scholarly journals Influence of Channel-Diffuser Blades on Energy Performance of a Three-Stage Centrifugal Pump

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 277
Author(s):  
Wenbin Zhao ◽  
Jianbin Hu ◽  
Kai Wang
Keyword(s):  
Centrifugal Pump ◽  
Convex Surface ◽  
Internal Flow ◽  
Energy Performance ◽  
Outer Edge ◽  
Impeller Blade ◽  
Pressure Distributions ◽  
Outlet Angle ◽  
Wrap Angle ◽  
Inlet Angle

In order to improve hydraulic efficiency, influence of inlet angle, outlet angle, wrap angle, inlet shape and outer edge camber lines of channel-diffuser blades on the energy performance of a three-stage centrifugal pump were studied and the pressure distributions on the blade of the first-stage channel-diffuser were particularly analyzed. The result shows that the efficiency of the pump is maximal when the blade inlet angle is 12°. The pressure variation in the model with the inlet angle of 12° was small and the amplitude of fluctuation was also not large. When the outlet angle was 90°, the pressure distribution in the outlet of the blades that are symmetrically distributed along the center of the diffuser shell was significantly better than that with other outlet angles. The effect of the blade wrap angle of the channel-diffuser on the energy performance of the pump was relatively small. The internal flow in the diffuser with the diffusion inlet shapes was steady for both the convex surface and concave surface. The diffusion inlet of the channel-diffuser blade corresponded to the outlet region of the impeller blade, which reflected a good matching. The fluctuation amplitude and the distribution range of the models with a uniform transition were smaller than those with non-uniform transition. In order to verify the effectiveness of the research results, an experimental test was carried out on the pump. The results show that when the flow rate is 850 m3/h, the head of the pump is 138.67 m and the efficiency of pump is 69.48%.

Analysis on Effects of the Blade Wrap Angle and Outlet Angle on the Performance of the Low-Specific Speed Centrifugal Pump

2011 ◽  
Vol 354-355 ◽  
pp. 615-620 ◽  
Author(s):  
Wei Li ◽  
Wei Dong Shi ◽  
Ting Jiang ◽  
Yan Xu ◽  
Tong Tong Li
Keyword(s):  
Centrifugal Pump ◽  
Stokes Equations ◽  
Internal Flow ◽  
Navier Stokes ◽  
Outlet Angle ◽  
Study Results ◽  
Wrap Angle ◽  
Low Specific Speed ◽  
Specific Speed ◽  
Blade Wrap Angle

In order to research the effect of the blade wrap angle and outlet angle on the hydraulic performance of the low-specific speed sewage pump, the Reynolds time-averaged Navier-Stokes equations was discretized based on the finite volume method, and the modified k-ε turbulence model were chosen in FLUENT. Numerical simulation of the internal flow within the centrifugal pump with the specific speed of 60 at different blade wrap angle and outlet angle is carried out. The analysis of the velocity and the turbulent kinetic energy distribution in different cases, and predicts the external characteristics of the several cases based on the loss analysis method. The study results show that the efficiency of pumps increase with decreasing the outlet angle and increasing the wrapping angle at the design of sewage pumps. According to the analysis, changing the blade outlet Angle has much more influence on the performance of the pump than changing the wrap angle.

scholarly journals Multiparameter and Multiobjective Optimization Design Based on Orthogonal Method for Mixed Flow Fan

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2819 ◽  
Author(s):  
Honggang Fan ◽  
Jinsong Zhang ◽  
Wei Zhang ◽  
Bing Liu
Keyword(s):  
Multiobjective Optimization ◽  
Optimization Design ◽  
Pressure Rise ◽  
Internal Flow ◽  
Energy Performance ◽  
Tip Leakage Flow ◽  
Tip Leakage ◽  
Outlet Angle ◽  
Impeller Outlet ◽  
Wrap Angle

