Numerical Investigation on the Mechanism of Double-Volute Balancing Radial Hydraulic Force on the Centrifugal Pump

Yuan, Ye; Yuan, Shouqi; Tang, Lingdi

doi:10.3390/pr7100689

Cited by 9 publications

(9 citation statements)

References 14 publications

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“…Five grid sizes are considered at the design condition to investigate the grid sensitivity [39,40]. The calculated efficiency and the head with the same numerical settings are shown in Table 3.…”

Section: Numerical Methods and Schemesmentioning

confidence: 99%

“…Frozen rotor models were set to rotor-stator interfaces, one of which was between the turbine casing and runner, and the other was between the runner and draft tube. Five grid sizes are considered at the design condition to investigate the grid sensitivity [39,40]. The calculated efficiency and the head with the same numerical settings are shown in Table 3.…”

Section: Numerical Methods and Schemesmentioning

confidence: 99%

See 1 more Smart Citation

Performance Characteristics in Runner of an Impulse Water Turbine with Splitter Blade

et al. 2021

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The impulse water turbine is a promising energy conversion device that can be used as mechanical power or a micro hydro generator, and its application can effectively ease the current energy crisis. This paper aims to clarify the mechanism of liquid acting on runner blades, the hydraulic performance, and energy conversion characteristics in the runner domain of an impulse water turbine with a splitter blade by using experimental tests and numerical simulations. The runner was divided into seven areas along the flow direction, and the power variation in the runner domain was analyzed to reflect its energy conversion characteristics. The obtained results indicate that the critical area of the runner for doing the work is in the front half of the blades, while the rear area of the blades does relatively little work and even consumes the mechanical energy of the runner to produce negative work. The high energy area is concentrated in the flow passage facing the nozzle. The energy is gradually evenly distributed from the runner inlet to the runner outlet, and the negative energy caused by flow separation with high probability is gradually reduced. The clarification of the energy conversion performance is of great significance to improve the design of impulse water turbines.

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Section: Numerical Methods and Schemesmentioning

confidence: 99%

Section: Numerical Methods and Schemesmentioning

confidence: 99%

Performance Characteristics in Runner of an Impulse Water Turbine with Splitter Blade

et al. 2021

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“…Tan [14] and Zhou [15] studied the effect of volute geometry on radial force characteristics of centrifugal pumps. Yuan [16] found the radial-forces distribute more uniformly in the double-volute pump, which can alleviate some vibrations. Hao [17] found that asymmetric tip clearance affects the size and direction of radial force, while symmetric tip clearance only affects the size of radial force.…”

Section: Introductionmentioning

confidence: 99%

Research on Influence of Rotation Center Eccentricity on Radial Force of Single-Blade Centrifugal Pump

Wang

Tan

Shi

et al. 2022

Water

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To estimate the influence of the rotation center eccentricity of the single-blade centrifugal pump impeller on the radial force on it, and to explore the effective radial force balance method, a single blade pump with a power of 2.2 kW is analyzed. The accuracy of Numerical Simulation Methods are verified by tests of external characteristics (under three rotation-speeds of 1470 r/min, 2000 r/min, and 2940 r/min) and pressure distributions. There are five models with different rotation center coordinates (model a with (0,1), model b with (−1,0), model c with (0,−1), model d with (1,0), and model e with (0,0.5)) which are analyzed. The results show that the radial force of model c and model d reduced by 8.1% and 9.8%, respectively, which means the offset of the center of the impeller to the positive direction of the x-axis and the negative direction of the y-axis can effectively reduce the radial force. At the eccentricity of the impeller (2,−2), the radial force under all operating conditions is reduced, most obviously at 1.0 Qd, which is about 17%. The study may prove helpful to designers and pump manufacturers to find a path forward for an optimal eccentricity to minimize the radial force.

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“…Fatigue fracture of large dredge pump shafts frequently occurs in engineering, but little research has been conducted on this problem. In view of the suggestion that a scientifically designed double volute can reduce the hydraulic radial force (Shi et al 2013;Kim et al 2016;Cui et al 2018;Yuan et al 2019;Zhang 2022), it would be interesting to investigate the characteristics of the corresponding total radial load and discuss the effect of the double volute in depth.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on the Unsteady Radial Load on the Shaft of a Large-Scale Dredge Pump Unit

2023

JAFM

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Vibration and fatigue damage of pump shafts has become a prominent engineering problem, indicating the need for higher-quality reliability analysis of the pump unit in the design stage. In this study, the unsteady flow field in a large centrifugal dredge pump was numerically simulated via the unsteady Reynolds-averaged Navier-Stokes (URANS) method with the SST k-ω model. An experiment was carried out to verify the numerical method. The hydraulic radial force on the impeller and the total radial load were calculated based on computational fluid dynamics. The flow field with a double volute was simulated, analyzed, and compared to the flow field with a single volute. The stress of the pump shaft caused by the radial load was also calculated and discussed. The results show that the impeller gravity determines the time-averaged value and fluctuation frequency of the total radial load on the shaft, which must be considered in the shaft stability analysis. The total radial load fluctuating in asymmetric cycle results in stress cycles with different features at different circumferential locations. The application of a double volute effectively reduces the radial load on the pump shaft, which decreases the time-averaged hydraulic radial force by 38% and its fluctuation amplitude by 3%, decreases the time-averaged total radial load by 20% and its fluctuation amplitude by 28% in the design condition, and decreases the local stress at the narrowest shaft section by 44%. A double volute can be applied to weaken vibration and fatigue damage for a pump shaft if it is acceptable for the pump efficiency to be lowered.

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Numerical Investigation on the Mechanism of Double-Volute Balancing Radial Hydraulic Force on the Centrifugal Pump

Cited by 9 publications

References 14 publications

Performance Characteristics in Runner of an Impulse Water Turbine with Splitter Blade

Performance Characteristics in Runner of an Impulse Water Turbine with Splitter Blade

Research on Influence of Rotation Center Eccentricity on Radial Force of Single-Blade Centrifugal Pump

Numerical Analysis on the Unsteady Radial Load on the Shaft of a Large-Scale Dredge Pump Unit

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