Effects of inlet guide vane and blade pitch angles on the performance of a submersible axial-flow pump

Kim, Youn-Sung; Shim, Hyeon-Seok; Kim, Kwang‐Yong

doi:10.1177/0957650920954967

Cited by 6 publications

(6 citation statements)

References 11 publications

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“…According to Yang et al 7 , the research pump model includes eleven conical-tip symmetrical IGVs. The Kim et al 5 and Nguyen et al 6 studies include an IGV taking the form of a simple blade rounded at the leading edge (LE) and trailing edge (TE) with constant thickness. Furthermore, in the studies of Feng et al 3 and Guo et al 4 , the shape of the IGV is rather rudimentary, with a rectangular profile.…”

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

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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%

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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“…Wang et al [11] combined numerical simulations and experimental verification to reveal the development process of the skewed flow characteristics inside the S-shaped channel of a 15-degree slanted axial flow pump. Kim et al [12] found that the steady and unsteady performance characteristics of a submersible axial flow pump depend on the inlet guide vanes (IGV) and blade pitch angle. Zhou et al [13] improved the internal flow characteristics of an axial flow pump under low flow conditions by adopting a double-inlet structure and combining numerical simulations with experimental methods.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Complex Three-Dimensional Flow Structure in the Circulation Pump of the Flow-Making System Based on Delayed Detached Eddy Simulation

et al. 2023

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As the core component of the flow-making system, the circulating pump has differences in its internal flow structure under different operating conditions, which affects the flow quality of the environmental simulation test area and the authenticity of marine environmental simulation. To explore the internal flow characteristics and outlet evolution characteristics of the circulating pump, this paper uses the DDES (delayed detached eddy simulation) method for numerical simulation. This paper combines BVF (boundary vorticity flow) diagnosis and the limit streamline method to analyze the evolution characteristics of the unstable flow area on the blade surface; it uses the Q criterion to identify the vortex structure inside the pump and analyze its evolution and development laws. Additionally, a quantitative analysis of the flow state of the circulating pump using flow uniformity indexes is performed. The results show that the surface of impeller blades is uniform under 1.0 QN. At 0.7 QN, the evolution process of the blade suction surface BVF is periodic, with a corresponding period of about 2/9 T (0.02 s). At 1.0 QN, the strength and scale of the separated vortices inside the guide vanes are minimized compared to other flow rates, and the scale and strength of the vortices show a decreasing trend along the outer normal direction. The evolution period of the separation vortex on the pressure surface of the guide vane is about 1/3 T (0.033 s) under 1.1 QN and the evolution period of the suction surface of the guide vane is about 2/3 T (0.067 s) under 0.7 QN. The flow uniformity indexes value downstream of the pump outlet under 1.0 QN are very close to the ideal value; with a corresponding value of Ϛi = 0.023, θ¯ = 89.94°, γ = 0.95, λ = 97.9%, the outflow can be approximately regarded as axial uniform flow. The research results can provide theoretical support for the further optimization design of circulating pumps and lay the foundation for the implementation of real systems.

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“…It is urgent to study the three-dimensional dynamic flow inside the vertical axial flow pump device. Many scholars in China and abroad have carried out a lot of research work, and the main research contents are focused on the analysis of the three-dimensional flow field inside the axial flow pump device [2][3][4][5] and the numerical analysis of the internal pressure pulsation of the axial flow pump device [6][7][8]. Study on three-dimensional shape optimization of axial flow pump device flow structure [9][10][11]; the mechanism of cavitation flow in axial flow pump device [12,13], and the influence of inflow conditions on the flow and pulsation characteristics of axial flow pump device [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Chaoyue Wang et al [4] found that there was a flow deviation phenomenon in the S-shaped channel of the slanted axial flow pump, and carried out numerical simulation research and field measurement on the test bench to clarify the mechanism of this phenomenon. Kim Youn Sung et al [5] explored the influence of inlet guide vane and blade angle on three-dimensional steady and unsteady flow of submersible axial flow pump. Ahmed Ramadhan Al-Obaidi et al [6] studied the pressure pulsation of axial flow pump and analyzed the relationship between pressure pulsation and cavitation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Timing Effect on Flow Field and Pulsation in Vertical Axial Flow Pump

Yang

Chang

Yuan

et al. 2021

JMSE

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Vertical axial flow pump device has the characteristics of large flow and low head, which is widely used in pumping station projects with head of 3–9 m. In order to study the influence of the timing effect of the impeller relative flow channel and guide vane on the flow field and pulsation in the axial flow pump device, the whole flow channel of the vertical axial flow pump device was taken as the research object. The reliability of the numerical simulation was verified by physical model test. The flow field characteristics and pressure pulsation characteristics of the inlet and outlet regions of the impeller, the guide vane and the campaniform inlet conduit at different timing positions of the impeller under different flow rates were analyzed. The results show that the pressure coefficient distribution of the impeller inlet of the vertical axial flow pump device presents four high-pressure areas and four low-pressure areas with the rotation of the impeller. The pressure pulsation at the inlet and outlet of the impeller is mainly affected by the rotation of the impeller, and the main frequency is 4 times the rotation frequency amplitude of pressure pulsation decreases with the increase of flow rate. When the flow rate increased from 0.8 Qbep to 1.2 Qbep, the average velocity circulation at the guide vane outlet decreased by 12%; there is an obvious negative value region of the internal regularized helicity of the guide vane. When the flow rate increases from 0.8 Qbep to 1.2 Qbep, the amplitude of the pressure pulsation coefficient at the outlet of the guide vane decreases gradually, with a decrease of 94%. When the flow rate is 1.2 Qbep, the main frequency and the secondary frequency of the pressure pulsation are both low-frequency, with obvious low-frequency pulsation characteristics. Under the small flow condition of 0.8 Qbep, the outlet flow fluctuation of seven guide vane was 18.9% on average, and the flow variation of each guide vane was large. Under the optimal flow condition of 1.0 Qbep and large flow condition of 1.2 Qbep, the outlet flow fluctuation of 7 guide vane is 4.7% and 0.56% on average, and the flow change of each guide vane is stable. The outlet flow of the guide vane is mainly concentrated in two guide vane slots of the guide vane, and the flow ratios are 30.56%, 30.14% and 29.16% under three flow conditions, respectively. The research results provide a scientific basis for the optimization design and stable operation of vertical axial flow pump device.

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Effects of inlet guide vane and blade pitch angles on the performance of a submersible axial-flow pump

Cited by 6 publications

References 11 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

Analysis of the Complex Three-Dimensional Flow Structure in the Circulation Pump of the Flow-Making System Based on Delayed Detached Eddy Simulation

Analysis of Timing Effect on Flow Field and Pulsation in Vertical Axial Flow Pump

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