Numerical Simulation and Flow Field Measurement of High Efficiency Axial-Flow Pump

2009 ◽  
Author(s):  
De-sheng Zhang ◽  
Wei-dong Shi ◽  
Bin Chen ◽  
Xing-fan Guan
Keyword(s):  
Rotor Blade ◽  
Radial Direction ◽  
High Efficiency ◽  
Static Pressure ◽  
Axial Flow ◽  
Rotor Blades ◽  
Experimental Results ◽  
Meridional Velocity ◽  
Axial Flow Pump ◽  
Flow Pump

In order to analyze the flow characteristics of a high efficiency axial-flow pump, the behavior of the flow in an adjustable axial-flow pump bas been analyzed by numerical simulations of the entire stage based on Fluent software. The prediction data shows agreement with the experimental results. Numerical results show that the static pressure on pressure side of rotor blades increases slightly at radial direction, and remains almost constant in circumferential direction at design conditions, while it increases gradually from inlet to exit on suction side along the flow direction. The static pressure, total pressure and velocity at inlet, rotor blade exit and stator outlet were measured by five-hole probe. The experimental results show, inlet flow is almost axial and the prerotation is very small at design conditions. The meridional velocity and circulation distributions are almost uniform at rotor blades exit at design condition. The residual circulation still exists at downstream of stator, and the absolute flow angle at radial direction is almost consistent at design conditions, but Cu increases linearly from hub to tip at small flow rate conditions. To determine the influence of the hub leakage, a contrast experiment was accomplished. The measurement results show that hub leakage results in the decrease of efficiency, and the meridional velocity and circulation at rotor blade exit, especially near hub leakage region are influenced by the leakage.

scholarly journals Improvement of the Efficiency of the Axial-Flow Pump at Part Loads due to Installing Outlet Guide Vanes Mechanism

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Fan Yang ◽  
Hao-ru Zhao ◽  
Chao Liu
Keyword(s):  
Prediction Model ◽  
Flow Rate ◽  
High Efficiency ◽  
Guide Vane ◽  
Axial Flow ◽  
Hydraulic Performance ◽  
Operating Conditions ◽  
Ann Model ◽  
Axial Flow Pump ◽  
Flow Pump

In order to investigate the influence of adjustable outlet guide vane on the hydraulic performance of axial-flow pump at part loads, the axial-flow pump with 7 different outlet guide vane adjustable angles was simulated based on the RNG k-ε turbulent model and Reynolds time-averaged equations. The Vector graphs of airfoil flow were analyzed in the different operating conditions for different adjustable angles of guide vane. BP-ANN prediction model was established about the effect of adjustable outlet guide vane on the hydraulic performance of axial-flow pump based on the numerical results. The effectiveness of prediction model was verified by theoretical analysis and numerical simulation. The results show that, with the adjustable angle of guide vane increasing along clockwise, the high efficiency area moves to the large flow rate direction; otherwise, that moves to the small flow rate direction. The internal flow field of guide vane is improved by adjusting angle, and the flow separation of tail and guide vane inlet ledge are decreased or eliminated, so that the hydraulic efficiency of pumping system will be improved. The prediction accuracy of BP-ANN model is 1%, which can meet the requirement of practical engineering.

403 On Rotor Performance and Blade-to-Blade Static Pressure Distribution in Contra-Rotating Axial Flow Pump

2001 ◽  
Vol 2001 (0) ◽  
pp. 119-120
Author(s):  
Akinori FURUKAWA ◽  
Yinchun CAO ◽  
Kusuo OKUMA ◽  
Takahiro CHONO ◽  
Satoshi WATANABE
Keyword(s):  
Pressure Distribution ◽  
Static Pressure ◽  
Axial Flow ◽  
Static Pressure Distribution ◽  
Axial Flow Pump ◽  
Flow Pump

