Transient Hydraulic Performance and Numerical Simulation of a Centrifugal Pump with an Open Impeller during Shutting Down

Based on CFD numerical simulation, the effect of blade thickness on hydraulic performance was studied in DQ100-64-22 stamping and welding centrifugal pump. Six types of impellers with different blade thickness were assembled in the same pump to be investigated under design condition. The result indicates that both of head and efficiency are getting lower with the increase of blade thickness. Particularly, the downward trend is more striking when the blade thickness surpasses 2mm, but pump head decreases more gently than efficiency as the blade thickness increasing within 2mm.

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Numerical simulation and experimental investigation on the influence of the clocking effect on the hydraulic performance of the centrifugal pump as turbine

Renewable Energy ◽

10.1016/j.renene.2020.12.030 ◽

2021 ◽

Vol 168 ◽

pp. 21-30

Author(s):

Guan Hongyu ◽

Jiang Wei ◽

Wang Yuchuan ◽

Tian Hui ◽

Li Ting ◽

...

Keyword(s):

Numerical Simulation ◽

Experimental Investigation ◽

Centrifugal Pump ◽

Hydraulic Performance

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Numerical Simulation and Experimental Study on Hydraulic Performance of Centrifugal Pump's Impeller Based on FINE

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.444-445.390 ◽

2013 ◽

Vol 444-445 ◽

pp. 390-394

Author(s):

Yong Shang ◽

Xiao Bing Liu ◽

Xue Jun Yu

Keyword(s):

Numerical Simulation ◽

Centrifugal Pump ◽

Flow Rate ◽

Flow Analysis ◽

Three Dimensional ◽

Hydraulic Performance ◽

Test Results ◽

Turbulent Model ◽

Three Dimensional Flow ◽

Dimensional Flow

By using the FINE software developed by NUMECA Company, the hydraulic performance of the impeller of a centrifugal pump with spatial guide vanes was numerically simulated. The S-A turbulent model was used to numerically calculate the three-dimensional flow field in the centrifugal pump under three different conditions. The flow analysis shows that the pressure gradient on the vane surface gradually reduces with the increasing of the flow rate; the position of axial vortex between vanes has nothing to do with the flow rate; the tangential flow gradient in the flow passage decreases with the increasing of the flow rate. Compared with the test results, it is obvious that this numerical simulation can accurately predicate the complicated three-dimensional flow and the hydraulic performance of the pump.

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Research on Improving the Dynamic Performance of Centrifugal Pumps With Twisted Gap Drainage Blades

Journal of Fluids Engineering ◽

10.1115/1.4042885 ◽

2019 ◽

Vol 141 (9) ◽

Cited By ~ 11

Author(s):

Zheng-Chuan Zhang ◽

Hong-Xun Chen ◽

Zheng Ma ◽

Jian-Wu He ◽

Hui Liu ◽

...

Keyword(s):

Numerical Simulation ◽

Centrifugal Pump ◽

Dynamic Characteristics ◽

Dynamic Performance ◽

Three Dimensional ◽

Hydraulic Performance ◽

Operating Conditions ◽

Navier Stokes ◽

Centrifugal Pumps ◽

Practical Applications

Through numerical simulation and experiments analysis, it is indicated that the hydraulic and anticavitation performance of a centrifugal pump with twisted gap drainage blades based on flow control theory can be significantly improved under certain operating conditions. In order to introduce the technology of gap drainage to practical applications, we put forward the parameter formulas of the twisted gap drainage blade to design three-dimensional new type blade, which are also proved to be effective for enhancing the dynamic characteristics of the centrifugal pump. Furthermore, a practical centrifugal pump is redesigned to be a twisted gap drainage impeller with the same structure size as the original impeller, and the nonlinear hybrid Reynolds-averaged Navier–Stokes (RANS)/large eddy simulation (LES) method is employed to simulate the hydraulic dynamic characteristics. Numerical simulation results show that the hydraulic performance and dynamic characteristics of the redesigned impeller centrifugal pump are significantly enhanced. In experiments, the twisted gap drainage blades structure not only remarkably improves the hydraulic performance and the pressure pulsation characteristics of the centrifugal pump but also reduces the vibration intensity.

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Experiment and simulation about the effect of wear-ring abrasion on the performance of a marine centrifugal pump

Advances in Mechanical Engineering ◽

10.1177/1687814021998115 ◽

2021 ◽

Vol 13 (2) ◽

pp. 168781402199811

Author(s):

Wu Xianfang ◽

Du Xinlai ◽

Tan Minggao ◽

Liu Houlin

Keyword(s):

