Effect of Stall Cells on Pressure Fluctuations Characteristics in a Centrifugal Pump

Zhou, Peijian; Dai, Jiacheng; Yan, Chaoshou; Zheng, Shuihua; Ye, Changliang; Zhang, Xiang

doi:10.3390/sym11091116

Cited by 16 publications

(5 citation statements)

References 24 publications

(29 reference statements)

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“…With the increasing popularity of wind tunnel experimental equipment and its ability to provide a wider range of basic information, it is widely used in wind experiments [56,57].…”

Section: Research On Noise Reduction Of Leading-edge Bionic Bladesmentioning

confidence: 99%

A Review of Bionic Structures in Control of Aerodynamic Noise of Centrifugal Fans

Zhou

Xiang

et al. 2023

Energies

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Due to the complexity of the working conditions and the diversity of application scenarios, the normal operation of a fan, whether volute tongue, volute shell surface, or blade, often encounters some unavoidable problems, such as flow separation, wear, vibration, etc.; the aerodynamic noise caused by these problems has a significant impact on the normal operation of the fan. However, despite the use of aerodynamic acoustics to design low-noise fans or the use of sound absorption, sound insulation, and sound dissipation as the main traditional noise control techniques, they are in a state of technical bottleneck. Thus, the search for more efficient methods of noise reduction is looking toward the field of bionics. For this purpose, this paper first analyzes the mechanism of fan noise in the volute tongue and blades, and then, this paper reviews the noise control mechanism and improvement research using the bionic structures in the volute tongue structure, the contact surface of the volute shell, and the leading and trailing edges of the blade in the centrifugal fan. Finally, the current challenges and prospects of bionic structures for aerodynamic noise control of centrifugal fans are discussed.

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“…With the increasing popularity of wind tunnel experimental equipment and its ability to provide a wider range of basic information, it is widely used in wind experiments [56,57].…”

Section: Research On Noise Reduction Of Leading-edge Bionic Bladesmentioning

confidence: 99%

A Review of Bionic Structures in Control of Aerodynamic Noise of Centrifugal Fans

Zhou

Xiang

et al. 2023

Energies

Self Cite

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“…Even for single-phase flow, there are several studies that show the limitations of statistical models and the benefits of scale-resolving models in terms of large-eddy simulations (LES). Examples are the prediction of an inhomogeneous flow distribution at part load [85], head instabilities [86], part load instabilities and flow separation [87][88][89][90][91][92][93][94], tip vortices [95], pressure and velocity fluctuations due to rotor-stator interaction [96][97][98][99][100][101][102][103][104][105], as well as entropy production [106]. According to Refs.…”

Section: Turbulence-scale Resolving Approach and Scale-adaptive Simul...mentioning

confidence: 99%

State of the Art on Two-Phase Non-Miscible Liquid/Gas Flow Transport Analysis in Radial Centrifugal Pumps Part C: CFD Approaches with Emphasis on Improved Models

Hundshagen

Skoda

2023

IJTPP

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Predicting pump performance and ensuring operational reliability under two-phase conditions is a major goal of three-dimensional (3D) computational fluid dynamics (CFD) analysis of liquid/gas radial centrifugal pump flows. Hence, 3D CFD methods are increasingly applied to such flows in academia and industry. The CFD analysis of liquid/gas pump flows demands careful selection of sub-models from several fields in CFD, such as two-phase and turbulence modeling, as well as high-quality meshing of complex geometries. This paper presents an overview of current CFD simulation strategies, and recent progress in two-phase modeling is outlined. Particular focus is given to different approaches for dispersed bubbly flow and coherent gas accumulations. For dispersed bubbly flow regions, Euler–Euler Two-Fluid models are discussed, including population balance and bubble interaction models. For coherent gas pocket flow, essentially interface-capturing Volume-of-Fluid methods are applied. A hybrid model is suggested, i.e., a combination of an Euler–Euler Two-Fluid model with interface-capturing properties, predicting bubbly flow regimes as well as regimes with coherent gas pockets. The importance of considering scale-resolving turbulence models for highly-unsteady two-phase flow regions is emphasized.

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“…However, the oil discharge mechanism of the gerotor pump results in fluid pressure fluctuations within the pump. Moreover, local cavitation in the flow passages, stall vortex, and secondary flow also contribute to pressure fluctuations within the pumps [2][3][4]. These pressure fluctuations can lead to vibration and noise, intensify local cavitation, further disrupt the flow field structure within the pump, impact the performance of the gerotor pump, and even trigger resonance, resulting in pump losses.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Cavitating Flow-Induced Pressure Fluctuations in a Gerotor Pump

Zhou,

Cui,

Xiao

et al. 2023

Energies

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Using the RNG k-ε turbulence model and a full cavitation model, this study numerically simulated cavitating flow-induced pressure fluctuations in a gerotor pump and analyzed the relationship between cavitating flow and pressure fluctuations. The results demonstrate that, as the inlet pressure decreases, the cavitation phenomenon in the gerotor pump intensifies, and the cavitation range in the rotor increases. Some of the vapor even spreads into the oil inlet groove, leading to high vapor content in the chamber that is in contact with the oil inlet groove. The pressure fluctuation characteristics of the flow field in the pump exhibit evident periodic changes. Under different cavitation conditions, the pressure fluctuation amplitude at the monitoring point decreases with increasing inlet pressure, whereas the main frequency of pressure fluctuation remains unaffected by cavitation conditions. The pressure fluctuation amplitude is the strongest at point O1 of demarcation between the low-pressure and high-pressure zones in the chamber, and the volume between the oil inlet groove and the oil outlet groove serves as the main vibration source in the rotor pump. To ensure the stable and efficient operation of the gerotor pump, it is recommended to operate it at a larger NPSH.

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Effect of Stall Cells on Pressure Fluctuations Characteristics in a Centrifugal Pump

Cited by 16 publications

References 24 publications

A Review of Bionic Structures in Control of Aerodynamic Noise of Centrifugal Fans

A Review of Bionic Structures in Control of Aerodynamic Noise of Centrifugal Fans

State of the Art on Two-Phase Non-Miscible Liquid/Gas Flow Transport Analysis in Radial Centrifugal Pumps Part C: CFD Approaches with Emphasis on Improved Models

Numerical Study on Cavitating Flow-Induced Pressure Fluctuations in a Gerotor Pump

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