Investigation on the Changing Characteristics of Flow-Induced Noise in a Centrifugal Pump

Li, Guanpeng; Sun, Liting; Wang, Zhaoyang; An, Chunguo; Guo, Chang; Cheng, Shiou–Ying; Gao, Ming

doi:10.32604/fdmp.2021.016507

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…Through theoretical analysis of the dynamic characteristics of the fluid particles in the impeller, the effects of the rotational centrifugal force, Coriolis force, and curved centrifugal force on the movement characteristics of the fluid particles in the impeller were identified, and ways for impeller hydraulic optimization were proposed. In literature [9], by combining the Powell vortex sound theory, numerical simulations and experimental measurements, this research explores the trends of variation and the corresponding underlying mechanisms for the flow-induced noise at various locations and under different operating conditions. It is shown that the total sound source intensity (TSSI) and total sound pressure level (TSPL) in the impeller, in the region between the inlet to the outlet and along the circumferential extension of the volute, are much higher than those at pump inlet and outlet.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Structural Parameters of a Plastic Centrifugal Pump

Shi¹,

Tang²,

Tan³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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The structural design parameters of a plastic centrifugal pump were calculated and modeled, and flow field simulation analysis of the model was performed using CFD, in the framework of an orthogonal design method (or experiment). The inlet mounting angle β1, outlet mounting angle β2, wrap angle ϕ, and impeller inlet diameter D1 of the pump impeller were the four factors assumed for the application of the orthogonal experiment, using the efficiency and Net Positive Suction Head (NPSH) as evaluation indices. Moreover, taking the maximum efficiency and minimum NPSH of the plastic centrifugal pump as the evaluation factors, the parameters of the pump impeller were re-optimized through the Taguchi algorithm (leading to the following optimal combination: inlet diameter 35 mm, inlet angle 26°, outlet angle 27°, and wrap angle 110°). The minimum NPSH and the maximum efficiency have been found to be 0.957% and 61.5%, respectively.

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Section: Introductionmentioning

confidence: 99%

Optimization of the Structural Parameters of a Plastic Centrifugal Pump

Shi¹,

Tang²,

Tan³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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“…Si et al (2019) summarized the recent developments of the flow-induced noises in a centrifugal pump; especially, the different numerical and experimental methods that had been used to analyze the internal flow properties and its effect on the generation of flow-induced noise. Li et al (2021) explored the trends of variation and the corresponding underlying mechanisms for flow-induced noise at various locations and under different operating conditions. Jiang et al (2007) used multi-stage centrifugal pump and showed that the generation of noise could be best calculated by the fluid-structure weakly coupled simulations.…”

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confidence: 99%

Simulation study on the flow-induced vibration and noise in marine centrifugal pumps

Zhao

Chai

2023

Journal of Vibration and Control

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Due to the three-dimensional non-axisymmetric shape of the volute, its interaction with the impeller increases the internal flow field complexity and instability of the marine centrifugal pump, representing the main reason for pump body vibration and hydraulic noise. First, the basic principle of fluid machinery noise calculation was explained based on the Lighthill acoustic analogy method and Curle’s theory. Then, the fluid pressure pulsation and flow characteristics of centrifugal pumps were analyzed using the Fluent software, after which the Actran software was used to examine the flow-induced vibration noise properties. The results showed that the clearance size significantly impacted the pump head, while the peak value of the flow-induced vibration response was mainly twice the blade frequency. Although a larger ring clearance increased the structural vibration, it had little impact on the sound pressure level changes in the external sound field. The results provided a new method for the structural optimization and low-noise design of marine centrifugal pumps.

