Effect of Reflux Hole on the Transient Flow Characteristics of the
                        Self-Priming Sewage Centrifugal Pump

Zhou, Peijian; Wu, Ziyan; Mou, Jiegang; Wu, Denghao; Zheng, Shi-Yi; Gu, Yunqing

doi:10.29252/jafm.12.03.29207

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…Six impellers with different inlet blade angles were designed for numerical simulation and research was conducted, obtaining the optimal inlet angle of the blades, which provided a theoretical basis for improving the performance of single-blade centrifugal pumps. Zhou et al [5] suggested that the reflux holes of self-priming centrifugal pumps have a significant impact on pump performance. To study the specific influencing mechanism, four groups of reflux holes with different areas were arranged for transient numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Research on the Flow Characteristics of Power-Law Fluids in Self-Priming Sewage Pumps

Li,

Zheng,

Shao

et al. 2024

Water

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To conduct a more in-depth study of the flow mechanism of power-law fluids within sewage pumps, this paper focuses on self-priming sewage pumps, with typical power-law fluid (Carboxymethyl Cellulose, CMC) as the conveying medium. The constitutive equations for sewage and typical power-law fluid (CMC solution) were established using the power-law model. Through numerical calculation methods, the non-steady flow field inside the pump of different concentration power-law fluids was analyzed from various aspects such as velocity, pressure, vorticity, and wall shear stress. The pressure pulsations at key locations in the pump flow field were monitored and analyzed. At the rated flow rate, when the concentration of CMC solution increased from 0.5% to 2.0%, the channel pressure and tongue pressure decreased by 16.5% and 3.5%, respectively. This indicates that the pressure on the impeller blades, within the flow passages, and at the tongue of the volute all decrease with the increase in concentration of CMC solution. This may alter the fluid flow pattern, leading to more vortex motion and shear deformation, while also reducing the pump’s pressure boosting capability, thereby affecting the pump’s performance stability. It can be inferred from quantitative comparisons that changes in rheological properties had a significant impact on the flow characteristics of sewage pumps. This paper reveals that some flow characteristics of power-law fluids in sewage pumps, providing a theoretical and reference basis for the performance optimization and flow mechanism research of sewage pumps.

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Section: Introductionmentioning

confidence: 99%

Research on the Flow Characteristics of Power-Law Fluids in Self-Priming Sewage Pumps

Li,

Zheng,

Shao

et al. 2024

Water

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“…Wang et al [18] numerically simulated the non-constant flow field inside a cyclone self-priming pump using a large vortex simulation method and found that the maximum pressure pulsation value inside the vortex occurs in the volute channel inside the tongue area of the guide wall, which is biased towards the direction of rotation of the impeller. Zhou et al [19] studied external hybrid self-priming pumps with different reflux hole areas and analyzed the effect of reflux hole area on their pressure pulsation characteristics. The results showed that the intensity of pressure fluctuations at the monitoring points near the reflux holes is generally greater than the others and decreases with the decrease in the reflux hole area.…”

Section: Introductionmentioning

confidence: 99%

Pressure Pulsation Characteristics of a Self-Priming Pump under Typical Operating Conditions

Zhao,

Li,

Zhang

et al. 2024

Processes

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To investigate the pressure pulsation characteristics of self-priming pumps under different flow conditions, Fluent 19.2 software was used to numerically calculate the internal flow inside a self-priming pump by means of the RNG k-ε model. The pressure pulsation characteristics, as well as the standard deviation in the volute and impeller domains, were analyzed under different flow conditions. As a result, under rated- and high-flow conditions, the monitoring points in the volute channel have obvious periodic patterns, and the peak pressure pulsations all occur in the octave band of the blade frequency. The pressure pulsation amplitude is larger under the high-flow condition than in the other two conditions. The monitoring points L1 and L5 on the impeller channel centerline are located near the impeller’s inlet and outlet, respectively, so the pressure pulsations are larger than other monitoring points.

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“…Mou et al [7] numerically simulated the self-priming pump process under four different return areas and found that the flow in the pump cavity became complex due to the existence of vortices. Zhou et al [8] studied the effect of reflux hole area on the pressure pulsation characteristics and performance of self-priming pumps during normal operation. They pointed out that the vorticity near the outlet of the reflux hole is significant, and the asymmetric flow structure in the cross-section moves periodically with time.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on the Effect of the Backflow Hole Position on the Performances of a Self-Priming Pump

Wang,

Cao,

Wang

et al. 2024

FDMP

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A self-priming pump is a centrifugal pump that has the ability to prime itself. Typically, its performance depends on the configuration of its reflux hole. In this study, the ANSYS FLUENT software is used to investigate the effects of three different radial positions of the reflux hole on gas-liquid two-phase distribution, pressure pulsation, and imp during self-priming. The research results indicate that: (1) The effective channel size for the reflux liquid to enter the volute varies depending on the location of the reflux hole. The effect of the impeller rotation on the reflux liquid becomes more obvious as the setting distance of the reflux aperture decreases. (2) The position of the reflux hole significantly affects the gas phase mass fraction inside the impeller, resulting in a significant reduction in the time it takes for the mass fraction to exceed 80%. (3) The position of the reflux hole significantly affects the average pressure on each monitoring surface. (4) Placing the reflux hole at a excessively distant radial distance can result in an excessive vertical component. (5) The self-priming performance of the pump can be improved to some extent by placing the return hole at a small radial distance.

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Effect of Reflux Hole on the Transient Flow Characteristics of the Self-Priming Sewage Centrifugal Pump

Cited by 7 publications

References 12 publications

Research on the Flow Characteristics of Power-Law Fluids in Self-Priming Sewage Pumps

Research on the Flow Characteristics of Power-Law Fluids in Self-Priming Sewage Pumps

Pressure Pulsation Characteristics of a Self-Priming Pump under Typical Operating Conditions

A Numerical Study on the Effect of the Backflow Hole Position on the Performances of a Self-Priming Pump

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