Analysis of the Influence of Inlet Guide Vanes on the Performance of Shaft Tubular Pumps

Jiao, Haifeng; Sun, Chong; Song-shan, Chen

doi:10.1155/2021/5177313

Cited by 6 publications

(4 citation statements)

References 36 publications

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“…Their research revealed that the hydraulic efficiency of the pump device is largely determined by the characteristics of the outlet channel. Jiao, H. [18] studied the influence of front guide vanes on the pressure pulsation of the shaft tubular pumping device and discovered that the front guide vane may enhance the water inlet condition of the impeller and decrease pressure fluctuations on the blade surface. Xu, L. [19] studied the energy characteristics of the front shaft-type tubular pumping station at the inlet angles of two guide vanes, with the aim of increasing the pump station's efficiency.…”

Section: Introductionmentioning

confidence: 99%

Energy Characteristics in the Flow Channel of the Shaft-Type Tubular Pumping Station Considering Tides

He,

Luo,

Cheng

et al. 2024

JMSE

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The shaft-type tubular pumping station has the remarkable characteristics of a large flow rate and high efficiency. It can realize the functions of irrigation, pumping, and drainage through pumping and generating conditions considering tides. Moreover, it is widely used in the plain area of eastern China and the tidal area along the marine region. Due to the different topological features of the airfoil of the impeller, the energy evolution characteristics of the shaft-type tubular pumping station during pumping and generating conditions remain unclear. The entropy generation theory was introduced to numerically simulate the flow pattern and energy characteristics in the shaft-type channel, impeller, and straight channel in operation conditions. The results show that the flow pattern is stable when the shaft-type channel and the straight-type channel are used as the inlet channel under pumping and generating conditions, and a low-pressure region occurs in the contraction section of the shaft-type channel. The velocity of sections of the inlet and outlet and the middle section of the impeller in the generating condition is larger than that in the pumping condition. In addition, the difference in the static pressure on the blade surface nearby the hub is large. With a change in the position of the wingspan, the difference gradually decreases from the small flow condition to the large flow condition. There is a high-entropy production rate zone in the channel contraction section and the shaft-type wall surface of the shaft-type flow channel. When the straight-type channel is used as the outlet flow channel, a high-entropy production region appears near the inlet water surface. In the pumping condition, a high-entropy production area is found at the inlet of the impeller, the blade groove channel, and the inlet of the guide vane. In the generating condition, a high-entropy production area is found at the out-of-impeller outlet, the blade groove channel, and the outlet of the guide vane. These research achievements have some reference value for the design of the shaft-type tubular pumping station considering tides and the study of hydraulic performance, along with the energy characteristics of the channels.

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Section: Introductionmentioning

confidence: 99%

Energy Characteristics in the Flow Channel of the Shaft-Type Tubular Pumping Station Considering Tides

He,

Luo,

Cheng

et al. 2024

JMSE

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show abstract

“…Previous research on shaft tubular pump devices has focused on the structural design optimization of the pipes [17,18], the influence of the position and shape of the impact of the impeller and guide vane on energy performance [19][20][21][22][23], and the flow field and internal flow properties of the devices [24]. However, studies on the tip clearance of the impeller of a shaft-tubular pump device are relatively scarce.…”

Section: Introductionmentioning

confidence: 99%

Leakage Flow Characteristics in Blade Tip of Shaft Tubular Pump

Lin

Yang

Guo

et al. 2023

JMSE

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The shaft tubular pump device is widely used in various water diversion projects because of its ultra-low head and large flow characteristics. Due to the tip clearance between the blade and the shroud, it is easy to cause hydraulic mechanical performance changes, induced vibration, and noise, which seriously affects the safe and stable operation of the pump. Steady and unsteady three-dimensional flow field numerical simulations of a shaft tubular pump device were carried out using computational fluid dynamics to investigate the impeller flow properties of the device under various flow conditions, including the tip clearance leakage flow (TCLF) and change rule of pressure pulsation. The TCLF, vortex morphology evolution, and pressure pulsation properties of the impeller tip clearance were analyzed. The results show that with an increase in the flow rate, the influence of the tip clearance size on the tip clearance flow decreases, the TCLF decreases, and the axial velocity of the water flow at the tip clearance increases. When the flow rate increases, the swirling strength of the tip leakage vortex decreases, and the distance between the tip leakage vortex and the suction surface of the blade increases. With the increase in flow rate, the pressure pulsation amplitude at the tip clearance increases first and then decreases. The focus of this study is to analyze the variation of tip clearance flow field and pressure pulsation under multiple working conditions, aiming to provide some help for improving the performance of the pump device and ensuring its safe operation.

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“…It was found that a free surface vortex tends to trigger low-frequency PP and induce unit resonance. Jiao et al [14] found that the installation of the inlet guide vane at the impeller inlet of a shaft tubular pump could induce low-frequency PP. Yang et al [15] studied the PP characteristics in the axial-flow-pump skip-shaped channel by using numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Positive and Negative Performance Analysis of the Bi-Directional Full-Flow Pump with an “S” Shaped Airfoil

Jiao

Wang

Liu

et al. 2023

JMSE

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In this study, model tests and numerical simulations are conducted to study the bi-directional full-flow pump (BFFP). Firstly, the head, efficiency and shaft power of the BFFP are significantly higher in the positive operating condition than in the negative operating condition. When the unit operates in the positive direction, the clearance reflux flow rate, the flow uniformity and velocity-weighted average angle of the impeller inlet, and the intensity of pressure pulsation are significantly greater than those during the negative operation. When the pump unit is operating at low flow rates, the clearance reflux produces a significant disturbance to the impeller inlet main flow. Two vortices appear in the near-wall area of the clearance outlet (i.e., impeller inlet), and the range of vortices is larger in the positive operation than in the negative operation. Secondly, at low-flow and design-flow conditions, the total entropy production of the pump unit in the positive direction is greater than that in the negative direction. When at small- and design-flow rates, the amplitude of pressure pulsation in the positive direction is smaller than that in the negative direction. This study will contribute to the research and development of a full-flow pump.

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Analysis of the Influence of Inlet Guide Vanes on the Performance of Shaft Tubular Pumps

Cited by 6 publications

References 36 publications

Energy Characteristics in the Flow Channel of the Shaft-Type Tubular Pumping Station Considering Tides

Energy Characteristics in the Flow Channel of the Shaft-Type Tubular Pumping Station Considering Tides

Leakage Flow Characteristics in Blade Tip of Shaft Tubular Pump

Positive and Negative Performance Analysis of the Bi-Directional Full-Flow Pump with an “S” Shaped Airfoil

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