Numerical Simulation ◽

Centrifugal Pump ◽

Pressure Pulsation ◽

Vibration Velocity ◽

Test Results ◽

Obvious Effect ◽

Performance Change ◽

Pump Test ◽

Simulation Results ◽

Axis Passing

The wear-ring abrasion can cause performance degradation of the marine centrifugal pump. In order to study the effect of front and back wear-ring clearance on a pump, test and numerical simulation were used to investigate the performance change of a pump. The test results show that the head and efficiency of pump decrease by 3.56% and 9.62% respectively at 1.0 Qd due to the wear-ring abrasion. Under 1.0 Qd, with the increase of the front wear-ring the vibration velocity at pump foot increases from 0.4 mm/s to 1.0 mm/s. The axis passing frequency (APF) at the measuring points increases significantly and there appears new characteristic frequency of 3APF and 4APF. The numerical simulation results show that the front wear-ring abrasion affects the flow at the inlet of the front chamber of the pump and impeller passage. And the back wear-ring abrasion has obvious effect on the flow in the back chamber of the pump and impeller passage, while the multi-malfunction of the front wear-ring abrasion and back wear-ring abrasion has the most obvious effect on the flow velocity and flow stability inside pump. The pressure pulsation at Blade Passing Frequency (BPF) of the three schemes all decrease with the increase of the clearance.

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Optimal Design of Slit Impeller for Low Specific Speed Centrifugal Pump Based on Orthogonal Test

Journal of Marine Science and Engineering ◽

10.3390/jmse9020121 ◽

2021 ◽

Vol 9 (2) ◽

pp. 121

Author(s):

Yang Yang ◽

Ling Zhou ◽

Hongtao Zhou ◽

Wanning Lv ◽

Jian Wang ◽

...

Keyword(s):

Numerical Simulation ◽

Centrifugal Pump ◽

Large Scale ◽

Internal Flow ◽

Orthogonal Test ◽

Centrifugal Pumps ◽

Initial Model ◽

Low Specific Speed ◽

Specific Speed ◽

Four Levels

Marine centrifugal pumps are mostly used on board ship, for transferring liquid from one point to another. Based on the combination of orthogonal testing and numerical simulation, this paper optimizes the structure of a drainage trough for a typical low-specific speed centrifugal pump, determines the priority of the various geometric factors of the drainage trough on the pump performance, and obtains the optimal impeller drainage trough scheme. The influence of drainage tank structure on the internal flow of a low-specific speed centrifugal pump is also analyzed. First, based on the experimental validation of the initial model, it is determined that the numerical simulation method used in this paper is highly accurate in predicting the performance of low-specific speed centrifugal pumps. Secondly, based on the three factors and four levels of the impeller drainage trough in the orthogonal test, the orthogonal test plan is determined and the orthogonal test results are analyzed. This work found that slit diameter and slit width have a large impact on the performance of low-specific speed centrifugal pumps, while long and short vane lap lengths have less impact. Finally, we compared the internal flow distribution between the initial model and the optimized model, and found that the slit structure could effectively reduce the pressure difference between the suction side and the pressure side of the blade. By weakening the large-scale vortex in the flow path and reducing the hydraulic losses, the drainage trough impellers obtained based on orthogonal tests can significantly improve the hydraulic efficiency of low-specific speed centrifugal pumps.

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Hydraulic Design of Inlet Guide Vane and its Full Flow Passage Numerical Simulation on Centrifugal Pump

Volume 7: Fluids Engineering Systems and Technologies ◽

10.1115/imece2014-36209 ◽

2014 ◽

Cited By ~ 4

Author(s):

Hucan Hou ◽

Yongxue Zhang ◽

Zhenlin Li ◽

Xin Zhou ◽

Zizhe Wang

Keyword(s):

Centrifugal Pump ◽

Flow Rate ◽

Guide Vane ◽

Hydraulic Performance ◽

Design Flow ◽

Inlet Guide Vane ◽

Hydraulic Efficiency ◽

Flow Passage ◽

Setting Angle ◽

Hydraulic Design

In order to effectively improve hydraulic performance of centrifugal pump on off-conditions, the hydraulic design of inlet guide vane (IGV) was completed by adopting two dimensional theory in-house code based on one kind of IS series of centrifugal pump, which can achieve pre-whirl regulation of centrifugal pump. During design process the trailing edge of vane is assumed as equal velocity moment condition, and the distribution of vane setting angle along meridional streamline is also given as a quartic function firstly, the camber line is then drawn by point-by-point integration method and thickened at both sides along circumferential direction. With local vortex dynamics diagnosis theory, the optimal improvement of vane space shape can be finished by adjusting the design parameters of vane setting angle distribution coefficient ap. The full flow passage numerical simulations of centrifugal pump with IGV device are completed to analyze the influence of pre-whirl regulation on hydraulic performance of centrifugal pump under various pre-whirl angles. The results show that the pre-whirl regulation can improve the hydraulic performance of centrifugal pump on off-conditions. Under the positive pre-whirl regulation conditions, the best efficient point shift to small flow rate zone, and under the negative pre-whirl regulation conditions it moves to large flow rate zone. Compared with the pump without IGV device at the same flow rate condition of 0.8Q (Q the design flow rate), the hydraulic efficiency of centrifugal pump with IGV device improves obviously and reaches up to 1.43%. Meanwhile compared with that installed with the straight vanes designed based on the traditional theory, the inner flow field of centrifugal pump with the designed vanes improves and the overall hydraulic efficiency of centrifugal pump is somewhat increased.

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