Optimization design of an impeller is critical for the energy performance of a fan. This paper takes the promotion of fan efficiency and pressure rise as the optimization objectives to carry out multiparameter and multiobjective optimization research. Firstly, an experimental test bench is built to measure the energy performance of the original fan and verify the accuracy of the numerical method. Then, the hub outlet angle of impeller β1, the impeller outlet angle increment Δβ1, the wrap angle φ, the hub outlet angle of diffuser β2, and the diffuser outlet angle increment Δβ2 are set as the optimal parameters to conduct orthogonal optimal design. The results show that the efficiency of the optimal fan increases by 11.71%, and the pressure rise increases by 50.15%. The pressure and velocity distributions in an optimal fan are uniform, the internal flow separation is weakened, and the influence of tip leakage flow is reduced, which makes for the improvement of energy performance for the fan.

scholarly journals Thermosetting Coupling Analysis and Parameter Optimization of the Plastic Lining Pump Structure

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Lingfeng Tang ◽  
Mingwei Liu ◽  
Feihong Ma
Keyword(s):  
Geometric Model ◽  
Optimum Combination ◽  
Evaluation Index ◽  
Design Parameters ◽  
Structural Parameter ◽  
Coupling Analysis ◽  
Outlet Angle ◽  
Wrap Angle ◽  
Minimum Displacement ◽  
Inlet Angle

In order to obtain the optimum structure of the lining pump under the condition of fluid thermosetting coupling, according to the given design parameters, the structural parameters of the pump were calculated, the three-dimensional geometric model was established, and the flow field analysis was carried out by CFD; the inlet angle βb1, outlet angle βb2, wrap angle φ, inlet diameter D1, and outlet diameter D2 of the impeller were selected as the five factors to design orthogonal experiment, and the results were analyzed by range analysis; then, the efficiency and cavitation allowance were obtained as combined parameters under the evaluation index. The displacement deformation and stress distribution under the condition of the coupling field were obtained by the fluid-solid coupling analysis, and the orthogonal experimental table of the impeller structure of the lining plastic pump was established, and then the orthogonal experimental results are analyzed to obtain the influence of each structural parameter under the condition of each evaluation index and the optimum combination parameters. The influence situation and the best combination parameters under the condition of evaluation index, taking the minimum displacement deformation and minimum stress of impeller as the reference index, and the optimum combination parameters under the condition of minimum displacement and stress were as follows: the inlet diameter D1 was 76 mm, the outlet diameter D2 was 252 mm, the inlet angle was 26°, the outlet angle was 24°, and the wrap angle was 115°. Finally, the 3D printing technology was used to print out the physical model to the hydraulic performance experiment verification.

Study on the Clearance of Impeller and Draft-Tube on Stamping and Welding Multistage Centrifugal Pump

2010 ◽  
Vol 43 ◽  
pp. 434-437
Author(s):  
Yuan Yi Liu ◽  
Rui Guang Li
Keyword(s):  
Centrifugal Pump ◽  
Design Theory ◽  
Stokes Equations ◽  
Draft Tube ◽  
Outer Edge ◽  
Navier Stokes ◽  
Centrifugal Pumps ◽  
Navier Stokes Equations ◽  
Pressure Distributions ◽  
Multistage Centrifugal Pump

Based on the Renault-averaged Navier-Stokes equations and a standard turbulence model, the different clearance of the outer edge on the impeller and the draft-tube is simulated by the commercial software CFX, in order to achieve optimal performance. The velocity distributions and pressure distributions within the stamping and welding multistage centrifugal pumps are analyzed. The reasonable clearance value which impact on its performance and properties have been discovered. This paper is helpful to improve the design theory of stamping and welding multistage centrifugal pumps.

scholarly journals Influence of Blade Profiles on Plastic Centrifugal Pump Performance

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Hui Zhang ◽  
Lingfeng Tang ◽  
Yongtao Zhao
Keyword(s):  
Centrifugal Pump ◽  
Volume Fraction ◽  
Interaction Analysis ◽  
Three Dimensional ◽  
Internal Flow ◽  
Logarithmic Spiral ◽  
Total Power ◽  
Impeller Blade ◽  
Pump Performance ◽  
Dimensional Models

