Flow induced noise characterization of pump turbine in continuous and intermittent load rejection processes

Mao, Xiuli; Pavesi, Giorgio; Chen, Diyi; Xu, Hengshan; Mao, Gaojun

doi:10.1016/j.renene.2019.02.116

Cited by 32 publications

(3 citation statements)

References 16 publications

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“…The explanation for this phenomenon was that the noise was induced by the flow instabilities, which included the backflow and rotating stalls at partial load conditions, and was radiated by the cavitation under the overload conditions in the pump. It was proposed that flow-induced noise radiation is consistent with internal fluid characteristics, as in Mao's research [35]. Meanwhile, the intensity of the backflow in the pump inlet pipe gradually weakened as the flow rate increased.…”

Section: Root Mean Square (Rms) Of the Noisementioning

confidence: 72%

Investigation of the Noise Induced by Unstable Flow in a Centrifugal Pump

Liu

Zeng

et al. 2020

Energies

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In order to investigate the mechanism and the characteristics of the noise induced by unstable flow in a centrifugal pump, the internal flow characteristics in the pump were numerically researched, and the acoustic pressure fluctuations at the pump inlet and outlet were experimentally investigated. Obvious corresponding relationships between the flow instabilities, the cavitation and the noise were established. It was found that the rotating stall, the backflow, the hump, the occurrence of unstable flow and the cavitation in such a centrifugal pump were effectively detected through the noise, which could help to provide fundamental information on flow instabilities and guarantee safe and steady operating conditions for the system. The recirculation and prewhirl regions in the pump upstream pipe, which were caused by the backflow and the rotation of the impeller, presented the circumferential movement with a spiral shape, causing apparent broadband fluctuations at low frequency band of the acoustic pressure. The backflow and rotating stall could also result in broadband fluctuations of the pump outlet noise, which was distributed from 100 Hz to 150 Hz. Meanwhile, the broadband fluctuations of the pump outlet acoustic pressure distributed in the low frequency range, which was produced by the occurrence of cavitation, moved to the lower frequency band as the flow rate increased. The enhanced broadband fluctuations of the pump inlet and outlet noise distributed from 1 kHz to 6 kHz were caused by the coupling between the cavitation-induced noise and the system-produced noise. The broadband fluctuations of the pump inlet noise distributed between 6 kHz and 9 kHz were regarded as the typical frequency band of cavitation in the centrifugal pump.

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Section: Root Mean Square (Rms) Of the Noisementioning

confidence: 72%

Investigation of the Noise Induced by Unstable Flow in a Centrifugal Pump

Liu

Zeng

et al. 2020

Energies

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“…At present, the improvement of computational fluid dynamics (CFD) technology has facilitated the related researches, and the numerical model combining the CFD and Lighthill acoustic analogy theory [8,9] has been widely adopted for noise simulations. Based on the numerical model, Yang et al [10], Si et al [11] and Mao et al [12] analyzed the noise directivity distribution characteristics in circumferential direction. It was revealed that the noise showed dipole symmetric distribution characteristics.…”

Section: Introductionmentioning

confidence: 99%

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

Li¹,

Sun²,

Wang³

et al. 2021

Fluid Dynamics &Amp; Materials Processing

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Centrifugal pumps are widely used in engineering for a variety of applications. A known drawback of these devices is the high-level noise generated during operations, which can affect their stability and adversely influence the entire working environment. 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. Additionally, under various rotational speeds with the design flow rate (Condition 1), the TSSI and TSPL at pump inlet and outlet are higher than those obtained with the opening of the valve kept unchanged (Condition 2); vice versa when these two parameters are evaluated at various locations in the impeller and the volute under the Condition 2, they exceed the equivalent values obtained for the other Condition 1.

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“…Keller et al [14] obtained the influence of different acoustic impedances of the suction side on the pressure fluctuations at the pump by using the matrix formulation acoustic model. Mao et al [15] combined the detached eddy simulation (DES) method and the acoustic boundary element method involved in software LMS to predict the flow-induced noise characterization of pump turbines during a transient load rejection process and intermittent vane closing conditions. The above research mainly focuses on fluid borne noise and dipole source around volute cut-off.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study on the Flow-Induced Noise Characteristics of High-Speed Centrifugal Pumps

Shen

et al. 2020

Applied Sciences

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The development of low-noise pumps is essential to design quiet fluid delivery systems. Due to the complicated internal flow, the flow-induced noise characteristics of high-speed centrifugal pumps have not been well understood. Taking engine cooling pumps as an example model, experimental measurements are performed in a semi-anechoic room and a CFD/CFA calculation method is proposed to study the fluid-borne noise and radiated noise characteristics. In the speed range of 5000–6750 r/min, both the pump head and the dimensionless radiated noise characteristics conform to similar laws, and the highest efficiency point pump presents the lowest noise level. Consistent with the experimental results, the predicted radiated noise of the model pump presents dipole characteristics at the required flow rate condition. Moreover, the spectrum of fluid borne noise at pump outlet shows broadband characteristics but with obvious discrete peaks, which are not only related to the fluid pressure pulsation characteristics (6f0 and the multiple) at the low-frequency region, but also to the frequency of the structural mode (3000–6000 Hz region). Rotor-stator interaction of the pump flow field between the impeller and volute is the main reason of flow-induced noise; unstable flow also contributes to the broadband components in the noise spectrum.

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Flow induced noise characterization of pump turbine in continuous and intermittent load rejection processes

Cited by 32 publications

References 16 publications

Investigation of the Noise Induced by Unstable Flow in a Centrifugal Pump

Investigation of the Noise Induced by Unstable Flow in a Centrifugal Pump

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

Numerical and Experimental Study on the Flow-Induced Noise Characteristics of High-Speed Centrifugal Pumps

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