Experimental Study on Cavitating Flow in Impeller of Axial-Flow Pump

2011 ◽  
Author(s):  
Zhong Li ◽  
Minguan Yang ◽  
Can Kang ◽  
Bo Gao ◽  
Kai Ji
Keyword(s):  
Rotation Axis ◽  
Axial Flow ◽  
Leading Edge ◽  
Cavitating Flow ◽  
Experimental Results ◽  
Suction Surface ◽  
Cavitation Bubbles ◽  
Cavitation Region ◽  
Axial Flow Pump ◽  
Flow Pump

Based on the external characteristic test, the performance of designed axial-flow model pump was determined. The cavitation performance of model pump at the best efficiency point was confirmed through the cavitation test. The cavitating flows in impeller at different NPSH values were shot by the high speed digital camera. MiVnt image analysis software was utilized to process the shooting images, track the cavitation region and outline of cavitation bubbles cluster. The experimental results show that the incipient cavitation regions are located in the inlet of blade suction surface near the tip and the leading edge of tip airfoil. With the decrease of NPSH values, the cavitation region at tip airfoil moves gradually from leading edge to trailing edge and the type of cavitation is vortex cavitation, its rotation axis direction is the same as circumferential direction. The cavitation region at blade suction surface indicates the same moving trend as at tip airfoil. The emerging of cloudy cavitation at the middle of blade suction surface indicates the beginning of pump cavitation. With the further increase of volume proportion of cavitation bubbles in impeller channel, the pump performance decreases severally. The experimental results reveal the preliminary laws of cavitating flow and provide an effective reference for the cavitation region and development process in impeller of axial-flow pump.

A Hydraulic Design Procedure of Axial-Flow Pump

2015 ◽  
Author(s):  
Zhenhua Shen ◽  
Svend Rasmussen ◽  
Xiaofen Ma ◽  
Christian Brix Jacobsen
Keyword(s):  
High Efficiency ◽  
Guide Vane ◽  
Axial Flow ◽  
Design Procedure ◽  
Visual Basic ◽  
Cnc Machining ◽  
Pump Design ◽  
Hydraulic Design ◽  
Axial Flow Pump ◽  
Flow Pump

A radical decrease of the product development time has been achieved by implementation of simulation driven development on axial-flow pump design. A new automatic hydraulic design procedure of axial-flow pumps was developed. It consists of in-house developed parametric design template, Visual Basic macro, OpenFOAM and an in-house developed pump performance plot tool. In this procedure the parametric template includes propeller design and guide vane design. A mesh is generated by using OpenFOAM snappyHexMesh utility. Visual Basic macro is used to link the parametric template and OpenFOAM. In order to validate the accuracy of predicting the hydraulic performance from this procedure, a high specific speed axial-flow pump was designed by using this procedure and an in-house optimization tool. Finally an aluminum scaled prototype was made by CNC machining. The CFD results show that BEP efficiency is equal to 83.5%, and testing shown BEP efficiency of 85%. It indicates that the hydraulic design from this procedure is both reliable and able to produce high efficiency designs.

Performance Prediction and Experimental Verification of Axial Flow Pump Based on CFD

2012 ◽  
Vol 152-154 ◽  
pp. 1566-1571
Author(s):  
De Sheng Zhang ◽  
Guang Jian Zhang ◽  
Wei Dong Shi ◽  
Tong Tong Li
Keyword(s):  
Flow Field ◽  
Flow Rate ◽  
Performance Prediction ◽  
Prediction Error ◽  
Axial Flow ◽  
Maximum Error ◽  
Experimental Results ◽  
Complex Flow ◽  
Axial Flow Pump ◽  
Flow Pump

The full flow field numerical simulation of the axial-flow pump model is carried out to predict the pump performance based on RNG k-ε model and SIMPLE algorithm and the method of calculating head and efficiency. The numerical results show that the head and efficiency prediction curves have a good agreement with the experimental results. In the optimal operating condition, the prediction error of head is 0.04% and the efficiency error is 0.39% which could meet the requirements of engineering applications. The prediction error based on RNG k-ε turbulence model is larger in the off-design condition owing to the complex flow field of axial-flow pump. The predicted head is lower than the experimental results in the small flow rate conditions and its maximum error is 5.12%, while is higher than the experimental data in the large flow rate conditions and its maximum error is 17.39%. The conclusions will provide the basis and reference for the performance prediction of axial-flow pumps based on CFD.