To study the influence of blade profiles of the plastic centrifugal pump on pump performance, the impeller blade profiles were designed and drawn by the single arc method, double arc method, logarithmic spiral method, and B-spline curve method, respectively, with the known structural parameters.The shape and size of four profiles were drawn, and two-dimensional models and three-dimensional models of four impellers and volute were completed, respectively. The impeller models were printed by 3D printing technology, and the performance experiments of the plastic centrifugal pump were carried out. The numerical simulation of the internal flow field was performed. From the contours of the velocity and pressure, the vapor volume fraction distribution, and fluid-structure interaction analysis of impellers, the impeller drawn by the logarithmic spiral method was better than others. The optimization of the logarithmic spiral method was completed. The impeller inlet and outlet diameters (D1 and D2) and impeller inlet and outlet installation angles (β1 and β2) were taken as control variables, and the total power loss and the minimum NPSHr of the pump were taken as the objective functions. The optimization results were that D1 = 58 mm and D2 = 162 mm and β1 = 17° and β2 = 31°. The hydraulic efficiency was increased by 1.68%.

scholarly journals The Influence of Blade Angle on the Performance of Plastic Centrifugal Pump

2020 ◽  
Vol 2020 ◽  
pp. 1-20 ◽  
Author(s):  
Jun Li ◽  
Lingfeng Tang ◽  
Yaoyao Zhang
Keyword(s):  
Flow Field ◽  
Centrifugal Pump ◽  
Design Method ◽  
Structural Characteristics ◽  
Centrifugal Pumps ◽  
Dimensional Model ◽  
Working Pressure ◽  
Outlet Angle ◽  
Modulus Method ◽  
Inlet Angle

In order to obtain the influence of blade placement angle on the performance of plastic centrifugal pumps, this article used the velocity modulus method. Based on the method, the hydraulic design of the flow passage components of the plastic centrifugal pump was carried out, and the two-dimensional model and three-dimensional model diagram of the flow components were established. The flow field of the impeller model under different working conditions was simulated and the results were analyzed by ANSYS CFX. The influence of different fluid loads on the solid structure under design conditions on the structure characteristics of the impeller was studied by ANSYS Workbench. Impeller models with different outlet angles were established to study the influence of the outlet angle on the performance of pump, and fluid-structure interaction for different impeller models was utilized to study the influence of the outlet angle on the structural characteristics of the impeller. According to the Stepanoff velocity modulus method, considered the import prerotation, the wrap angle design method and the blade inlet angle design method were proposed. In order to study the influence of different inlet angles on the performance of pump, the inlet angle was changed to establish multiple sets of impeller models, 3D printing technology was used to print out each impeller, and performance experiments were performed on the pump equipped with the impeller. The result of the experiments showed that working pressure of plastic centrifugal pump exceeding 5 atm would cause impeller structure damage. When the outlet angle was 35°, the plastic centrifugal pump reached the highest efficiency of 81.0161% and the highest H of 35.8029. The maximum deformation caused by the flow field load on the impeller increased with the increase of the outlet angle. With the increase of the inlet angle, the efficiency and H of the plastic centrifugal pump were reduced. Under normal pressure load, the deformation of the impeller first decreased and then increased, and when β1 was 13°, the total deformation of the impeller was the smallest.

Investigation on the effect of complex impeller on vibration characteristics for a high-speed centrifugal pump

2019 ◽  
Vol 234 (5) ◽  
pp. 611-624 ◽  
Author(s):  
Ye Yuan ◽  
Shouqi Yuan ◽  
Lingdi Tang
Keyword(s):  
Centrifugal Pump ◽  
High Speed ◽  
Internal Flow ◽  
Vibration Characteristics ◽  
Water Addition ◽  
Impeller Blade ◽  
Time Frequency ◽  
Blade Passing Frequency ◽  
Experimental Apparatus ◽  
Complex Impeller

