scholarly journals CFD study on flow characteristics of pump sump and performance analysis of the mixed flow pump

2013 ◽  
Vol 52 (7) ◽  
pp. 072006
Author(s):  
Y X Zhao ◽  
C G Kim ◽  
Y H Lee
Keyword(s):  
Performance Analysis ◽  
Flow Characteristics ◽  
Mixed Flow ◽  
Pump Sump ◽  
And Performance ◽  
Flow Pump

Effect of Tip Clearance on Suction Performance at Different Flow Rates in a Mixed Flow Pump

2014 ◽  
Author(s):  
Yo Han Jung ◽  
Young Uk Min ◽  
Jin Young Kim
Keyword(s):  
Performance Test ◽  
Stokes Equations ◽  
Flow Characteristics ◽  
Tip Clearance ◽  
Low Flow ◽  
Tip Leakage Flow ◽  
Mixed Flow ◽  
Flow Rates ◽  
Suction Performance ◽  
Flow Pump

This paper presents a numerical investigation of the effect of tip clearance on the suction performance and flow characteristics at different flow rates in a vertical mixed-flow pump. Numerical analyses were carried out by solving three-dimensional Reynolds-averaged Navier-Stokes equations. Steady computations were performed for three different tip clearances under noncavitating and cavitating conditions at design and off-design conditions. The pump performance test was performed for the mixed-flow pump and numerical results were validated by comparing the experimental data for a system characterized by the original tip clearance. It was shown that for large tip clearance, the head breakdown occurred earlier at the design and high flow rates. However, the head breakdown was quite delayed at low flow rate. This resulted from the cavitation structure caused by the tip leakage flow at different flow rates.

scholarly journals Performance and Exit Flow Characteristics of Mixed-Flow Turbines

1997 ◽  
Vol 3 (4) ◽  
pp. 277-293 ◽  
Author(s):  
C. Arcoumanis ◽  
R. F. Martinez-Botas ◽  
J. M. Nouri ◽  
C. C. Su
Keyword(s):  
Steady State ◽  
Velocity Ratio ◽  
Tangential Velocity ◽  
Flow Characteristics ◽  
Mixed Flow ◽  
Cross Sectional ◽  
Flow Angle ◽  
Turbine Efficiency ◽  
And Performance ◽  
Inlet Angle

The performance and exit flow characteristics of two mixed-flow turbines have been investigated under steady-state conditions. The two rotors differ mainly in their inlet angle geometry, one has a nominal constant incidence (rotor B) and the other has a constant blade angle (rotor C), but also in the number of blades. The results showed that the overall peak efficiency of rotor C is higher than that of rotor B. Two different volutes were also used for the tests, differing in their cross-sectional area, which confirm that the new larger area volute turbine has a higher efficiency than the old one, particularly at lower speeds, and a fairly uniform variation with velocity ratio.The flow exiting the blades has been quantified by laser Doppler velocimetry. A difference in the exit flow velocity for rotors B and C with the new volute was observed which is expected given their variation in geometry and performance. The tangential velocities near the shroud resemble a forced vortex flow structure, while a uniform tangential velocity component was measured near the hub. The exit flow angles for both rotor cases decreased rapidly from the shroud to a minimum value in the annular core region before increasing gradually towards the hub. In addition, the exit flow angles with both rotors were reduced with increasing rotational speeds. The magnitude of the absolute flow angle was reduced in the case of rotor C, which may explain the improved steady state performance with this rotor. The results also revealed a correlation between the exit flow angle and the performance of the turbines; a reduction in flow angle resulted in an increase in the overall turbine efficiency.

A Numerical Study on the Performance Analysis of the Mixed Flow Pump for FPSO

2011 ◽  
Vol 14 (5) ◽  
pp. 12-17 ◽  
Author(s):  
Kyung-Won Kang ◽  
Young-Hun Kim ◽  
Young-Ju Kim ◽  
Nam-Sub Woo ◽  
Jae-Ki Kwon ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Numerical Study ◽  
Mixed Flow ◽  
Flow Pump

scholarly journals Effect of Rotational Speed on Performance of Mixed Flow Pump as Turbine

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Jun Chen ◽  
Tao Dai ◽  
Qing Yang
Keyword(s):  
Energy Recovery ◽  
Theoretical Calculations ◽  
Flow Characteristics ◽  
Internal Flow ◽  
High Water ◽  
Mixed Flow ◽  
High Water Period ◽  
Shaft Power ◽  
Pumped Storage ◽  
Flow Pump

In order to research the flow characteristics of mixed flow pump as turbine (MF-PAT) with different rotation speeds, a hydraulic model of mixed flow pump was established based on a pumped storage power station. The k-ε turbulent model was used to simulate internal flow fields with three rotation speeds by SMPLEC algorithms. Subsequently, theoretical calculations and experiments were carried out to verify the precision of numerical simulation. The results showed that the rotation speed of MF-PAT has a significant impact on its performance. Both numerical calculations and experimental test presented that all efficiency curves consist of ascending and descending stages, while the shaft power and head increase nonlinearly from 1000 to 2000 r/min. When the MF-PAT  deviates from the rated environment, increase in speed is positive to the energy recovery efficiency in the high water period and negative in the dry season. This work could provide a reference for further study of MF-PAT.

Design and Performance Analysis of Mixed-Flow Pumps for Waterjet Marine Propulsion

2003 ◽  
Vol 6 (2) ◽  
pp. 41-46
Author(s):  
Eui-Soo Yoon ◽  
Hyoung-Woo Oh ◽  
Jong-Woo Ahn
Keyword(s):  
Performance Analysis ◽  
Mixed Flow ◽  
Marine Propulsion ◽  
And Performance

Performance of a Mixed Flow Pump with Varying Tip Clearance: Part 1

1996 ◽  
Vol 210 (4) ◽  
pp. 305-318 ◽  
Author(s):  
T K Saha ◽  
S Soundranayagam
Keyword(s):  
Angular Momentum ◽  
Flow Field ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Flow Reversal ◽  
Tip Clearance ◽  
Mixed Flow ◽  
Three Dimensional Flow ◽  
Specific Speed ◽  
Flow Pump

Measurements of the three-dimensional flow field entering and leaving a mixed flow pump of non-dimensional specific speed k = 1.89 [ Ns = 100 r/min (metric)] are discussed as a function of flowrate. Flow reversal at inlet at reduced flows is seen to result in abnormally high total pressures in the casing region, but causes no noticeable discontinuities on the head-flow characteristics. Inlet prerotation is associated with the transport of angular momentum by the reversal eddy and begins with the initiation of flow reversal.

Interaction between Impeller and Axial Diffuser of Mixed Flow Pump

2014 ◽  
Vol 630 ◽  
pp. 35-42 ◽  
Author(s):  
Michal Varchola ◽  
Peter Hlbočan
Keyword(s):  
Internal Flow ◽  
Performance Curve ◽  
Performance Parameters ◽  
Energy Transformation ◽  
Mixed Flow ◽  
And Performance ◽  
Design Factors ◽  
Stated Problem ◽  
Important Design ◽  
Flow Pump

Topic related to an impeller - diffuser hydraulic interaction is important especially in term of energy transformation and performance parameters. A connection of particular functional parts is one of the most important design factors which determine a shape of performance parameters and efficiency. The stated problem is possible to discuss in two possible ways. In term of internal flow pattern and in term of external pump parameters which are represented by performance curve courses. The contribution deals with the influence of the change of the impeller - axial diffuser interaction on quantitative courses of specific energy and efficiency curves.

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