Effect of hub inclination angle on internal and external characteristics of centrifugal pump impellers

Kuang, Renfei; Zhang, Zhiming; Wang, Shaolong; Chen, Xiaoping

doi:10.1063/5.0038109

Cited by 7 publications

(5 citation statements)

References 31 publications

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“…e pressure fluctuation at each monitoring point is closely related to the relative position between blades and volute tongue [29]. As can be seen from Figure 6(a), the pressure fluctuation at the monitoring point has an obvious periodic fluctuation rule.…”

Section: Unsteady Pressure Fluctuation At Impellermentioning

confidence: 92%

Numerical Study of Unsteady Pressure Fluctuation at Impeller Outlet of a Centrifugal Pump

Zheng

et al. 2022

Science and Technology of Nuclear Installations

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Intense fluid-dynamic interaction at the impeller outlet strongly affects the unsteady flow and pressure stability within the centrifugal pump. In order to have a better understanding of the pressure fluctuation of centrifugal pumps, a numerical calculation is carried out by using the RNG k-epsilon turbulence model under various flow rates. The numerical calculation results are compared with the experimental results in order to verify the reliability of the calculation model. The amplitude and frequency distribution of pressure fluctuation at the impeller outlet is obtained and analyzed in the time and frequency domain. The research results show that the blade passing frequency is the dominant frequency of the pressure fluctuation. And the pressure fluctuation is a periodic fluctuation. As the flow rate decreases, the periodicity of the pressure fluctuation decreases. Besides, the amplitude and intensity of pressure fluctuation are closely related to flow rate and spatial location. At the low flow rate, the amplitude of pressure fluctuation in the time domain and frequency domain is enlarged greatly, especially near the tongue region. The pressure difference distribution on both sides of the blade surface is extremely uneven, and the pressure changes significantly.

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Section: Unsteady Pressure Fluctuation At Impellermentioning

confidence: 92%

Numerical Study of Unsteady Pressure Fluctuation at Impeller Outlet of a Centrifugal Pump

Zheng

et al. 2022

Science and Technology of Nuclear Installations

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“…It ensures the accuracy of heat transfer between the liquid field and the solidity field. This offers a reliable foundation for the subsequent calculation of thermal stress on guide blades and the calculation of aerodynamic and friction torques [23][24][25]. Figure 3 gives the angular motion of the guidance blade.…”

Section: The Rotatability Of Computational Domain Meshmentioning

confidence: 99%

Study of blade moment calculation on variable geometry turbine adjusting mechanism

Zhong,

Chen,

Qin

et al. 2024

J. Phys.: Conf. Ser.

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In recent years, the layout of rotary instructing leaves in mutable loop worm wheels has been a research hotspot. The rotary instructing leaves are subjected to the action of hyperthermal and nippy airstream and the influence of frictional force on the spin axis. For the rotary instructing leaves, the combined action of hyperthermal and nippy airstream generates an aerodynamical moment, while frictional force generates a frictional moment. When the rotary instructing leaves rotate, the aerodynamical moment and frictional moment constantly change as the angular motion of the blades. This research is rare, and there is no mature case for reference. The article applies fluid-structure coupled heat transfer and software programming to seek the blade moment. During the process of blade angular motion from -10° to +10°, the total moment of the blade earlier rises and afterward falls. When the blade angular position is -2°, the total moment runs to vertex 3.74489 N·m. Test data from the exploration laboratory have validated this conclusion. The maximum deviation compared to the test data of the exploration laboratory is 4.562%. The aerodynamical and frictional moments are momentous indicators for mutable loop worm wheel study. They can offer physical references for the mutable loop design of a turbo. The paper can also offer a new method for the blade moment calculation. This is important sense for the innovation of mutable cyclic worm wheels.

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“…The numerical formulation for the validation research employs identical input parameters as the experimental work. Figures 2 and 3, respectively, [14] exhibit the characteristic curves for head vs. volume coefficient and relative theoretical efficiency versus volume coefficient for experimental and numerical data. The differences between the CFD and experimental outcomes in terms of error percentage are computed.…”

Section: Validation Of the Numerical Analysismentioning

confidence: 99%

“…The numerical research findings revealed that within the design value range, the curvature of the impeller hub profile increased as the flow range and surge margin of the compressor impeller increased. Kuang et al [14] discovered that the hub inclination angle (HIA) has a substantial impact on the flow characteristics of a centrifugal pump impeller. The large eddy simulation turbulence model is used in their research to simulate centrifugal pump impeller internal flow at two HIA values under design and off-design situations.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigations and Artificial Neural Network-Based Performance Prediction of a Centrifugal Fan Having Innovative Hub Geometry Designs

Nagaraj,

Karanth

2023

ASI

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It is a well-known fact that air approaches the eye region of the rotating impeller of a centrifugal fan with shock-less entry conditions in an ideal scenario. The flow in this region is associated with induced swirl losses, leading to cumulative performance losses. Proper flow guidance in the vicinity of the eye region is essential to minimize possible flow losses. The flow guiding structure may be in the form of a projection or extrusion connected to the rotating impeller of the turbo machines and is generally named a hub. These attachments enhance the overall flow augmentation of the turbo machines in terms of static pressure improvement by reducing a significant amount of inlet turning losses. This article attempts to highlight the efficacy of hubs of various shapes and sizes on the pressure rise of the centrifugal fan using Computational Fluid Dynamics (CFD). Simulation results revealed that the optimized hub configuration yields about an 8.4% higher head coefficient and 8.6% higher relative theoretical efficiency than that obtained for the hub-less base configuration. This improvement in these paraments therefore also commemorates the global progress in energy efficiency as per the UN’s Sustainable Development Goals, SDG 7 in particular. Simultaneously, in the Artificial Neural Network (ANN), a Multi-Layer Perceptron (MLP) model is used to forecast the performance of a centrifugal fan with an optimized hub design. The results predicted by the ANN model are found to be in close agreement with the optimized hub shape’s numerical results.

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Effect of hub inclination angle on internal and external characteristics of centrifugal pump impellers

Cited by 7 publications

References 31 publications

Numerical Study of Unsteady Pressure Fluctuation at Impeller Outlet of a Centrifugal Pump

Numerical Study of Unsteady Pressure Fluctuation at Impeller Outlet of a Centrifugal Pump

Study of blade moment calculation on variable geometry turbine adjusting mechanism

Numerical Investigations and Artificial Neural Network-Based Performance Prediction of a Centrifugal Fan Having Innovative Hub Geometry Designs

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