Design and Test for High Specific Speed Mixed Flow Pump with Volute

2011 ◽  
Vol 354-355 ◽  
pp. 669-673
Author(s):  
Xian Fang Wu ◽  
Hou Lin Liu ◽  
Ming Gao Tan ◽  
Hong Hui Li
Keyword(s):  
Cross Sections ◽  
Flow Analysis ◽  
Maximum Efficiency ◽  
Blade Angle ◽  
Mixed Flow ◽  
Commercial Code ◽  
Hydraulic Design ◽  
Velocity Circulation ◽  
Specific Speed ◽  
Flow Pump

The characteristics and research actuality on mixed flow pumps are introduced simplely. A mixed flow pump with volute as diffusion part is designed and its specific speed is 556.8. The axial velocity circulation and blade angle variety with linearity distribution are used to deisign the impeller. The fixed diffeuser between impeller and volute is deigned by arc airfoil.The cross sections of volute are all asymmetry. The commercial code FLUENT is applied to simulate the inner flow in the mixed flow pump and its energy characteristics are predicted according to the simulation results. The inner flow analysis indicates that the flow in the pump is good and the characteristic prediction shows that the pump performance can meet the design demand. The experiment test of the pump are done. When the blade angle is about 0°, the maximum efficiency of the pump is up to 85.76% and the actual efficiency at design point is about 3% higher than demand efficiency. The study fruits can instruct the hydraulic design of higher specific speed mixed flow pump with volute as diffusion part.

Numerical Analysis of Design and Off-Design Performance of High Specific Speed Mixed Flow Pumps

2011 ◽  
Author(s):  
Yumiko Sekino ◽  
Yoichi Tanabe
Keyword(s):  
Steady Flow ◽  
Periodic Boundary ◽  
Flow Analysis ◽  
Flow Patterns ◽  
Design Flow ◽  
Cfd Analysis ◽  
Mixed Flow ◽  
Blade Passage ◽  
Specific Speed ◽  
Flow Pump

In most cases of high specific speed mixed flow pump applications, it is necessary to control off-design performance such as shutoff power/head and unstable characteristic as well as design point performance. The authors have been working on multi-objective optimization strategy of mixed flow pump design considering off-deign performance by means of Computational Fluid Dynamics (CFD). In the design optimization process, it was found that the steady CFD analysis using one pitch blade passage adopting periodic boundary condition could be used for relative comparison of the important performance characteristics such as the level of efficiency, the shutoff performance and the stall characteristics of different designs. However, the steady CFD analysis with one pitch blade passage showed that absolute values of head and shaft power were estimated lower than those of the experimental results especially in the partial capacity range. In order to improve the accuracy of CFD results it should be necessary to use full pitch model. In this paper, the evaluation results of three CFD approaches on the capability of the performance prediction of the mixed flow pumps will be shown. The approaches evaluated are steady flow analysis with one pitch blade passage using periodic boundary conditions, full pitch steady flow analysis and unsteady flow analysis. It was found from the evaluation results that the full pitch steady flow analysis showed the same tendency as one pitch analysis and the unsteady CFD provided higher accuracy of the shutoff head. However, the steady analysis should still be useful to reduce the high computational cost and the amount of time. Meanwhile the unsteady analysis clarifies the details of the off-design flow patterns. The effects of the turbulence models and the details of the off-design flow patterns were also discussed in this paper.

Circulation Distribution of High Specific Speed Mixed-Flow Pump

2011 ◽  
Vol 130-134 ◽  
pp. 1982-1985
Author(s):  
Chun Lin Wang ◽  
Chang Jun Li ◽  
Jian Ding ◽  
Dong Liu
Keyword(s):  
Pressure Distribution ◽  
Guide Vane ◽  
Low Pressure ◽  
Effective Area ◽  
Maximum Efficiency ◽  
Mixed Flow ◽  
Pressure Area ◽  
Circulation Distribution ◽  
Specific Speed ◽  
Flow Pump

The load distribution of the impeller and the shape of blade bone surface as well as the pump performance are determined by the circulation distribution from the impeller inlet to the outlet. However, perfect conclusions about optimal forms of the circulation distribution have not been seen yet. In this paper, three kinds of circulation distributions were studied. Three mixed flow pump impellers with high specific speed were designed according to the circulation distributions, and the models of the three pumps were built and modeled in the commercial CFD code ANSYS-CFX 11.0. The flow field in the pumps has been investigated using large eddy simulation (LES). Experiment was carried out on one model. And the performance curves predicted by LES were compared with the experimental data, and good agreements were achieved. The results show that: there is a low pressure area at impeller outlet. The pressure distribution along the circumferential direction was asymmetry at the front-end area of guide vanes, but it becomes uniform at the end of guide vane. The bearing pressure on the pressure side of the model 2 is lower, and the pressure distribution of model 1 is more asymmetry and there is a clear low pressure area at outlet of blade; Cavitation performance of model 2 is better, and the maximum efficiency is also the highest, but the hump is more serious; Model 1 has a widest area of high effective area.