In this article, to improve the vibration characteristics of a high-speed centrifugal pump, two new types of complex impeller were designed for replacing the original long-blade impeller. The experimental apparatus of pump vibration was designed and used to test the vibration signals of the model pump with the original impeller in frequency field. The vibration amplitude of 0.12 mm/s2 is observed on the shaft rotating frequency, while the amplitudes of 0.04 mm/s2, 0.14 mm/s2, and 0.2 mm/s2 respectively on the conditions of 0.8 QN, QN, and 1.2 QN appear on the impeller blade passing frequency. The computational fluid dynamics method was used to study internal flow characteristics in the pumps with three impellers for mitigating the pump vibration. Steady pressure nephogram shows big pressure difference existed in the complex-impeller pump, which means that the complex impeller can provide the high-lift water. Addition of the splitter blade can make the pressure-fluctuation amplitude of model pump to reduce obviously by the unsteady time–frequency analyses. Furthermore, two complex impellers were machined and used to conduct the contrast experiment on the vibration characteristics between the pumps with the original impeller and complex impeller. The results reveal that the water head of pump with the complex impeller is higher than that of the original pump, which verifies the simulated results. Meanwhile, the complex impeller has a positive effect on the decrease of pump vibration on the frequency domain, especially on the blade passing frequency the vibration amplitudes decrease by 0.08 mm/s2.

Unsteady flow characteristics of energy conversion in impeller of centrifugal pump as turbine

2021 ◽  
pp. 095440622110207
Author(s):  
Senchun Miao ◽  
Hongbiao Zhang ◽  
Jiawei Zhang ◽  
Xiaohui Wang ◽  
Fengxia Shi
Keyword(s):  
Unsteady Flow ◽  
Energy Conversion ◽  
Centrifugal Pump ◽  
Time Domain ◽  
Power Loss ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Input Power ◽  
Impeller Blade ◽  
The Time Domain

To study unsteady flow characteristics of energy conversion in impeller of centrifugal pump as turbine (PAT), the overall and sub-section methods are used to calculate the unsteady flow of the PAT under six working conditions. Through numerical calculations, the net input power of the impeller, the time domain change law of the fluid's work on the impeller, the time domain change law of power loss in the impeller, and the time domain change law of energy conversion in different regions of the impeller are analyzed. Results show that: the dynamic and static interference between the impeller blades and the tongue caused the fluctuation of energy conversion; with the increase of area between the head of the impeller blade and the opposite tongue, the power loss in the impeller decreases. And when the blade head completely deviates from the position of the tongue about 10°, the power loss in the impeller is minimized. The power output of the PAT at different flow rates is related to its internal flow conditions and the geometric structure of each region of the impeller. The above research results can provide guidance on how to operate the PAT impeller stably and efficiently.

Energy Performance Prediction and Numerical Simulation Analysis for Screw Centrifugal Pump

2013 ◽  
Vol 444-445 ◽  
pp. 1007-1014 ◽  
Author(s):  
Hui Quan ◽  
Ren Nian Li ◽  
Qing Miao Su ◽  
Wei Han ◽  
Xiao Rui Cheng
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Pump ◽  
Two Phase Flow ◽  
Solid Phase ◽  
Internal Flow ◽  
Energy Performance ◽  
Phase Flow ◽  
Two Phase ◽  
Monitoring Point ◽  
The Impact

To explore the screw centrifugal pump performance change, and the impact of solid-liquid two-phase flow on the screw centrifugal pump, the internal flow of type 150×100LN-32 centrifugal pump is used as the research object. Mixture multiphase flow model, standard k-ε turbulence model and the sliding mesh technique are used to carry out the unsteady numerical simulation to describe internal flow field in screw centrifugal pump. By Setting the monitoring point to get the pressure pulsation characteristics and predict the changes in the energy performance. Open laboratory bench tests are carried out to verify the reliability of the numerical methods. Based on this, the impact of the two-phase flow on the screw centrifugal pump is analyzed. The results indicate that the head-flow curve presents a hump-shaped with the increasing of the flow. The maximum of efficiency appears. At the same time, the change of the volume concentration of the solid phase has little effect on the energy performance of screw centrifugal pump. But at different times, the head decreases and the power increases with the increasing of the concentration.

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