The Role of Blade Sinusoidal Tubercle Trailing Edge in a Centrifugal Pump with Low Specific Speed

Li, Bowen; Li, Xiaojun; Jia, Xiaoqi; Feng, Chen; Fang, Hua

doi:10.3390/pr7090625

Cited by 21 publications

(13 citation statements)

References 52 publications

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“…Among the two-equation turbulence models, the turbulence model can better simulate the turbulent flow that is fully developed away from the wall surface. The turbulence model has a wider application to solve the boundary layer involved in problems under various pressure gradients and is widely recognized in engineering [18][19][20]. The control equations are as follows: Among the two-equation turbulence models, the k − ε turbulence model can better simulate the turbulent flow that is fully developed away from the wall surface.…”

Section: Calculating Models and Methodsmentioning

confidence: 99%

Numerical Study on the Influence of Inlet Guide Vanes on the Internal Flow Characteristics of Centrifugal Pump

Lin

et al. 2020

Processes

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In order to make the centrifugal pump run efficiently and stably under various working conditions, the influences of the incoming vortex flow in the inlet pipe on the main flow in the impeller is studied numerically, based on the k − ω SST turbulence model. Some guide vanes with different offset angle were added to change the statistical characteristic of the internal flow in the inlet pipe of the centrifugal pump. Both contour distributions of internal flow and statistical results of external performance are obtained and analyzed. The results show that the existence of vanes can divide the large vortex because of the reversed flow from the rotating impeller at low flow rate conditions into small vortices, which are easier to dissipate, make the velocity and pressure distribution more uniform, improve the stability of the flow in the impeller, reduce the hydraulic loss, and improve the hydraulic performance of the pump. The pump with vanes of offset angle 25° has a small pressure pulsation amplitude at each monitoring point. Comparing with the performance of the original pump, the head increased by around 2% and efficiency increased by around 2.5% of the pump with vanes of offset angle 25°.

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Section: Calculating Models and Methodsmentioning

confidence: 99%

Numerical Study on the Influence of Inlet Guide Vanes on the Internal Flow Characteristics of Centrifugal Pump

Lin

et al. 2020

Processes

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“…The LES turbulence model is used for transient simulation because it can accurately capture the vortex removal from the blade trailing edge. The results of steady-state calculations of the SST k-ω turbulence model are used to compare and analyse the performance of centrifugal pumps with different blade trailing edges [21,26]. The calculation medium is water, where density ρ = 998.2 kg/m 3 , and dynamic viscosity μ = 0.001006 Pa•s.…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

“…Dimensionless coefficient C p of pressure is used to study the pressure pulsation of centrifugal pumps with different blade trailing edges. The specific formula of static pressure coefficient C p is expressed as follows [21]:…”

Section: Analysis Of Unstable Pressure Pulsationsmentioning

confidence: 99%

“…They believed that the trailing edge with large radius could effectively improve the speed distribution of the impeller outlet. Li et al [21] studied the influences of sinusoidal tubercle trailing edge (STTE) impeller on the unstable pressure pulsation of centrifugal pumps and concluded that the STTE impeller can reduce the pressure pulsation amplitude. Luo et al [22] investigated the mechanism of wake loss reduction for biomimetic trailing edge and concluded that the wake area for the biomimetic trailing edge case is narrow, and the velocity in the wake recovers more quickly compared with the situations in the three other cases.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Cutting Angle of Blade Trailing Edge on Unsteady Flow in a Centrifugal Pump Under Off-Design Conditions

Cui

Zhang

et al. 2020

Applied Sciences

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The parameters of blade trailing edge have an important influence on the performance of centrifugal pump and internal unstable flow. In this study, the influences of cutting angles of blade trailing edge on unstable pressure pulsation and unstable flow structure are investigated using a centrifugal pump under off-design conditions through large eddy simulation. Three typical blade trailing edges, namely, original trailing edge (OTE), 15° cutting angle of blade trailing edge (OBS15) and 30° cutting angle of blade trailing edge (OBS30), are analysed. Results show that the cutting angle of blade trailing edge has a certain effect on the performance of the centrifugal pump. Under part-load conditions, the OBS30 impeller evidently contributes to the reduction in pressure pulsation intensity. By contrast, the OBS15 impeller has opposite effect because of the increase in wake vortex intensity. The OBS30 impeller can effectively improve the unstable vortex structure caused by backflow at the centrifugal pump tongue using a new Ω method. Consequently, reduction in the unstable flow structure mainly contributes to the reduction in pressure pulsation used by the proper cutting angle of blade trailing edge.

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“…20 Li et al discussed the influence of blade trailing edge shape on pressure pulsation, and used the bionic method to optimize the design of trailing edge. 21 Zhang et al proved that the pressure pulsation in the pump can be reduced by cutting the blade. 22 These studies suggest that the shape and position of the flow passage component in the pump will affect the pressure pulsation.…”

Section: Introductionmentioning

confidence: 99%

Effect of vaned diffuser clocking position on hydraulic performance and pressure pulsation of centrifugal pump

Guan

Jiang

Wang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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The clocking position of the vaned diffuser, the circumferential position of the vaned diffuser relative to the volute, has a certain effect on the performance of the centrifugal pump. Therefore, this paper studies the guide vane centrifugal pump from the aspects of pressure pulsation, hydraulic performance, and energy loss. The maximum difference in efficiency is 3.4% under the design flow rate, and the maximum difference in the head coefficient is 4.7%. The hydraulic performance and pressure pulsation present different trends with the increase of the vaned diffuser clock angle. When the hydraulic performance and pressure pulsation are relatively good, the circumferential distance between the tongue and the upstream vaned diffuser blade is 3/4 of the diffuser flow path. In addition, the recommended vaned diffuser installation location may also be suitable for centrifugal pumps of similar construction. The energy loss was visualized using the theory of entropy production. The distributions of energy loss and flow field indicate that the energy loss of impeller and vaned diffuser changes little. The change of the vortex in the tongue and outlet area will cause a significant change in the energy loss of the volute, which is the main reason that the hydraulic performance of the centrifugal pump is affected by the clocking position of the vaned diffuser.

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The Role of Blade Sinusoidal Tubercle Trailing Edge in a Centrifugal Pump with Low Specific Speed

Cited by 21 publications

References 52 publications

Numerical Study on the Influence of Inlet Guide Vanes on the Internal Flow Characteristics of Centrifugal Pump

Numerical Study on the Influence of Inlet Guide Vanes on the Internal Flow Characteristics of Centrifugal Pump

Influence of Cutting Angle of Blade Trailing Edge on Unsteady Flow in a Centrifugal Pump Under Off-Design Conditions

Effect of vaned diffuser clocking position on hydraulic performance and pressure pulsation of centrifugal pump

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