Influence of Cross-Sectional Flow Area of Annular Volute Casing on Transient Characteristics of Ceramic Centrifugal Pump

Tao, Yi; Yuan, Shouqi; Liu, Jianrui; Zhang, Fan

doi:10.1186/s10033-019-0319-9

Cited by 21 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results are in agreement with that reported in Ref. [19][20][21]. As we all know, the radial gap between impeller outlet and volute tongue exerts a great influence on the pressure fluctuation and hydraulic characteristics of the centrifugal pump.…”

Section: Introductionsupporting

confidence: 93%

Investigation on Reduction of Pressure Fluctuation for a Double-Suction Centrifugal Pump

Li²,

et al. 2021

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

Double-suction centrifugal pumps have been applied extensively in many areas, and the significance of pressure fluctuations inside these pumps with large power is becoming increasingly important. In this study, a double-suction centrifugal pump with a high-demand for vibration and noise was redesigned by increasing the flow uniformity at the impeller discharge, implemented by combinations of more than two parameters. First, increasing the number of the impeller blades was intended to enhance the bounding effect that the blades imposed on the fluid. Subsequently, increasing the radial gap between the impeller and volute was applied to reduce the rotor-stator interaction. Finally, the staggered arrangement was optimized to weaken the efficacy of the interference superposition. Based on numerical simulation, the steady and unsteady characteristics of the pump models were calculated. From the fluctuation analysis in the frequency domain, the dimensionless pressure fluctuation amplitude at the blade passing frequency and its harmonics, located on the monitoring points in the redesigned pumps (both with larger radial gap), are reduced a lot. Further, in the volute of the model with new impellers staggered at 12°, the average value for the dimensionless pressure fluctuation amplitude decreases to 6% of that in prototype pump. The dimensionless root-mean-square pressure contour on the mid-span of the impeller tends to be more uniform in the redesigned models (both with larger radial gap); similarly, the pressure contour on the mid-section of the volute presents good uniformity in these models, which in turn demonstrating a reduction in the pressure fluctuation intensity. The results reveal the mechanism of pressure fluctuation reduction in a double-suction centrifugal pump, and the results of this study could provide a reference for pressure fluctuation reduction and vibration performance reinforcement of double-suction centrifugal pumps and other pumps.

show abstract

Section: Introductionsupporting

confidence: 93%

Investigation on Reduction of Pressure Fluctuation for a Double-Suction Centrifugal Pump

Li²,

et al. 2021

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

show abstract

“…Especially when studying the flow problem of complex flow field, the use of CFD simulation technology has lower •4• cost, shorter cycle time than the solid model test, and the calculation accuracy can meet the engineering requirements, which has become an important method of flow fields analysis [22][23]. In fact, CFD simulation technology has been widely used in engineering [24][25][26]. Computational fluid dynamics models based on the Navier-Stokes equation are widely used to solve the motion characteristics of fluids in hydraulic pumps.…”

Section: Cfd Simulationmentioning

confidence: 99%

Research On The Influence Of The Piston Number On The Churning Losses In Axial Piston Pumps

Chen

Luo

et al. 2021

Preprint

View full text Add to dashboard Cite

The piston is a key rotating component in the axial piston pump, and its churning losses will reduce the performance and efficiency. To improve the performance and efficiency of the axial piston pump, a computational fluid dynamics (CFD) simulation model of churning loss was established, and the effect of piston number on the churning loss was studied in detail. The simulation analysis results show that the churning losses initially increases as the number of pistons increases. However, when the number of pistons increased from 6 to 9, the torque of churning losses began to decrease due to the hydrodynamic shadowing effect. In addition, in the analysis of cavitation results, it is found that the cavitation area of the axial piston pump is mainly concentrated around the piston, and the cavitation becomes more and more serious as the speed increases. By comparing the simulation results with and without cavitation model, it can be found that the cavitation phenomenon is beneficial to the reduction of churning losses. In this paper, a piston churning losses test rig which can eliminate other friction losses is established to verify the correctness of the simulation results. The comparative analysis shows that the simulation results are consistent with the actual situation. In addition, this study also carried out a simulation study on the 7 piston pump and the 9 piston pump with the same displacement. The simulation results show that the churning losses of 7 pistons are generally greater than that of 9 pistons under the same displacement. Besides, in the case of the same piston number and displacement, reducing the pitch circle radius of piston bores is the best way to reduce churning loss. This study has certain guiding significance for the structural design and model selection of axial piston pumps.

show abstract

“…Nouha et al [22] found that the pump dynamic behavior with the impeller geometry during the starting periods. Tao et al [23] found that the increase in the volute casing flow area is helpful to improve the operation stability of the pump. Wang et al [24] found that the valve head change during the startup process had a significant transient effect.…”

Section: Introductionmentioning

confidence: 99%

Transient Characteristics of Water-Jet Propulsion with a Screw Mixed Pump during the Startup Process

Han

Zhang

et al. 2020

Mathematical Problems in Engineering

View full text Add to dashboard Cite

In order to investigate the transient hydrodynamic characteristics of water-jet propulsion with a screw mixed pump during the startup period and to overcome the difficulties in measuring the transient process parameters over a very short period of time, a method based on a flume experiment combined with computational fluid dynamics (CFD) is proposed. The thrust and torque of the pump-jet propulsion according to mooring status at different rotational speeds were measured by the test, which provided a group of data for the boundary and initial conditions of the numerical calculation of the user-defined function (UDF). Consecutive changes in the parameters of the water-jet propulsion dynamics can be captured from the numerical simulation of the startup process with the UDF. Thus, the transient hydrodynamic characteristics of water-jet propulsion according to time or rotation speed were obtained. The results show that the relationship between the thrust or torque of the water-jet propeller and pump rotational speed is close to the quadratic functions. The energy characteristic parameters of screw mixed water-jet pump, such as the flow rate, head, shaft power, and efficiency, rapidly increase and decrease and then remain relatively stable.

show abstract

Influence of Cross-Sectional Flow Area of Annular Volute Casing on Transient Characteristics of Ceramic Centrifugal Pump

Cited by 21 publications

References 24 publications

Investigation on Reduction of Pressure Fluctuation for a Double-Suction Centrifugal Pump

Investigation on Reduction of Pressure Fluctuation for a Double-Suction Centrifugal Pump

Research On The Influence Of The Piston Number On The Churning Losses In Axial Piston Pumps

Transient Characteristics of Water-Jet Propulsion with a Screw Mixed Pump during the Startup Process

Contact Info

Product

Resources

About