Test Research on the New Electromechanical Axial-Flow Pump with Advantages of Small Vibration and Noise

2012 ◽  
Vol 605-607 ◽  
pp. 267-270
Author(s):  
Bing Fang ◽  
Qi Dou Zhou ◽  
Jian Bo Xie ◽  
Ming Zhong Qiao
Keyword(s):  
High Efficiency ◽  
Axial Flow ◽  
Performance Tests ◽  
Noise Levels ◽  
Vibration Acceleration ◽  
Small Vibration ◽  
Airborne Noise ◽  
Design Value ◽  
Axial Flow Pump ◽  
Flow Pump

For the vibration and noise of conventional axial-flow pumps being oppressive, a new electromechanical axial-flow pump with advantages of small vibration and noise had been designed, which integrated the impeller into drive electromotor by combining the rotor of motor and the blade of impeller. The new electromechanical axial-flow pump not only had small size and high efficiency, but also can greatly reduce vibration and noise by taking off the drive axis of pump. Performance tests had been done for the pump and results showed that the efficiency and head were very close to design value. Vibration and noise tests had also been done, results showed that vibration acceleration levels on the feet of pump base could be less than 110dB and airborne noise levels could be less than 75dB, which would be smaller than conventional axial-flow pumps.

Stall inception phenomena in a single-stage axial-flow pump

2003 ◽  
Vol 217 (4) ◽  
pp. 471-479 ◽  
Author(s):  
I Goltz ◽  
G Kosyna ◽  
U Stark ◽  
H Saathoff ◽  
S Bross
Keyword(s):  
Axial Flow ◽  
Wall Pressure ◽  
Operating Conditions ◽  
Single Stage ◽  
Rotor Blades ◽  
Tip Clearance ◽  
Stall Inception ◽  
Oil Flow ◽  
Axial Flow Pump ◽  
Flow Pump

The paper describes an experimental investigation on stall inception phenomena in a single-stage axial-flow pump, utilizing an oil flow technique and two different photo techniques. Moreover, the unsteady casing wall pressure was measured. Representative results are shown and discussed: the pump characteristic for two different NPSH values, selected oil flow pictures of the casing wall and the rotor blades, the wall pressure distribution at design, selected pictures of the cavitating core of the tip clearance vortex at stable and unstable operating conditions and the visualization of a cross-passage vortex as a deep stall phenomenon. These results allow a number of key features of the stall inception process to be identified and to be followed along the unstable part of the pump characteristic.

Analysis of Common Axial-Flow Pump Under Reverse Operation

2014 ◽  
Author(s):  
Pengfei Ma ◽  
Jun Wang
Keyword(s):  
Numerical Method ◽  
Pressure Fluctuation ◽  
Static Pressure ◽  
Operation Mode ◽  
Axial Flow ◽  
Rotation Direction ◽  
Axial Pump ◽  
Pump Station ◽  
Axial Flow Pump ◽  
Flow Pump

A direct reverse changing of the rotation direction can be a reverse operation mode for bi-directional pump station. However, research in this area was rarely conducted due to several reasons. In this paper, an axial-pump was designed by lifting method, of which approximate specific speed was 1250. The external performances, inner flow properties and pressure fluctuation characteristics of the pump were analyzed by numerical method, in both positive and reverse operation. The effectiveness of numerical method was verified by the existing experiment data of bi-directional axial-pump. The results show that the static pressure variation of the inner channel, during positive and reverse operation, is similar. However, the static pressure in the blade surface is obviously different in that the low pressure area in the back moves to the central part of the blade under reverse operation. The maximum value of amplitude occurs near to the inlet edge. Besides, the main frequencies of the pressure fluctuation in each monitoring points are multiple or equal to the blade passing frequency in both positive and reverse operation. This investigation would provide some references to the practical application of the directly reversed axial flow pump station.

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