Numerical Study on Pressure Pulsation in a Slanted Axial-Flow Pump Device under Partial Loads

Yang, Fan; Chang, Pengcheng; Hu, Wenzhu; Mao, Beibei; Liu, Chao; Li, Zhongbin

doi:10.3390/pr9081404

Cited by 12 publications

(15 citation statements)

References 16 publications

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“…Here, the determination coefficient (R2), root mean squared error (RSME) and mean absolute error (MAE) were applied to verify this assumption [52]. The expressions for the RSME and MAE performance metrics are listed as Equations ( 10) and (11). From the above external and force characteristic curves, we can observe an obvious correlation between SG speed and the maximum values of the performance parameters of turbine mode.…”

Section: Comparison Of Force and Moment Characteristicsmentioning

confidence: 97%

Section: Comparison Of Force and Moment Characteristicsmentioning

confidence: 99%

“…In urban drainage pump stations, axialflow pumps have been widely used because of their relatively simple structure and good performance with a low head section. Among the vertical, horizontal and slanted axialflow pumps, slanted axial-flow pumps (SAFPs) have been increasingly adopted by urban drainage pump stations, since they are more economical to construct, more convenient to maintain and superior in operation performance, by virtue of their extraordinarily simple and compact structure [11]. A few studies have been conducted on it.…”

Section: Introductionmentioning

confidence: 99%

“…In order to reveal the reason for flow deviation in the s-shaped flow passage in a SAFP, Wang et al [15] carried out numerical calculations in a 15 • model and observed the detailed flow mechanism. To find out the reason that resulted in impeller damage and vortex in a SAFP, Yang et al [11] performed numerical calculation to study the pressure fluctuations under different flow rates. While the slanted structure of a SAFP will lead to some specific motion characteristics that influence the pump's safety, nonetheless, the aforementioned research has not mentioned this.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Modeling of the Hydrodynamic Performance of Slanted Axial-Flow Urban Drainage Pumps at Shut-Off Condition

et al. 2022

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Increasing extreme rainfall events caused by global climate change have had a significant impact on urban drainage systems. As a critical component of a pumping station, a large-scale slanted axial-flow pump (SAFP) featuring high specific speed plays a critical role in mitigating urban flooding and waterlogging. In this study, to reveal the transient characteristics of a SAFP at shut-off conditions, a computational fluid dynamics (CFD) based approach with dynamic mesh was proposed. Multiple shut-off conditions with various shut-down speeds of the sluice gate (SG) were modeled. Our analysis demonstrated that both the shut-off conditions and the slanted structure have conspicuous impacts on the hydrodynamic performance of a SAFP. Reducing the shut-down speed leads to a greater reverse flow rate and higher runner speed. The water hammer effect was simulated with different shut-down speeds, increasing the water head by 5.07–10.42 m, the axial force by 163.46–297.06 kN∙m, and the axial moment by 116.05–224.01 kN∙m. Compared with the axial direction, moments in the radial directions were found with more obvious oscillation as a result of stronger rotor–stator interaction. Due to the gravitational effect of the slanted structure, the fluctuation of the runner in vertical direction presented an off-axis characteristic compared with the horizontal one. As the SG speed increased, pressure fluctuations gradually decreased at various locations across the SAFP.

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Section: Comparison Of Force and Moment Characteristicsmentioning

confidence: 97%

Section: Comparison Of Force and Moment Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Modeling of the Hydrodynamic Performance of Slanted Axial-Flow Urban Drainage Pumps at Shut-Off Condition

et al. 2022

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“…Svoboda et al 18 analyzed the flow of viscous liquid in highly efficient commercial axial pumps. Yang et al 19 used the time–frequency domain analysis method to analyze the pressure pulsation of each flow structure of the 30° slanted axial-flow pump device. Yang et al 20 studied the influence of different deflection angles on the internal flow characteristics and outlet pulsation characteristics of the inlet passage of the vertical axial flow pump.…”

Section: Introductionmentioning

confidence: 99%

Analysis of internal flow characteristics and structure optimization of vertical submersible axial flow pump device

