0.5 h/b ratios along with lower flow rates.…”

Section: Introductionmentioning

confidence: 99%

Effect of Centrifugal Compressor with Influence on Partial Vaned Diffuser

Sivasubramaniyan,

Muthusamy,

Kuppusamy

et al. 2024

The International Conference on Processing and Performance of Materials (ICPPM 2023)

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

Cited by 9 publications

References 32 publications

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

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

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

Effect of Centrifugal Compressor with Influence on Partial Vaned Diffuser

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