Numerical analysis of pressure pulsation in vertical submersible axial flow pump device under bidirectional operation

Yang, Fan; Chang, Pengcheng; Li, Chao; Shen, Qiangru; Qian, Jun; Li, Jindong

doi:10.1063/5.0063797

Cited by 5 publications

(3 citation statements)

References 34 publications

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“…In order to clarify the force variation of the impeller in the calculation condition, the axial force (F Z ) and radial force (F R ) of the impeller are calculated (Yang et al, 2022b). The calculation formulas of axial force and radial force are as follows:…”

Section: Unsteady Flow Characteristics In the Impellermentioning

confidence: 99%

Numerical Analysis of Unsteady Internal Flow Characteristics of Impeller-Guide Vane in a Vertical Axial Flow Pump Device

Yang

Chang

Jian³

et al. 2022

Front. Energy Res.

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A vertical axial flow pump device has the characteristics of low head and large flow and has various forms, simple structure, and flexible installation. It is widely used in low-head pumping stations in plain areas. In order to explore the transient characteristics of the internal flow in the impeller and guide vane of the vertical axial flow pump at different flow rates, this article analyzes the internal flow field distribution on the surface of the impeller blade, the velocity and pressure distribution of the impeller inlet and outlet, and the pressure pulsation characteristics of the impeller. The flow field characteristics of the guide vane section, the entropy production loss, and the main frequency change of the pressure pulsation inside the guide vane are analyzed at different radii. The results show that under 0.8 Qbep condition, the streamline distortion area of the blade working face accounts for the largest part of the blade area, and the streamline distortion area of the blade surface decreases significantly at 1.2 Qbep. The circumferential pressure distribution at the impeller inlet presents four high-pressure regions and four low-pressure regions, and the number of regions is consistent with the number of impeller blades. The ratio of axial force to flow rate of 0.8Qbep, 1.0Qbep, and 1.2Qbep is approximately 11:10:9. The radial force on the impeller is the largest under the condition of 0.8 Qbep, and the radial force on the impeller is not significantly different between 1.0 Qbep and 1.2 Qbep. The pressure pulsation amplitude gradually decreases from the inlet to the outlet of the guide vane.

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Section: Unsteady Flow Characteristics In the Impellermentioning

confidence: 99%

Numerical Analysis of Unsteady Internal Flow Characteristics of Impeller-Guide Vane in a Vertical Axial Flow Pump Device

Yang

Chang

Jian³

et al. 2022

Front. Energy Res.

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“…The instantaneous pressure must be dimensionless in the time domain analysis process to remove static pressure disturbance. The pulsating pressure coefficient ( C p ) was used by references 42,50 to analyze time series data. The C p was calculated statistically on all grids inside the turbine’s flow domain to aid in the identification of places with exceptionally unsteady flows.…”

Section: Numerical and Experimental Frameworkmentioning

confidence: 99%

Numerical and experimental investigation of 3D unsteady flow fields of a low head axial flow turbine under different blade number

Yang

Ohiemi

Singh

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Low-head axial flow turbines (LHAFT) are important turbomachines suitable for converting low-head water (potential energy) into mechanical (kinetic) or electrical energy. The performance characteristics of this kind of turbine are an essential aspect of its design and operational life cycle. Nevertheless, pressure fluctuations within the turbine affect its operational reliability. Hence its fluctuation characteristics cannot be overlooked due to its influence on vibration, noise, and severity of performance. It is essential to investigate the zones associated with high unsteadiness and turbulence. Furthermore, blade number and variation in flow rate are other important, influential factors on the level of pressure fluctuations. Given the above, numerical and experimental investigation of pressure fluctuation intensities within the flow channels of the LHAFT model under different blade numbers was carried out in this study. The results posit that the pulsating pressure coefficient decreases gradually from the inflow to the guide vane but increases at the runner, then falls as the flow progresses in the outlet pipe. At the runner, the flow experienced the most irregular flow patterns in the turbine. All three runner cases were operated with nine guide vanes, but after one complete revolution, blade numbers z = 2, 3, and 4 revealed regular pressure fluctuations, respectively, in the stationary part (guide vane, inlet and outlet pipes). Regardless of the case study, nine (9) regular peaks and valleys of pressure pulses matching the number of vanes on the static vane were recorded in the runner flow passage. The flow interaction between the static vane and runner is responsible for the pressure fluctuation, which influences the turbine’s vibration and noise. The obtained results would be an essential reference to noise and vibration analytical studies in turbines to optimize them for improved operational reliability.

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“…Recently, with the rapid growth of meshing techniques [8], numerical algorithms [9], and post-processing methods [10], the investigation of the internal pressure pulsation of axial-flow pumps based on computational fluid dynamics (CFD) has made remarkable progress [11,12]. Yang et al [13] found that rotor-stator interference between the impeller and guide vanes is one of the most important inductors for strong pressure pulsation inside the axial-flow pump.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Transient Characteristics of a Vertical Axial-Flow Pump with Non-Uniform Suction Flow

Meng

Qin

et al. 2022

Machines

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The aim of this paper is to study the influence of non-uniform suction flow on the transient characteristics of a vertical axial-flow pump device. The unsteady calculation is employed to forecast the unstable flow structure with three inlet deflection angles α, and the calculation accuracy under uniform inlet flow is verified by the external characteristic test. The results depict that a promotion in the α will increase the head and shaft power and thus improve the stress and fatigue failure risk of the impeller. At the impeller inlet, the pressure pulsation intensity (PPI) with α = 40° is lower than that with α = 0° caused by a decline in the axial velocity. The dominant frequency of the unsteady pressure signal is the blade-passing frequency (BPF), and the dominant frequency amplitude rises with the increase in α due to the improvement of the pre-rotation impact intensity. At the guide vanes inlet, the dominant frequency of the unsteady pressure signal at the guide vane inlet is also the blade-passing frequency. An improvement in α magnifies the angle between the trailing edge jet of the impeller and the leading edge of the guide vanes under 0.8Qdes and 1.0Qdes, while it diminishes the angle under 1.2Qdes. Thus, the PPI and dominant frequency amplitude with α = 40° are higher than that with α = 0° under 0.8Qdes and 1.0Qdes, but these are lower than that with α = 0° under 1.2Qdes.

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Numerical analysis of pressure pulsation in vertical submersible axial flow pump device under bidirectional operation

Cited by 5 publications

References 34 publications

Numerical Analysis of Unsteady Internal Flow Characteristics of Impeller-Guide Vane in a Vertical Axial Flow Pump Device

Numerical Analysis of Unsteady Internal Flow Characteristics of Impeller-Guide Vane in a Vertical Axial Flow Pump Device

Numerical and experimental investigation of 3D unsteady flow fields of a low head axial flow turbine under different blade number

Investigation of Transient Characteristics of a Vertical Axial-Flow Pump with Non-Uniform Suction Flow

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