Yang

Lin

Li³

et al. 2022

Advances in Mechanical Engineering

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In order to investigate the internal flow characteristics and hydraulic stability of vertical submersible pump station in forward and reverse operation, the steady and unsteady three-dimensional numerical simulation of vertical submersible axial-flow pump device was carried out based on CFD and the energy performance of the pump device was predicted. In this paper, the internal flow characteristics of the vertical submersible axial-flow pump device under forward and reverse operation were analyzed, and the optimization of the structure passed by water was carried out to improve the efficiency of the pump device in forward and reverse operation. The results show that the performance of the pump device is good when it is running in the forward direction, the peak efficiency of the pump device is 72.22% and the corresponding head is 4.01 m. When it is running in the reverse direction, the performance of the pump device decreases significantly with the peak efficiency is only 36.03% and the corresponding head is 3.34 m. The hydraulic loss in the dust-pan-shaped conduit is very small in the forward operation, the wellbore conduit is the main factor which affects the efficiency of the submersible axial flow pump device, the loss ratio is 12%–44%. When the pump device is in reverse operation, the hydraulic loss is similar but the hydraulic performance is poor and the hydraulic loss is obviously larger than that in forward operation. A guide plate is added to the dust-pan-shaped conduit at 0.27 D ( D is the nominal diameter of impeller) along the axis direction of the conduit, and a elbow flow conduit with the corner radius R of 0.83 D is selected to replace the wellbore conduit, the bad flow state disappeared and the efficiency of the pump device increased by 5.19% in the forward operation while the efficiency of the pump device increased by 9.62% in the reverse operation.

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Time–frequency signal analysis of flow pulsation in siphon outlet conduit based on HHT considering the pump‐conduit interaction

Yang

Lin

Ding

et al. 2023

Energy Science & Engineering

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The unsteady three‐dimensional numerical simulation calculation of the vertical axial flow pump device is performed based on CFD to examine the pressure pulsation and energy distribution features of the water flow within the siphon outlet conduit (SOC) under the hydraulic coupling of the pump and the flow conduit. The pressure pulsation signals (PPS) of monitoring points are decomposed using the Hilbert–Huang approach via empirical mode decomposition (EMD) and Hilbert spectrum analysis. The results show that the PPS of monitoring points of the SOC has no obvious periodicity. The low‐frequency range below 20 Hz serves as the primary frequency, and the energy ratio of the high‐frequency signal above 700 Hz is less than 1%. Under the condition of a small flow rate 0.3Qbep, there is obvious high‐frequency pulsation above 500 Hz at the inlet of the upstream section of the SOC, and there are periodic components distributed around 200 Hz. The energy of the pressure pulsation is primarily focused in the low‐frequency range below 40 Hz at the SOC outlet section. The PPS at the top and bottom monitoring points of the hump section are consistent, and the pressure pulsation energy (PPE) is mainly concentrated in the low frequency below 40 Hz. In both the big flow condition (1.2Qbep) and the optimal flow condition (1.0Qbep), the PPE of the monitoring points at the top of the hump section is distributed in the middle and low‐frequency band below 40 Hz, and the energy of monitoring points at the bottom of the hump section is concentrated in the low‐frequency band below 20 Hz, accounting for more than 70%. When the flow rate increases from 0.3Qbep to 1.2Qbep, the peak value of the pressure pulsation coefficient at the main frequency of each monitoring point at the top of the hump section changes little, and the peak value of the pressure pulsation coefficient at the main frequency of each monitoring point at the bottom increases first and then decreases. From the upstream section to the hump section of the SOC, the average frequency of each intrinsic mode function (IMF) of the PPS under different flow conditions shows an overall increasing trend. From the hump section of the SOC to its outlet, the average frequency of each IMF of the PPS decreases under the conditions of 1.0Qbep and 1.2Qbep, and there is no obvious change under the condition of 0.3Qbep.

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Numerical Study on Pressure Pulsation in a Slanted Axial-Flow Pump Device under Partial Loads

Cited by 12 publications

References 16 publications

Numerical Modeling of the Hydrodynamic Performance of Slanted Axial-Flow Urban Drainage Pumps at Shut-Off Condition

Numerical Modeling of the Hydrodynamic Performance of Slanted Axial-Flow Urban Drainage Pumps at Shut-Off Condition

Analysis of internal flow characteristics and structure optimization of vertical submersible axial flow pump device

Time–frequency signal analysis of flow pulsation in siphon outlet conduit based on HHT considering the pump‐conduit interaction

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