Effects of non-uniform elbow inflow on the unsteady flow and energy development characteristics of a centrifugal pump

Yuan, Ye; Fang, Yujian; Tang, Lingdi

doi:10.1063/5.0131858

Cited by 11 publications

(2 citation statements)

References 26 publications

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“…The relative vorticity transport equation [23][24][25] is introduced to analyze the inception, evolution and dissipation of blade passage vortex motion to obtain a profound understanding of the flow mechanism. The equation in the relative coordinate system is given in Equation (12).…”

Section: Flow Characteristics Under Pitch Motionmentioning

confidence: 99%

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Research on the Performance Characteristics and Unsteady Flow Mechanism of a Centrifugal Pump under Pitch Motion

Yuan,

Gong,

Wang

et al. 2023

Water

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Pitch motion is the key factor affecting the performance characteristics of centrifugal pumps on board ships and exacerbates hydraulic excitation to induce the unsteady vibration of pump units. A hydraulic test platform with swing motion is established to explore the effects of pitch motion on a pump’s performance characteristics. An obvious hump zone exists in the head characteristic curve in the low-flow-rate condition due to the pitch motion. The pump head in the shut-off condition has a significant decrease due to the pitch motion, compared to the static state. The head decrease gradually increases as the maximum pitch angle increases or the pitch period shortens. Specifically, the head in the rated flow condition decreases by 6.3 % to reach a minimum at the maximum pitch angle of 20 degrees in a period of 5 s. Based on a multiple-reference coordinate system, a large eddy simulation with a shear-modified eddy viscosity model is employed to simulate inner flow characteristics under the influence of pitch motion. A distinct vortex flow appears near the blade suction surface and becomes increasingly turbulent as the pitch period shortens. The pitch motion intensifies the unsteady stretching and deformation of vortices. The periodic variations in fluid-induced pressure over time present parabolic features, and the amplitude in the frequency domain reaches its maximum value within a pitch period of 5 s.

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Section: Flow Characteristics Under Pitch Motionmentioning

confidence: 99%

“…As the Coriolis inertial force increases, some unsteady flows, such as secondary vortex flows, appear in circular pipes [9][10][11]. This unsteady flow occurs in the inlet pipes of pumps and then forms a non-uniform flow structure before impeller inlets, which affects the performance and inner flow characteristics of pumps [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Research on the Performance Characteristics and Unsteady Flow Mechanism of a Centrifugal Pump under Pitch Motion

Yuan,

Gong,

Wang

et al. 2023

Water

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Research on performance failure caused by gas blocking in multiphase mixed-transport pump under non-uniform inflow conditions

Quan,

Wang,

et al. 2024

J Braz. Soc. Mech. Sci. Eng.

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The helical-axial multiphase mixed-transport pump fails due to gas blocking caused by gas-liquid separation caused by cavitation under complex conditions with high gas volume fraction. This is an urgent engineering problem that needs to be addressed in the application of this pump. In order to simulate the flow structure characteristics in the channel, two types of non-uniform inflow boundary conditions are introduced. The bubble structure, velocity, and pressure of the inflow conditions under different operating conditions are compared and analyzed, and the variation rules affected by the non-uniform boundary conditions are obtained. At the same time, the internal flow characteristics and mechanisms of helical-axial multiphase mixedtransport pumps are analyzed based on the velocity changes at the inlet of the impeller and the pressure fluctuations at the outlet of the diffuser, leading to the intensification of gas-liquid separation and eventually the development of gas blocking. Research has shown that through programmatic control of the inlet boundary conditions, a linear change in inlet pressure has a more significant effect on the intensification of gas-liquid separation in the flow channel of the mixed transport pump than a sinusoidal change, ultimately leading to significant performance failure when generating gas blocking. The research conclusion provides reference value for solving gas blocking in engineering applications of helical-axial multiphase mixed-transport pump.

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Effect of non-uniform inflow on the internal flow and hydrodynamic characteristics of a small modular reactor coolant pump

Long

Zhang

Guo

et al. 2023

Annals of Nuclear Energy

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Effects of non-uniform elbow inflow on the unsteady flow and energy development characteristics of a centrifugal pump

Cited by 11 publications

References 26 publications

Research on the Performance Characteristics and Unsteady Flow Mechanism of a Centrifugal Pump under Pitch Motion

Research on the Performance Characteristics and Unsteady Flow Mechanism of a Centrifugal Pump under Pitch Motion

Research on performance failure caused by gas blocking in multiphase mixed-transport pump under non-uniform inflow conditions

Effect of non-uniform inflow on the internal flow and hydrodynamic characteristics of a small modular reactor coolant pump

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