Performance of a Mixed Flow Pump with Varying Tip Clearance: Part 2

1996 ◽  
Vol 210 (4) ◽  
pp. 319-327 ◽  
Author(s):  
S Soundranayagam ◽  
T K Saha
Keyword(s):  
Close Agreement ◽  
Tip Clearance ◽  
Pump Efficiency ◽  
Centrifugal Pumps ◽  
Mixed Flow ◽  
Loss Distribution ◽  
Specific Speed ◽  
Flow Pump ◽  
Relative Flow

Measurements in a mixed flow pump of non-dimensional specific speed k = 1.89 [ NS = 100 r/min (metric)] are analysed to give loss distribution and local hydraulic efficiencies at different flowrates and values of tip clearance. Fairly close agreement is obtained between the relative flow angles leaving the blading as predicted by simple deviation and slip models and derived from the measurements. The head developed is broken up into two parts: that contributed by Coriolis action and that associated with blade circulation. It is suggested that lift coefficients based on blade circulation are of limited value in selecting blade profiles. The variation of pump efficiency with tip clearance is greater than that reported for centrifugal pumps.

Evaluation of Blade Passage Analysis Using Coarse Grids

2000 ◽  
Vol 122 (2) ◽  
pp. 345-348 ◽  
Author(s):  
Steven M. Miner
Keyword(s):  
Rotational Speed ◽  
Stokes Equations ◽  
Axial Flow ◽  
Measured Data ◽  
Flow Coefficient ◽  
Design Parameters ◽  
Mixed Flow ◽  
Specific Speed ◽  
Coarse Grids ◽  
Flow Pump

This paper presents the results of a study using coarse grids to analyze the flow in the impellers of an axial flow pump and a mixed flow pump. A commercial CFD code (FLOTRAN) is used to solve the 3-D Reynolds Averaged Navier Stokes equations in a rotating cylindrical coordinate system. The standard k−ε turbulence model is used. The meshes for this study use 22,000 nodes and 40,000 nodes for the axial flow impeller, and 26,000 nodes for the mixed flow impeller. Both models are run on a SPARCstation 20. This is in contrast to typical analyses using in excess of 100,000 nodes. The smaller mesh size has advantages in the design environment. Stage design parameters for the axial flow impeller are, rotational speed 870 rpm, flow coefficient ϕ=0.13, head coefficient ψ=0.06, and specific speed 2.97 (8101 US). For the mixed flow impeller the parameters are, rotational speed 890 rpm, flow coefficient ϕ=0.116, head coefficient ψ=0.094, and specific speed 2.01 (5475 US). Evaluation of the models is based on a comparison of circumferentially averaged results to measured data for the same impeller. Comparisons to measured data include axial and tangential velocities, static pressure, and total pressure. A comparison between the coarse and fine meshes for the axial flow impeller is included. Results of this study show that the computational results closely match the shapes and magnitudes of the measured profiles, indicating that coarse CFD models can be used to accurately predict performance. [S0098-2202(00)02202-1]

scholarly journals Unstable Performance of a Low Specific Speed Mixed Flow Pump (1st Report, a Diffuser Rotating Stall Behavior)

2006 ◽  
Vol 72 (722) ◽  
pp. 2481-2487
Author(s):  
Masahiro MIYABE ◽  
Akinori FURUKAWA ◽  
Hideaki MAEDA ◽  
Isamu UMEKI ◽  
Yoshinori JITTANI
Keyword(s):  
Rotating Stall ◽  
Mixed Flow ◽  
Low Specific Speed ◽  
Specific Speed ◽  
Flow Pump

High performance hydraulic design techniques of mixed-flow pump impeller and diffuser

2015 ◽  
Vol 29 (1) ◽  
pp. 227-240 ◽  
Author(s):  
Sung Kim ◽  
Kyoung-Yong Lee ◽  
Joon-Hyung Kim ◽  
Jin-Hyuk Kim ◽  
Uk-Hee Jung ◽  
...  
Keyword(s):  
High Performance ◽  
Mixed Flow ◽  
Pump Impeller ◽  
Hydraulic Design ◽  
Flow Pump ◽  
Design Techniques
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