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Modal Analysis and Optimization of Fluid-Structure Coupling for Rotor and Inner Cylinder of Vertical Condensate Pump

He,

Liu,

et al. 2024

MENG

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Background: Low-frequency resonance is one of the common issues encountered during the variable-frequency operation of condensate water pumps. There have been numerous patents and papers proposing solutions to address the low-frequency resonance problem in condensate water pumps. However, the solutions for resonance problems often need to be tailored to specific circumstances. background: Condensate pump is one of the important auxiliary equipment of thermal power plant, which consumes a lot of electric energy in the production process. Improving the efficiency of condensate pump can save energy and reduce consumption. Variable frequency operation is an effective method to improve the efficiency. However, the condensate pump is prone to excessive vibration in the process of frequency conversion operation, which affects the safe operation of the condensate pump Methods: Based on the acoustic method, the dynamic model of the rotor and inner cylinder of Jiangsu Guohua Chenjiagang Power Plant 2B condensate pump is established to compare the difference between dry modal and fluid-structure coupling modal, the influence of perpendicularity, concentricity and bearing wear on the natural frequency of rotor is studied. objective: In order to systematically understand the modal characteristics of the condensate pump rotor and inner cylinder under the fluid-structure coupling condition, a three-dimensional finite element model of the 2B condensate pump rotor and inner cylinder in Jiangsu Guohua Chenjiagang Power Plant was established. Results: The rotor is rigid under normal conditions. When the bearing is worn, the frequency of the rotor will be greatly reduced and may fall into the frequency conversion operation range to excite resonance. The deviation of perpendicularity and concentricity will not directly lead to the decrease of rotor modal but will lead to the increase of bearing stress, aggravate bearing wear, and then affect the rotor modal. As the inner cylinder only relies on the fixed support at the top, the structure stiffness is low, which may lead to low-frequency resonance. By adding two support structures at the guide vane, the first-order modal frequency of the inner cylinder can be increased from 3.29 Hz to 28.88 Hz, effectively avoiding the operating frequency range of the system. method: The fluid-structure coupling modal of the rotor was calculated based on acoustic method, and the difference between the dry modal and the fluid structure coupling modal was compared. At the same time, the influence of the rotor perpendicularity, concentricity related installation parameters and bearing wear on the modal was studied. Conclusion: This study can guide the optimization of similar pump structures. result: 1. The fluid-structure coupling modals of both the rotor and the inner cylinder are much lower than the dry modal. Compared with the dry modal, the first two orders of fluid-structure coupling modals of the rotor are reduced by 8.11%, while the first two orders of fluid-structure coupling modals of the inner cylinder are reduced by more than 25%, which is mainly caused by the additional mass of the fluid. Therefore, when conducting modal analysis, it is necessary to consider the effects of fluid forces. The frequency conversion operation range of the condensate pump is 15-25 Hz. In this operation range, there is no resonance point for the rotor, which is rigid under normal working conditions. The 3rd and 4th modals of the inner cylinder are located within the range of variable frequency operation, which may cause resonance during variable frequency operation of the condensate pump. 2. The deviation of perpendicularity and concentricity will not cause the modal frequency decrease of the rotor, on the contrary, it will cause the frequency increase of some modals. The stress on the bearing is very small when the rotor is mounted without deviation. When the perpendicularity and concentricity of the rotor is deviated, the stress on the bearing increases dramatically, thus accelerating the wear on the bearing system. The influence of different bearing wear on the rotor modal varies greatly. Generally speaking, the rotor modal will be reduced. Some have even been reduced to the frequency conversion operation range, so it can be seen that although the perpendicularity and concentricity deviation does not directly affect the modal frequency, it will accelerate the wear of the bearing, and then lead to the reduction of the modal frequency. 3. The first four modals of the inner cylinder are all below 25 Hz. By finite element calculations, it was found that after adding two supports, all modals of the inner cylinder increase above 25 Hz. other: No additional remarks provided.

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Investigation on the Changing Characteristics of Flow-Induced Noise in a Centrifugal Pump

Cited by 3 publications

References 17 publications

Optimization of the Structural Parameters of a Plastic Centrifugal Pump

Optimization of the Structural Parameters of a Plastic Centrifugal Pump

Simulation study on the flow-induced vibration and noise in marine centrifugal pumps

Modal Analysis and Optimization of Fluid-Structure Coupling for Rotor and Inner Cylinder of Vertical Condensate Pump

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