Experimental Study of Pressure Pulsation in a Mixed-Flow Pump with Different Tip Clearances Based on Wavelet Analysis

Ji, Leilei; Li, Wei; Shi, Weidong; Zhou, Lian; Agarwal, Ramesh K.

doi:10.1155/2020/9041686

Cited by 11 publications

(5 citation statements)

References 31 publications

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“…The transient characteristics of the impeller flow fields can be analyzed by considering the pressure pulsations in time domain or frequency domain; this approach has been proven to be effective in the unsteady flow analysis of mixed-flow pumps. [40][41][42][43][44] In this study, the time domain and frequency response of pressure pulsations at different monitoring points in the impeller tip region located at the inlet, middle and outlet of the impeller are analyzed. The transient flow features of the mixed-flow pump for various tip clearances are compared.…”

Section: Time Domain Analysis Of Impeller For Different Tip Clearancesmentioning

confidence: 99%

Transient characteristics of internal flow fields of mixed-flow pump with different tip clearances under stall condition

Shi

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper investigates the influence of different tip clearances on the transient characteristics of mixed-flow pump under stall condition. The instantaneous internal flow fields of mixed-flow pump with four tip clearances (0.2 mm, 0.5 mm, 0.8 mm and 1.1 mm) are explored by conducting unsteady time accurate simulations. Reynolds-averaged Navier-Stokes (RANS) equations are employed in the simulations and the results of computations are compared with experimental data. The results show that the pump head decreases by 22.1% and the pump efficiency drops by 13.9% at design flow condition when the impeller tip clearance increases from 0.2 mm to 1.1 mm. The swirling flow occurs in the inlet pipe of the mixed-flow pump with different tip clearances under stall condition, and the initial starting point of the swirling flow gets further away from the impeller inlet with increase in tip clearance because of increase in circumferential velocity and change in momentum of the tip leakage flow (TLF). The high turbulent eddy dissipation (TED) regions in the flow are attributed to the TLF, swirling flow, back flow and stall vortex, and their intensity are affected by the change in tip clearance. The oscillating trend of time domain distribution of TED enhances first and then decreases with increase in tip clearance and it exhibits a propagation feature under the effect of stall vortex, while most of the energy in the frequency domain remains concentrated in the low frequency part under stall condition.

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Section: Time Domain Analysis Of Impeller For Different Tip Clearancesmentioning

confidence: 99%

Transient characteristics of internal flow fields of mixed-flow pump with different tip clearances under stall condition

Shi

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Jin Yan [13] analyzed the pressure pulsation of different parts of the submersible pump and derived the corresponding pulsation law. Ji Leilei [14] used a combination of model expeshroudents and numerical simulations to study the mechanism of the influence of blade tip clearance on pump internal leakage and pressure pulsation. The study proved that changing the size of blade tip clearance can lead to the generation of gap leakage and leakage vortices, leading to a decrease in unit performance.…”

Section: Introductionmentioning

confidence: 99%

Study on the pulsation and fluid-structure coupling characteristics of rotating parts of vane type mixed-flow pump

Jin,

Xue,

Tang

2024

J. Phys.: Conf. Ser.

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Vane type mixed flow pumps (VTMFP) are widely used in water conservancy engineering, with a wide range of head applications. The impeller is the core component of the pump unit, and its internal flow and hydraulic excitation force affect the safe and stable operation of the unit. Aiming the pulsation characteristics inside the impeller, the VTMFP under different conditions is studied to examine the deformation and stress distribution by CFD, and the simulated results agree with the test data. The simulated results indicate that the impeller blade passing frequency consistently dominates the impeller inlet under various operating conditions. Furthermore, it is observed that the impeller rotating parts experience the highest levels of stress and deformation at low flow rate. The distribution of the equivalent force decreases from the hub to the shroud, while the deformation displacement decreases from the impeller shroud to the hub. In light of these findings, it is recommended that the design process takes into consideration the stress concentration near the blade root and the deformation at the blade edge.

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“…The flow characteristics of the pump device and the flow state of the fluid in the pump have a great influence on its operational reliability and performance stability. Pressure pulsation is one of the main causes of vibration and noise in pump devices, and some scholars have carried out studies on the internal pressure pulsation characteristics of pump devices of different structural forms (Chu et al, 1995;Li et al, 2018;Ji et al, 2020;Yang et al, 2021a). Li et al (2021) examine the cavitation performance of an LNG submerged pump and the pressure pulsation characteristics during cavitation excitation using CFD analytical technologies.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the internal flow and pressure pulsation characteristics of a submersible tubular electric pump device

Ding²,

Liu³

et al. 2023

Front. Energy Res.

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In order to clarify the non-constant flow characteristics of the impeller and bulb body of the submersible tubular electric pump device, the entire flow rate conduit of the pump device is numerically calculated using the numerical simulation method, focusing on the analysis of the non-constant flow field characteristics of the guide vane body and bulb body and the time–frequency variation law of the pressure pulsation, and the results of the physical model testing confirm the validity of the numerical simulation. The findings demonstrate that the impeller of a submersible tubular electric pump is mostly responsible for the impeller’s inlet pressure pulsation, and the number of impeller blades to the number of peaks and valleys is consistent. Under the high flow rate condition of 1.2 Qd, the pressure fluctuation in the impeller inlet, between the impeller and the guide vane is small, and the main frequency is located at three times the rotational frequency, and the pressure pulsation at the outlet of the guide vane body has no obvious pattern and small amplitude. As the flow rate increases, the peak value of pressure pulsation at each monitoring point in the characteristic section of the pump device gradually decreases. The pressure pulsation peak value varies widely, ranging from 0.058 to 0.15, at each monitoring location of the impeller inlet. The peak value of pressure pulsation at each monitoring point of the impeller outlet fluctuates less due to the change of flow rate. The size and scale of the omega vortex structure in the guide vane body at different moments of the same cycle is small, and the number of vortex structures from the guide vane body inlet to the outlet direction shows a gradual increase in the trend; with a rise in flow rate, there is a tendency for the velocity and deflection angle of the guide vane body outlet and bulb body outlet surface to decrease.

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Experimental Study of Pressure Pulsation in a Mixed-Flow Pump with Different Tip Clearances Based on Wavelet Analysis

Cited by 11 publications

References 31 publications

Transient characteristics of internal flow fields of mixed-flow pump with different tip clearances under stall condition

Transient characteristics of internal flow fields of mixed-flow pump with different tip clearances under stall condition

Study on the pulsation and fluid-structure coupling characteristics of rotating parts of vane type mixed-flow pump

Numerical analysis of the internal flow and pressure pulsation characteristics of a submersible tubular electric pump device

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