Clocking effect of outlet RGVs on hydrodynamic characteristics in a centrifugal pump with an inlet inducer by CFD method

Zhang, Xiang-Yuan; Jiang, Chenxing; Lv, Shen; Xi, Wang; Yu, Tao; Jian, Jie; Shuai, Zhi-Jun; Li, Wanyou

doi:10.1080/19942060.2021.1871961

Cited by 21 publications

(10 citation statements)

References 27 publications

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“…The commercial computational fluid dynamics (CFD) software ANSYS CFX 17.0 was utilized to analyze the continuity and momentum equations for the internal flow of the pump. The turbulence was simulated using the SST k-w model [37][38][39][40]. In terms of the boundary conditions, a total pressure of 2 kPa was specified at the inlet, a mass flow rate condition of 30.5 kg/m 3 was set at the outlet, and no-slip conditions were applied to the other wall surfaces.…”

Section: Methodsmentioning

confidence: 99%

“…The comparison between the experimental data and simulation results for the hydraulic performance of the centrifugal pump is illustrated in Figure 7a. The head of the pump represents the capacity of the pump to work [40]; it is defined as…”

Section: Experimental Validationmentioning

confidence: 99%

“…The dimensionless flow rate Φ [40], the dimensionless head Ψ , and the pressure coefficient P C can be defined as, respectively:…”

Section: Experimental Validationmentioning

confidence: 99%

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Influence of the Trailing Edge Shape of Impeller Blades on Centrifugal Pumps with Unsteady Characteristics

Song,

Chen,

et al. 2024

Processes

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The flow field structure and pressure pulsation characteristics in two series of trailing edges of a centrifugal pump are investigated using the SST k-w turbulence model. Series 1 involves varying the impeller exit angle, and Series 2 involves varying the impeller exit shape. The entropy generation rate analysis method is used to evaluate the numerical simulation results. Vortex cores within the flow field are identified by applying the Ω criterion. The influence of different trailing edge configurations on the energy loss characteristics of the pumps is explored. The dynamic mode decomposition (DMD) method is used to analyze pressure pulsations at the volute considering unsteady flows in centrifugal pumps with different trailing edge shapes. The findings suggest that different trailing edge shapes can be used to adjust the energy loss proportions in various components of the pump. In Series 1, the efficiency remains nearly constant with changes in the outlet angle on both sides of the trailing edge. In Series 2, the efficiency is enhanced by 1.18% with the elliptical edge shape on both sides (EBS) compared to the original trailing edge (OTE) shape. In Series 1 and Series 2, greater entropy generation rates are accompanied by greater pressure pulsations at the pump outlet. The DMD results demonstrate a noticeable impact of the different trailing edges on the pressure distribution of various modes within the volute. Moreover, the impeller outlet pressure inhomogeneity coefficient changes under different modes. This study holds great significance for selecting the appropriate trailing edges for centrifugal pumps.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Validationmentioning

confidence: 99%

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Influence of the Trailing Edge Shape of Impeller Blades on Centrifugal Pumps with Unsteady Characteristics

Song,

Chen,

et al. 2024

Processes

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“…In recent years, the advanced development of computer technology allows the dynamic flow conditions inside hydraulic pumps to be solved numerically using powerful CFD methods. [21][22][23] In the following sections, we will establish an accurate 3D-CFD model to investigate the pump cavitation and then analyze the temperature effects on it.…”

Section: Machine Descriptionmentioning

confidence: 99%

Cavitation in a high-speed aviation axial piston pump over a wide range of fluid temperatures

Chao

Tao

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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The axial piston pump in aerospace applications needs to operate over a wide range of fluid temperatures from −54°C to 135 °C. The fluid properties at such extreme temperatures will significantly affect the cavitation that is one of the major limiting factors for the efficiency and reliability of aviation axial piston pumps. However, it appears that very little of the existing literature studies the effects of extreme fluid temperatures on the pump cavitation. This paper aims to examine the temperature effects on the cavitation in an aviation axial piston pump. First, we develop a three-dimensional (3D) transient computational fluid dynamics (CFD) model to investigate the pump cavitation and validate it experimentally. Second, we use the validated CFD model to investigate the temperature effects on the pump cavitation by changing the fluid properties including viscosity, density, and bulk modulus. The numerical results show that low fluid temperature makes the aviation axial piston pump suffer serious cavitation due to high viscosity, leading to delivery flow breakdown, unacceptable pressure pulsation, and delayed pressure built up. In contrast, high fluid temperatures have minor effects on the cavitation although they increase the pressure pulsation and built-up time slightly.

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“…The clocking effect also has a significant impact on the frequency and amplitude of pressure fluctuations because pressure pulsation not only depends on the interaction between the rotor and the stator but also on the interaction between the diffuser and tongue. Jiang et al, 21 Zhang et al 22 studied the influence of diffuser vanes on the operational performance and flow characteristics of centrifugal pumps through experiments and numerical simulations. The results showed that when the trailing edge of the vane was close to the tongue, the efficiency reached its minimum value, and the radial force on the impeller reached its maximum value.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of clocking effect on unsteady fluid flow in vicinity of tongue for centrifugal pump with vaned diffuser

Zhu,

Qiao,

Xie

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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In order to investigate the clocking effect on unsteady flow distortion in the vicinity of the tongue and hydraulic loss in the volute, experiments and numerical simulations were conducted with four different relative angular positions between the vane and tongue. Numerical results were validated against experimental data, which included measurements of pressure pulsation at the tongue and downstream of the tongue. The radial and circumferential velocities near the tongue at the diffuser-volute clearance were depicted by expanding the rotating surface, and comparisons were made under different diffuser positions to reveal the flow distortion affected by the clocking effect. Shear stress rates and total pressure distributions at the volute exit pipe were also depicted to study the flow loss in the volute affected by the flow pattern from the tongue. The findings show that the pressure fluctuation at the tongue and downstream of the tongue is significantly affected by the diffuser mounting position. The amplitude and intensity of pressure pulsation under θ d1 are clearly smaller than those at other diffuser positions. As the vane trailing edge approaches the tongue, the pressure gradient becomes very large, leading to the formation of a vortex at the tongue that promotes crowding effects and reverse flow occurring in the exit pipe. This, in turn, leads to deflection of the main flow in the volute, high velocity gradients, and subsequently large shear stress rates and hydraulic losses. When the diffuser is installed at θ d4, the flow distortion and flow loss are improved.

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Clocking effect of outlet RGVs on hydrodynamic characteristics in a centrifugal pump with an inlet inducer by CFD method

Cited by 21 publications

References 27 publications

Influence of the Trailing Edge Shape of Impeller Blades on Centrifugal Pumps with Unsteady Characteristics

Influence of the Trailing Edge Shape of Impeller Blades on Centrifugal Pumps with Unsteady Characteristics

Cavitation in a high-speed aviation axial piston pump over a wide range of fluid temperatures

Numerical investigation of clocking effect on unsteady fluid flow in vicinity of tongue for centrifugal pump with vaned diffuser

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